From 6009ce5ec283e59a8b0335777174cb490ab10949 Mon Sep 17 00:00:00 2001
From: gitea <znup@MacBook-Pro.lan>
Date: Sat, 14 Feb 2026 10:59:22 +0100
Subject: [PATCH] Deck version update

---
 src/lib/ConfirmModal.svelte                   |  10 +-
 src/lib/Navbar.svelte                         |  33 +-
 src/lib/RatingModal.svelte                    |  22 +-
 src/lib/api/decks.js                          | 132 ++++++-
 src/lib/stores/navContext.js                  |   4 +
 src/routes/Community.svelte                   |  54 ++-
 src/routes/CommunityUser.svelte               |  52 ++-
 src/routes/CreateDeck.svelte                  |   4 +
 src/routes/DeckPreview.svelte                 | 206 ++++++++--
 src/routes/EditDeck.svelte                    | 229 ++++++++++-
 src/routes/MyDecks.svelte                     | 366 ++++++++++++++++--
 src/routes/Settings.svelte                    |  11 +-
 .../20250214000000_deck_version.sql           |  13 +
 .../RUN_IF_NEEDED_deck_version_columns.sql    |   9 +
 14 files changed, 1005 insertions(+), 140 deletions(-)
 create mode 100644 src/lib/stores/navContext.js
 create mode 100644 supabase/migrations/20250214000000_deck_version.sql
 create mode 100644 supabase/migrations/RUN_IF_NEEDED_deck_version_columns.sql

diff --git a/src/lib/ConfirmModal.svelte b/src/lib/ConfirmModal.svelte
index 74cddc9..565562c 100644
--- a/src/lib/ConfirmModal.svelte
+++ b/src/lib/ConfirmModal.svelte
@@ -39,10 +39,18 @@
     aria-modal="true"
     aria-labelledby="confirm-modal-title"
     aria-describedby="confirm-modal-desc"
+    tabindex="-1"
     onclick={handleBackdropClick}
     onkeydown={handleKeydown}
   >
-    <div class="modal" onclick={(e) => e.stopPropagation()}>
+    <!-- svelte-ignore a11y_no_static_element_interactions -->
+    <div
+      class="modal"
+      role="document"
+      tabindex="-1"
+      onclick={(e) => e.stopPropagation()}
+      onkeydown={handleKeydown}
+    >
       <h2 id="confirm-modal-title" class="modal-title">{title}</h2>
       <p id="confirm-modal-desc" class="modal-message">{message}</p>
       <div class="modal-actions">
diff --git a/src/lib/Navbar.svelte b/src/lib/Navbar.svelte
index 1769b49..ee0b7b5 100644
--- a/src/lib/Navbar.svelte
+++ b/src/lib/Navbar.svelte
@@ -1,9 +1,14 @@
 <script>
   import { onMount, onDestroy } from 'svelte';
-  import { push } from 'svelte-spa-router';
+  import { push, location } from 'svelte-spa-router';
   import { auth } from './stores/auth.js';
+  import { navContext } from './stores/navContext.js';
   import { getProfile } from './api/profile.js';
 
+  $: loc = $location || '';
+  $: myDecksActive = loc === '/' || loc === '/decks/new' || /^\/decks\/[^/]+\/edit$/.test(loc) || $navContext === 'my-decks';
+  $: communityActive = loc === '/community' || loc.startsWith('/community/') || $navContext === 'community';
+
   let showPopup = false;
   let mode = 'login'; // 'login' | 'register'
   let email = '';
@@ -90,6 +95,19 @@
     userMenuOpen = false;
   }
 
+  /** Load profile (including avatar) when user is logged in, so avatar shows after refresh */
+  $: if (!$auth.loading && $auth.user?.id && !profile && !profileLoading) {
+    profileLoading = true;
+    getProfile($auth.user.id)
+      .then((p) => {
+        profile = p;
+        profileLoading = false;
+      })
+      .catch(() => {
+        profileLoading = false;
+      });
+  }
+
   function onProfileUpdated(e) {
     const p = e?.detail;
     if (p && p.id && $auth.user?.id && p.id === $auth.user.id) {
@@ -115,9 +133,9 @@
       <span class="app-name">Omotomo</span>
     </a>
     {#if $auth.user}
-      <a href="/" class="nav-link" onclick={(e) => { e.preventDefault(); push('/'); }}>My decks</a>
+      <a href="/" class="nav-link" class:active={myDecksActive} onclick={(e) => { e.preventDefault(); push('/'); }}>My decks</a>
     {/if}
-    <a href="/community" class="nav-link" onclick={(e) => { e.preventDefault(); push('/community'); }}>Community</a>
+    <a href="/community" class="nav-link" class:active={communityActive} onclick={(e) => { e.preventDefault(); push('/community'); }}>Community</a>
   </div>
   <div class="nav-actions">
     {#if $auth.user}
@@ -309,6 +327,11 @@
     color: var(--text-primary, #f0f0f0);
   }
 
+  .nav-link.active {
+    color: var(--text-primary, #f0f0f0);
+    font-weight: 500;
+  }
+
   .nav-actions {
     display: flex;
     align-items: center;
@@ -450,10 +473,6 @@
     border-color: #2563eb;
   }
 
-  .btn-logout {
-    background: transparent;
-  }
-
   .btn-block {
     width: 100%;
   }
diff --git a/src/lib/RatingModal.svelte b/src/lib/RatingModal.svelte
index 3680c72..a3ffce2 100644
--- a/src/lib/RatingModal.svelte
+++ b/src/lib/RatingModal.svelte
@@ -32,8 +32,24 @@
 </script>
 
 {#if deck}
-  <div class="modal-backdrop" role="dialog" aria-modal="true" aria-labelledby="rating-modal-title" onclick={handleBackdropClick}>
-    <div class="modal" onclick={(e) => e.stopPropagation()}>
+  <!-- svelte-ignore a11y_no_static_element_interactions -->
+  <div
+    class="modal-backdrop"
+    role="dialog"
+    aria-modal="true"
+    aria-labelledby="rating-modal-title"
+    tabindex="-1"
+    onclick={handleBackdropClick}
+    onkeydown={(e) => e.key === 'Escape' && onClose()}
+  >
+    <!-- svelte-ignore a11y_no_static_element_interactions -->
+    <div
+      class="modal"
+      role="document"
+      tabindex="-1"
+      onclick={(e) => e.stopPropagation()}
+      onkeydown={(e) => e.key === 'Escape' && onClose()}
+    >
       <h2 id="rating-modal-title" class="modal-title">Rate: {deck.title}</h2>
       <div class="stars-row">
         {#each [1, 2, 3, 4, 5] as n}
@@ -54,7 +70,7 @@
         placeholder="Add a comment…"
         bind:value={comment}
         rows="3"
-      />
+      ></textarea>
       <div class="modal-actions">
         <button type="button" class="btn btn-ghost" onclick={onClose}>Cancel</button>
         <button type="button" class="btn btn-primary" onclick={handleSubmit} disabled={selectedStars < 1}>
diff --git a/src/lib/api/decks.js b/src/lib/api/decks.js
index bd02896..fbbfe94 100644
--- a/src/lib/api/decks.js
+++ b/src/lib/api/decks.js
@@ -3,7 +3,7 @@ import { supabase } from '../supabase.js';
 export async function fetchMyDecks(userId) {
   const { data, error } = await supabase
     .from('decks')
-    .select('id, title, description, config, published, created_at, updated_at, copied_from_deck_id')
+    .select('id, title, description, config, published, created_at, updated_at, copied_from_deck_id, version, copied_from_version')
     .eq('owner_id', userId)
     .order('updated_at', { ascending: false });
   if (error) throw error;
@@ -29,7 +29,7 @@ export async function fetchMyDecks(userId) {
       ? supabase.from('deck_ratings').select('deck_id, rating').in('deck_id', ratingDeckIds)
       : Promise.resolve({ data: [] }),
     sourceDeckIds.length > 0
-      ? supabase.from('decks').select('id, title').in('id', sourceDeckIds)
+      ? supabase.from('decks').select('id, title, version, updated_at').in('id', sourceDeckIds)
       : Promise.resolve({ data: [] }),
   ]);
 
@@ -45,13 +45,23 @@ export async function fetchMyDecks(userId) {
     return { average_rating: Math.round((sum / arr.length) * 100) / 100, rating_count: arr.length };
   };
 
-  const sourceTitleById = new Map((sourceTitlesRows.data ?? []).map((d) => [d.id, d.title]));
+  const sourceById = new Map((sourceTitlesRows.data ?? []).map((d) => [d.id, d]));
 
   return decks.map((d, i) => {
     const showRatingDeckId = d.copied_from_deck_id || d.id;
     const rating = getRating(showRatingDeckId);
     const canRate = !!d.copied_from_deck_id;
-    const source_deck_title = d.copied_from_deck_id ? sourceTitleById.get(d.copied_from_deck_id) ?? 'Deck' : null;
+    const sourceDeck = d.copied_from_deck_id ? sourceById.get(d.copied_from_deck_id) : null;
+    const source_deck_title = sourceDeck?.title ?? 'Deck';
+    const source_version = sourceDeck?.version ?? 1;
+    const my_version = d.copied_from_version ?? 0;
+    const versionOutdated = source_version > my_version;
+    const sourceNewerByTime =
+      sourceDeck?.updated_at &&
+      d.updated_at &&
+      new Date(sourceDeck.updated_at).getTime() > new Date(d.updated_at).getTime();
+    const needs_update =
+      !!d.copied_from_deck_id && (versionOutdated || sourceNewerByTime);
     return {
       ...d,
       question_count: questionCounts[i],
@@ -59,6 +69,8 @@ export async function fetchMyDecks(userId) {
       can_rate: canRate,
       rateable_deck_id: d.copied_from_deck_id || null,
       source_deck_title,
+      source_version,
+      needs_update,
     };
   });
 }
@@ -269,10 +281,11 @@ export async function copyDeckToUser(deckId, userId) {
     config: source.config ?? {},
     questions,
     copiedFromDeckId: deckId,
+    copiedFromVersion: source.version ?? 1,
   });
 }
 
-export async function createDeck(ownerId, { title, description, config, questions, copiedFromDeckId }) {
+export async function createDeck(ownerId, { title, description, config, questions, copiedFromDeckId, copiedFromVersion }) {
   const row = {
     owner_id: ownerId,
     title: title.trim(),
@@ -280,6 +293,7 @@ export async function createDeck(ownerId, { title, description, config, question
     config: config ?? {},
   };
   if (copiedFromDeckId != null) row.copied_from_deck_id = copiedFromDeckId;
+  if (copiedFromVersion != null) row.copied_from_version = copiedFromVersion;
   const { data: deck, error: deckError } = await supabase
     .from('decks')
     .insert(row)
@@ -302,13 +316,23 @@ export async function createDeck(ownerId, { title, description, config, question
 }
 
 export async function updateDeck(deckId, { title, description, config, questions }) {
+  const { data: current, error: fetchErr } = await supabase
+    .from('decks')
+    .select('version, published')
+    .eq('id', deckId)
+    .single();
+  if (fetchErr) throw fetchErr;
+  const bumpVersion = current?.published === true;
+  const nextVersion = bumpVersion ? (current?.version ?? 1) + 1 : (current?.version ?? 1);
+  const updatePayload = {
+    title: title.trim(),
+    description: (description ?? '').trim(),
+    config: config ?? {},
+    version: nextVersion,
+  };
   const { error: deckError } = await supabase
     .from('decks')
-    .update({
-      title: title.trim(),
-      description: (description ?? '').trim(),
-      config: config ?? {},
-    })
+    .update(updatePayload)
     .eq('id', deckId);
   if (deckError) throw deckError;
   const { error: delError } = await supabase.from('questions').delete().eq('deck_id', deckId);
@@ -337,6 +361,94 @@ export async function deleteDeck(deckId) {
   if (error) throw error;
 }
 
+/**
+ * Get source deck and copy deck with questions for the "Update from community" preview.
+ * Copy must be owned by userId and have copied_from_deck_id.
+ * @returns {{ source: object, copy: object, changes: string[] }}
+ */
+export async function getSourceUpdatePreview(copyDeckId, userId) {
+  const { data: copy, error: copyErr } = await supabase
+    .from('decks')
+    .select('*')
+    .eq('id', copyDeckId)
+    .eq('owner_id', userId)
+    .single();
+  if (copyErr || !copy?.copied_from_deck_id) throw new Error('Deck not found or not a copy');
+  const sourceId = copy.copied_from_deck_id;
+  const [source, copyQuestionsRows] = await Promise.all([
+    fetchDeckWithQuestions(sourceId),
+    supabase.from('questions').select('*').eq('deck_id', copyDeckId).order('sort_order', { ascending: true }),
+  ]);
+  if (!source.published) throw new Error('Source deck is no longer available');
+  const copyQuestions = copyQuestionsRows.data ?? [];
+  const copyWithQuestions = { ...copy, questions: copyQuestions };
+
+  const changes = [];
+  if ((source.title ?? '').trim() !== (copy.title ?? '').trim()) {
+    changes.push(`Title: "${(copy.title ?? '').trim()}" → "${(source.title ?? '').trim()}"`);
+  }
+  if ((source.description ?? '').trim() !== (copy.description ?? '').trim()) {
+    changes.push('Description updated');
+  }
+  const srcLen = (source.questions ?? []).length;
+  const copyLen = copyQuestions.length;
+  if (srcLen !== copyLen) {
+    changes.push(`Questions: ${copyLen} → ${srcLen}`);
+  } else {
+    const anyDifferent = (source.questions ?? []).some((sq, i) => {
+      const cq = copyQuestions[i];
+      if (!cq) return true;
+      return (sq.prompt ?? '') !== (cq.prompt ?? '') || (sq.explanation ?? '') !== (cq.explanation ?? '');
+    });
+    if (anyDifferent) changes.push('Some question content updated');
+  }
+  if (changes.length === 0) changes.push('Content is in sync (version metadata will update)');
+
+  return { source, copy: copyWithQuestions, changes };
+}
+
+/**
+ * Update a community copy to match the current source deck (title, description, config, questions, copied_from_version).
+ */
+export async function applySourceUpdate(copyDeckId, userId) {
+  const { data: copy, error: copyErr } = await supabase
+    .from('decks')
+    .select('id, copied_from_deck_id')
+    .eq('id', copyDeckId)
+    .eq('owner_id', userId)
+    .single();
+  if (copyErr || !copy?.copied_from_deck_id) throw new Error('Deck not found or not a copy');
+  const source = await fetchDeckWithQuestions(copy.copied_from_deck_id);
+  if (!source.published) throw new Error('Source deck is no longer available');
+
+  const { error: deckError } = await supabase
+    .from('decks')
+    .update({
+      title: source.title ?? '',
+      description: source.description ?? '',
+      config: source.config ?? {},
+      copied_from_version: source.version ?? 1,
+    })
+    .eq('id', copyDeckId);
+  if (deckError) throw deckError;
+
+  const { error: delError } = await supabase.from('questions').delete().eq('deck_id', copyDeckId);
+  if (delError) throw delError;
+  const questions = source.questions ?? [];
+  if (questions.length > 0) {
+    const rows = questions.map((q, i) => ({
+      deck_id: copyDeckId,
+      sort_order: i,
+      prompt: (q.prompt ?? '').trim(),
+      explanation: (q.explanation ?? '').trim() || null,
+      answers: Array.isArray(q.answers) ? q.answers : [],
+      correct_answer_indices: Array.isArray(q.correct_answer_indices) ? q.correct_answer_indices : [],
+    }));
+    const { error: qError } = await supabase.from('questions').insert(rows);
+    if (qError) throw qError;
+  }
+}
+
 /** True if the user already has this deck (owns it or has added a copy). */
 export async function userHasDeck(deckId, userId) {
   if (!userId) return false;
diff --git a/src/lib/stores/navContext.js b/src/lib/stores/navContext.js
new file mode 100644
index 0000000..ca53563
--- /dev/null
+++ b/src/lib/stores/navContext.js
@@ -0,0 +1,4 @@
+import { writable } from 'svelte/store';
+
+/** 'my-decks' | 'community' | null - used by Navbar to highlight the correct menu item. */
+export const navContext = writable(null);
diff --git a/src/routes/Community.svelte b/src/routes/Community.svelte
index 988fdf6..f13fe18 100644
--- a/src/routes/Community.svelte
+++ b/src/routes/Community.svelte
@@ -2,6 +2,7 @@
   import { onMount } from 'svelte';
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
+  import { navContext } from '../lib/stores/navContext.js';
   import { fetchPublishedDecks, copyDeckToUser, getMyDeckRating, submitDeckRating } from '../lib/api/decks.js';
   import RatingModal from '../lib/RatingModal.svelte';
 
@@ -59,7 +60,10 @@
     return list;
   })();
 
-  onMount(load);
+  onMount(() => {
+    navContext.set('community');
+    load();
+  });
 
   function formatRating(n) {
     return Number(n).toFixed(1);
@@ -182,6 +186,7 @@
       <ul class="deck-grid">
         {#each filteredDecks as deck (deck.id)}
         <li class="deck-card">
+          <!-- svelte-ignore a11y_no_noninteractive_tabindex -->
           <div class="deck-card-inner" role="button" tabindex="0" onclick={() => goPreview(deck.id)} onkeydown={(e) => e.key === 'Enter' && goPreview(deck.id)}>
             <h3 class="deck-title">{deck.title}</h3>
             {#if deck.description}
@@ -193,21 +198,29 @@
             <div class="deck-creator">
               By <a href="/community/user/{deck.owner_id}" class="creator-link" onclick={(e) => { e.stopPropagation(); goUser(deck.owner_id, e); }}>{deck.owner_display_name ?? deck.owner_email ?? 'User'}</a>
             </div>
-            <div
-              class="deck-rating"
-              class:clickable={userId && deck.owner_id !== userId}
-              aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
-              onclick={userId && deck.owner_id !== userId ? (e) => openRatingModal(deck, e) : undefined}
-              role={userId && deck.owner_id !== userId ? 'button' : undefined}
-              tabindex={userId && deck.owner_id !== userId ? 0 : undefined}
-              onkeydown={userId && deck.owner_id !== userId ? (e) => e.key === 'Enter' && openRatingModal(deck, e) : undefined}
-            >
-              <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
-              <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
-              {#if (deck.rating_count ?? 0) > 0}
-                <span class="rating-count">({deck.rating_count})</span>
-              {/if}
-            </div>
+            {#if userId && deck.owner_id !== userId}
+              <button
+                type="button"
+                class="deck-rating clickable"
+                aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
+                onclick={(e) => openRatingModal(deck, e)}
+                onkeydown={(e) => e.key === 'Enter' && openRatingModal(deck, e)}
+              >
+                <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                {#if (deck.rating_count ?? 0) > 0}
+                  <span class="rating-count">({deck.rating_count})</span>
+                {/if}
+              </button>
+            {:else}
+              <div class="deck-rating" aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars">
+                <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                {#if (deck.rating_count ?? 0) > 0}
+                  <span class="rating-count">({deck.rating_count})</span>
+                {/if}
+              </div>
+            {/if}
             <div class="deck-card-actions">
               {#if !deck.user_has_this}
                 <button type="button" class="btn btn-small btn-primary" onclick={(e) => { e.stopPropagation(); handleUse(deck.id); }} disabled={addingDeckId === deck.id}>
@@ -428,6 +441,15 @@
     font-size: 0.9rem;
     color: var(--text-muted, #a0a0a0);
     margin-bottom: 0.25rem;
+    border: none;
+    background: transparent;
+    padding: 0;
+    font: inherit;
+    text-align: left;
+  }
+
+  button.deck-rating {
+    cursor: pointer;
   }
 
   .deck-rating.clickable {
diff --git a/src/routes/CommunityUser.svelte b/src/routes/CommunityUser.svelte
index 678fb7c..30739e1 100644
--- a/src/routes/CommunityUser.svelte
+++ b/src/routes/CommunityUser.svelte
@@ -1,9 +1,13 @@
 <script>
+  import { onMount } from 'svelte';
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
+  import { navContext } from '../lib/stores/navContext.js';
   import { fetchPublishedDecksByOwner, copyDeckToUser, getMyDeckRating, submitDeckRating } from '../lib/api/decks.js';
   import RatingModal from '../lib/RatingModal.svelte';
 
+  onMount(() => navContext.set('community'));
+
   export let params = {};
 
   let decks = [];
@@ -123,6 +127,7 @@
     <ul class="deck-grid">
       {#each decks as deck (deck.id)}
         <li class="deck-card">
+          <!-- svelte-ignore a11y_no_noninteractive_tabindex -->
           <div class="deck-card-inner" role="button" tabindex="0" onclick={() => goPreview(deck.id)} onkeydown={(e) => e.key === 'Enter' && goPreview(deck.id)}>
             <h3 class="deck-title">{deck.title}</h3>
             {#if deck.description}
@@ -131,21 +136,29 @@
             <div class="deck-meta">
               <span class="deck-count">{deck.question_count ?? 0} questions</span>
             </div>
-            <div
-              class="deck-rating"
-              class:clickable={userId && deck.owner_id !== userId}
-              aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
-              onclick={userId && deck.owner_id !== userId ? (e) => openRatingModal(deck, e) : undefined}
-              role={userId && deck.owner_id !== userId ? 'button' : undefined}
-              tabindex={userId && deck.owner_id !== userId ? 0 : undefined}
-              onkeydown={userId && deck.owner_id !== userId ? (e) => e.key === 'Enter' && openRatingModal(deck, e) : undefined}
-            >
-              <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
-              <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
-              {#if (deck.rating_count ?? 0) > 0}
-                <span class="rating-count">({deck.rating_count})</span>
-              {/if}
-            </div>
+            {#if userId && deck.owner_id !== userId}
+              <button
+                type="button"
+                class="deck-rating clickable"
+                aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
+                onclick={(e) => openRatingModal(deck, e)}
+                onkeydown={(e) => e.key === 'Enter' && openRatingModal(deck, e)}
+              >
+                <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                {#if (deck.rating_count ?? 0) > 0}
+                  <span class="rating-count">({deck.rating_count})</span>
+                {/if}
+              </button>
+            {:else}
+              <div class="deck-rating" aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars">
+                <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                {#if (deck.rating_count ?? 0) > 0}
+                  <span class="rating-count">({deck.rating_count})</span>
+                {/if}
+              </div>
+            {/if}
             <div class="deck-card-actions">
               {#if !deck.user_has_this}
                 <button type="button" class="btn btn-small btn-primary" onclick={(e) => { e.stopPropagation(); handleUse(deck.id); }} disabled={addingDeckId === deck.id}>
@@ -291,6 +304,15 @@
     font-size: 0.9rem;
     color: var(--text-muted, #a0a0a0);
     margin-bottom: 0.25rem;
+    border: none;
+    background: transparent;
+    padding: 0;
+    font: inherit;
+    text-align: left;
+  }
+
+  button.deck-rating {
+    cursor: pointer;
   }
 
   .deck-rating.clickable {
diff --git a/src/routes/CreateDeck.svelte b/src/routes/CreateDeck.svelte
index 980d369..d2e1c43 100644
--- a/src/routes/CreateDeck.svelte
+++ b/src/routes/CreateDeck.svelte
@@ -1,10 +1,14 @@
 <script>
+  import { onMount } from 'svelte';
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
+  import { navContext } from '../lib/stores/navContext.js';
   import { createDeck } from '../lib/api/decks.js';
   import { DEFAULT_DECK_CONFIG } from '../lib/deckConfig.js';
   import QuestionEditor from '../lib/QuestionEditor.svelte';
 
+  onMount(() => navContext.set('my-decks'));
+
   let title = '';
   let description = '';
   let config = { ...DEFAULT_DECK_CONFIG };
diff --git a/src/routes/DeckPreview.svelte b/src/routes/DeckPreview.svelte
index 1e7916d..340850c 100644
--- a/src/routes/DeckPreview.svelte
+++ b/src/routes/DeckPreview.svelte
@@ -1,6 +1,7 @@
 <script>
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
+  import { navContext } from '../lib/stores/navContext.js';
   import { fetchDeckWithQuestions, copyDeckToUser, userHasDeck } from '../lib/api/decks.js';
 
   export let params = {};
@@ -28,22 +29,43 @@
     userAlreadyHasDeck = false;
     try {
       deck = await fetchDeckWithQuestions(deckId);
-      if (!deck.published) {
+      const isMyCopy = !!(userId && deck.owner_id === userId && deck.copied_from_deck_id);
+      const isOwnDeckLoad = !!(userId && deck.owner_id === userId && !deck.copied_from_deck_id);
+      const canView = deck.published || isMyCopy || isOwnDeckLoad;
+      if (!canView) {
         error = 'This deck is not available.';
         deck = null;
-      } else if (userId) {
-        userAlreadyHasDeck = await userHasDeck(deckId, userId);
+      } else {
+        navContext.set(isMyCopy || isOwnDeckLoad ? 'my-decks' : 'community');
+        if (isMyCopy) {
+          userAlreadyHasDeck = true;
+        } else if (userId) {
+          userAlreadyHasDeck = await userHasDeck(deckId, userId);
+        }
       }
     } catch (e) {
       error = e?.message ?? 'Failed to load deck';
       deck = null;
+      navContext.set(null);
     } finally {
       loading = false;
     }
   }
 
-  function goCommunity() {
-    push('/community');
+  $: isMyCopy = !!(deck && userId && deck.owner_id === userId && deck.copied_from_deck_id);
+  $: isOwnDeck = !!(deck && userId && deck.owner_id === userId && !deck.copied_from_deck_id);
+  /** Only show "In My decks" when viewing from Community and user already has this deck */
+  $: showInMyDecksLabel = !!(deck && !isMyCopy && !isOwnDeck && userAlreadyHasDeck);
+
+  function goBack() {
+    if (loading) {
+      if (typeof window !== 'undefined' && window.history.length > 1) window.history.back();
+      else push('/community');
+    } else if (isMyCopy || isOwnDeck) {
+      push('/');
+    } else {
+      push('/community');
+    }
   }
 
   async function addToMyDecks() {
@@ -65,39 +87,63 @@
   }
 
   function goReviews() {
-    if (!deckId) return;
-    push(`/decks/${deckId}/reviews`);
+    if (!deck) return;
+    const reviewsDeckId = isMyCopy ? deck.copied_from_deck_id : deck.id;
+    if (reviewsDeckId) push(`/decks/${reviewsDeckId}/reviews`);
+  }
+
+  function goEdit() {
+    if (deck?.id) push(`/decks/${deck.id}/edit`);
   }
 </script>
 
 <header class="page-header page-header-fixed">
   <div class="page-header-inner">
-    <div class="page-header-actions">
-      <button type="button" class="btn btn-back" onclick={goCommunity}>← Community</button>
-      {#if deck && deck.published && !userAlreadyHasDeck}
-        <button
-          type="button"
-          class="btn btn-add"
-          onclick={addToMyDecks}
-          disabled={adding}
-          title="Add to my decks"
-        >
-          {#if adding}
-            Adding…
+    <div class="header-top-row">
+      <h1 class="page-header-title">Preview</h1>
+      <div class="page-header-actions">
+        <button type="button" class="btn btn-back" onclick={goBack}>
+          {#if loading}
+            ← Back
+          {:else if isMyCopy || isOwnDeck}
+            ← My decks
           {:else}
-            Add to my decks
+            ← Community
           {/if}
         </button>
-      {:else if deck && deck.published && userAlreadyHasDeck}
-        <span class="already-have">In My decks</span>
-      {/if}
-      {#if deck && deck.published}
-        <button type="button" class="btn btn-reviews" onclick={goReviews} title="View reviews">
-          Reviews
-        </button>
-      {/if}
+        {#if loading}
+          <span class="header-spinner" aria-hidden="true"></span>
+        {:else if deck && (deck.published || isMyCopy || isOwnDeck)}
+          {#if isOwnDeck}
+            <button type="button" class="btn btn-edit" onclick={goEdit} title="Edit deck">
+              Edit
+            </button>
+          {/if}
+          {#if !userAlreadyHasDeck}
+            <button
+              type="button"
+              class="btn btn-add"
+              onclick={addToMyDecks}
+              disabled={adding}
+              title="Add to my decks"
+            >
+              {#if adding}
+                Adding…
+              {:else}
+                Add to my decks
+              {/if}
+            </button>
+          {/if}
+          <button type="button" class="btn btn-reviews" onclick={goReviews} title="View reviews">
+            Reviews
+          </button>
+        {/if}
+      </div>
     </div>
-    {#if deck && deck.published && !userAlreadyHasDeck && addError}
+    {#if showInMyDecksLabel}
+      <p class="header-in-my-decks">In My decks</p>
+    {/if}
+    {#if deck && (deck.published || isMyCopy || isOwnDeck) && !userAlreadyHasDeck && addError}
       <p class="page-header-error">{addError}</p>
     {/if}
   </div>
@@ -105,7 +151,10 @@
 
 <div class="page page-with-fixed-header">
   {#if loading}
-    <p class="muted">Loading…</p>
+    <div class="loading-state" aria-busy="true" aria-live="polite">
+      <span class="loading-spinner" aria-hidden="true"></span>
+      <p class="loading-text">Loading deck…</p>
+    </div>
   {:else if error}
     <p class="error">{error}</p>
   {:else if deck}
@@ -165,15 +214,55 @@
     max-width: 700px;
     margin: 0 auto;
     padding: 0.75rem 1.5rem;
+    display: flex;
+    flex-direction: column;
+    gap: 0.25rem;
+  }
+
+  .header-top-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 1rem;
+    flex-wrap: wrap;
+  }
+
+  .page-header-title {
+    margin: 0;
+    font-size: 1.25rem;
+    font-weight: 600;
+    color: var(--text-primary, #f0f0f0);
+  }
+
+  .header-in-my-decks {
+    margin: 0;
+    font-size: 0.9rem;
+    color: #22c55e;
+    font-style: italic;
   }
 
   .page-header-actions {
     display: flex;
     flex-wrap: wrap;
     align-items: center;
+    justify-content: flex-end;
     gap: 0.75rem;
   }
 
+  .header-spinner {
+    display: inline-block;
+    width: 1.25rem;
+    height: 1.25rem;
+    border: 2px solid var(--border, #333);
+    border-top-color: var(--accent, #3b82f6);
+    border-radius: 50%;
+    animation: header-spin 0.7s linear infinite;
+  }
+
+  @keyframes header-spin {
+    to { transform: rotate(360deg); }
+  }
+
   .btn-back {
     padding: 0.4rem 0.75rem;
     font-size: 0.9rem;
@@ -225,18 +314,29 @@
     border-color: var(--border-hover, #444);
   }
 
+  .btn-edit {
+    padding: 0.4rem 1rem;
+    font-size: 0.9rem;
+    font-weight: 500;
+    border: 1px solid var(--border, #333);
+    border-radius: 6px;
+    background: transparent;
+    color: var(--text-muted, #a0a0a0);
+    cursor: pointer;
+  }
+
+  .btn-edit:hover {
+    color: var(--text-primary, #f0f0f0);
+    border-color: var(--border-hover, #444);
+  }
+
   .page-header-error {
+    width: 100%;
     margin: 0.5rem 0 0 0;
     font-size: 0.85rem;
     color: #ef4444;
   }
 
-  .already-have {
-    font-size: 0.9rem;
-    color: #22c55e;
-    font-style: italic;
-  }
-
   .deck-title {
     margin: 0 0 0.5rem 0;
     font-size: 1.5rem;
@@ -303,16 +403,38 @@
     font-style: italic;
   }
 
-  .muted,
-  .error {
-    margin: 0;
+  .loading-state {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 1rem;
+    min-height: 12rem;
+    padding: 2rem;
   }
 
-  .error {
-    color: #ef4444;
+  .loading-spinner {
+    display: block;
+    width: 2.5rem;
+    height: 2.5rem;
+    border: 3px solid var(--border, #333);
+    border-top-color: var(--accent, #3b82f6);
+    border-radius: 50%;
+    animation: loading-spin 0.8s linear infinite;
+  }
+
+  @keyframes loading-spin {
+    to { transform: rotate(360deg); }
   }
 
-  .muted {
+  .loading-text {
+    margin: 0;
+    font-size: 0.95rem;
     color: var(--text-muted, #a0a0a0);
   }
+
+  .error {
+    margin: 0;
+    color: #ef4444;
+  }
 </style>
diff --git a/src/routes/EditDeck.svelte b/src/routes/EditDeck.svelte
index 5ad10b1..13c3a47 100644
--- a/src/routes/EditDeck.svelte
+++ b/src/routes/EditDeck.svelte
@@ -1,11 +1,17 @@
 <script>
+  import { onMount } from 'svelte';
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
+  import { navContext } from '../lib/stores/navContext.js';
   import { fetchDeckWithQuestions, updateDeck, togglePublished, deleteDeck } from '../lib/api/decks.js';
   import { DEFAULT_DECK_CONFIG } from '../lib/deckConfig.js';
   import QuestionEditor from '../lib/QuestionEditor.svelte';
   import ConfirmModal from '../lib/ConfirmModal.svelte';
 
+  onMount(() => {
+    navContext.set('my-decks');
+  });
+
   export let params = {};
   $: deckId = params?.id;
 
@@ -18,8 +24,13 @@
   let saving = false;
   let error = null;
   let showDeleteConfirm = false;
+  let showJsonModal = false;
+  let jsonEditText = '';
+  let jsonModalError = null;
   let isCopiedDeck = false;
 
+  const CONFIG_KEYS = Object.keys(DEFAULT_DECK_CONFIG);
+
   $: userId = $auth.user?.id;
 
   let prevDeckId = '';
@@ -148,17 +159,59 @@
   function cancel() {
     push('/');
   }
+
+  function openJsonModal() {
+    jsonEditText = getDeckJson();
+    jsonModalError = null;
+    showJsonModal = true;
+  }
+
+  function closeJsonModal() {
+    showJsonModal = false;
+  }
+
+  function getDeckJson() {
+    const normalized = questions.map(normalizeQuestion).filter(Boolean);
+    const payload = {
+      title: title.trim(),
+      description: description.trim(),
+      config: { ...config },
+      questions: normalized,
+    };
+    return JSON.stringify(payload, null, 2);
+  }
+
+  async function copyJsonToClipboard() {
+    try {
+      await navigator.clipboard.writeText(getDeckJson());
+      closeJsonModal();
+    } catch (_) {}
+  }
 </script>
 
 <header class="page-header page-header-fixed">
   <div class="page-header-inner">
     <h1 class="page-header-title">Edit deck</h1>
     <div class="header-actions">
-      <button type="button" class="btn btn-danger" onclick={openDeleteConfirm} disabled={saving}>Delete</button>
-      <button type="button" class="btn btn-secondary" onclick={cancel} disabled={saving}>Cancel</button>
-      <button type="button" class="btn btn-primary" onclick={save} disabled={saving}>
-        {saving ? 'Saving…' : 'Save'}
-      </button>
+      {#if loading}
+        <span class="header-spinner" aria-hidden="true"></span>
+      {:else}
+        <button type="button" class="btn btn-secondary btn-icon-text" onclick={openJsonModal} disabled={saving} title="See JSON">
+          <span class="btn-icon-svg" aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M8 3H7a2 2 0 0 0-2 2v5a2 2 0 0 1-2 2 2 2 0 0 1 2 2v5a2 2 0 0 0 2 2h1"/><path d="M16 21h1a2 2 0 0 0 2-2v-5a2 2 0 0 1 2-2 2 2 0 0 1-2-2V5a2 2 0 0 0-2-2h-1"/></svg></span>
+          See JSON
+        </button>
+        <button type="button" class="btn btn-secondary btn-icon-text" onclick={cancel} disabled={saving} title="Cancel">
+          <span class="btn-icon-svg" aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M19 12H5"/><path d="m12 19-7-7 7-7"/></svg></span>
+          Cancel
+        </button>
+        <button type="button" class="btn btn-primary btn-icon-text" onclick={save} disabled={saving} title={saving ? 'Saving…' : 'Save'}>
+          <span class="btn-icon-svg" aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M19 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11l5 5v11a2 2 0 0 1-2 2z"/><polyline points="17 21 17 13 7 13 7 21"/><polyline points="7 3 7 8 15 8"/></svg></span>
+          {saving ? 'Saving…' : 'Save'}
+        </button>
+        <button type="button" class="btn btn-danger btn-icon-only" onclick={openDeleteConfirm} disabled={saving} title="Delete deck" aria-label="Delete deck">
+          <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M3 6h18"/><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"/><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"/><line x1="10" y1="11" x2="10" y2="17"/><line x1="14" y1="11" x2="14" y2="17"/></svg>
+        </button>
+      {/if}
     </div>
   </div>
 </header>
@@ -169,7 +222,10 @@
   {:else if !userId}
     <p class="auth-required">Sign in to edit decks.</p>
   {:else if loading}
-    <p class="muted">Loading…</p>
+    <div class="loading-state" aria-busy="true" aria-live="polite">
+      <span class="loading-spinner" aria-hidden="true"></span>
+      <p class="loading-text">Loading deck…</p>
+    </div>
   {:else}
     <form class="deck-form" onsubmit={(e) => { e.preventDefault(); save(); }}>
       {#if !isCopiedDeck}
@@ -201,6 +257,38 @@
     </form>
   {/if}
 
+  {#if showJsonModal}
+    <!-- svelte-ignore a11y_no_noninteractive_element_interactions -->
+    <div
+      class="json-modal-backdrop"
+      role="dialog"
+      aria-modal="true"
+      aria-label="Deck JSON"
+      tabindex="-1"
+      onclick={(e) => e.target === e.currentTarget && closeJsonModal()}
+      onkeydown={(e) => e.key === 'Escape' && closeJsonModal()}
+    >
+      <div
+        class="json-modal"
+        role="document"
+        tabindex="-1"
+        onclick={(e) => e.stopPropagation()}
+        onkeydown={(e) => e.key === 'Escape' && closeJsonModal()}
+      >
+        <h2 class="json-modal-title">Deck JSON</h2>
+        <textarea class="json-modal-textarea" bind:value={jsonEditText} spellcheck="false" aria-label="Edit deck JSON"></textarea>
+        {#if jsonModalError}
+          <p class="json-modal-error">{jsonModalError}</p>
+        {/if}
+        <div class="json-modal-actions">
+          <button type="button" class="btn btn-secondary" onclick={closeJsonModal}>Close</button>
+          <button type="button" class="btn btn-secondary" onclick={copyJsonToClipboard}>Copy</button>
+          <button type="button" class="btn btn-primary" onclick={applyJsonFromModal}>Apply</button>
+        </div>
+      </div>
+    </div>
+  {/if}
+
   <ConfirmModal
     open={showDeleteConfirm}
     title="Delete deck"
@@ -260,6 +348,37 @@
   .header-actions {
     display: flex;
     gap: 0.5rem;
+    align-items: center;
+    flex-wrap: wrap;
+  }
+
+  .btn-icon-text {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.35rem;
+  }
+
+  .btn-icon-text .btn-icon-svg {
+    display: inline-flex;
+  }
+
+  .btn-icon-only {
+    padding: 0.5rem;
+    margin-left: auto;
+  }
+
+  .header-spinner {
+    display: inline-block;
+    width: 1.25rem;
+    height: 1.25rem;
+    border: 2px solid var(--border, #333);
+    border-top-color: var(--accent, #3b82f6);
+    border-radius: 50%;
+    animation: header-spin 0.7s linear infinite;
+  }
+
+  @keyframes header-spin {
+    to { transform: rotate(360deg); }
   }
 
   .publish-row {
@@ -341,6 +460,104 @@
     border-color: var(--border-hover, #444);
   }
 
+  .json-modal-backdrop {
+    position: fixed;
+    inset: 0;
+    z-index: 100;
+    background: rgba(0, 0, 0, 0.6);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 1rem;
+  }
+
+  .json-modal {
+    background: var(--card-bg, #1e1e1e);
+    border: 1px solid var(--border, #333);
+    border-radius: 8px;
+    width: 94vw;
+    max-width: 94vw;
+    height: 90vh;
+    max-height: 90vh;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+  }
+
+  .json-modal-title {
+    margin: 0;
+    padding: 1rem 1.25rem;
+    font-size: 1.1rem;
+    font-weight: 600;
+    color: var(--text-primary, #f0f0f0);
+    border-bottom: 1px solid var(--border, #333);
+  }
+
+  .json-modal-textarea {
+    margin: 0;
+    padding: 1rem 1.25rem;
+    width: 100%;
+    min-height: 280px;
+    font-family: ui-monospace, monospace;
+    font-size: 0.85rem;
+    color: var(--text-primary, #f0f0f0);
+    background: var(--card-bg, #1e1e1e);
+    border: 1px solid var(--border, #333);
+    border-radius: 6px;
+    resize: vertical;
+    flex: 1;
+    box-sizing: border-box;
+  }
+
+  .json-modal-textarea:focus {
+    outline: none;
+    border-color: var(--accent, #3b82f6);
+  }
+
+  .json-modal-error {
+    margin: 0 1.25rem;
+    font-size: 0.85rem;
+    color: #ef4444;
+  }
+
+  .json-modal-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 0.5rem;
+    padding: 1rem 1.25rem;
+    border-top: 1px solid var(--border, #333);
+  }
+
+  .loading-state {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 1rem;
+    min-height: 12rem;
+    padding: 2rem;
+  }
+
+  .loading-spinner {
+    display: block;
+    width: 2.5rem;
+    height: 2.5rem;
+    border: 3px solid var(--border, #333);
+    border-top-color: var(--accent, #3b82f6);
+    border-radius: 50%;
+    animation: loading-spin 0.8s linear infinite;
+  }
+
+  @keyframes loading-spin {
+    to { transform: rotate(360deg); }
+  }
+
+  .loading-text {
+    margin: 0;
+    font-size: 0.95rem;
+    color: var(--text-muted, #a0a0a0);
+  }
+
   .error {
     margin: 0 0 1rem 0;
     font-size: 0.9rem;
diff --git a/src/routes/MyDecks.svelte b/src/routes/MyDecks.svelte
index 93aef0b..0493b25 100644
--- a/src/routes/MyDecks.svelte
+++ b/src/routes/MyDecks.svelte
@@ -1,10 +1,16 @@
 <script>
+  import { onMount } from 'svelte';
   import { push } from 'svelte-spa-router';
   import { auth } from '../lib/stores/auth.js';
-  import { fetchMyDecks, togglePublished, getMyDeckRating, submitDeckRating } from '../lib/api/decks.js';
+  import { navContext } from '../lib/stores/navContext.js';
+  import { fetchMyDecks, togglePublished, getMyDeckRating, submitDeckRating, getSourceUpdatePreview, applySourceUpdate, deleteDeck } from '../lib/api/decks.js';
   import RatingModal from '../lib/RatingModal.svelte';
   import ConfirmModal from '../lib/ConfirmModal.svelte';
 
+  onMount(() => {
+    navContext.set('my-decks');
+  });
+
   let decks = [];
   let loading = true;
   let error = null;
@@ -12,6 +18,14 @@
   let ratingInitial = { rating: 0, comment: '' };
   let showUnpublishConfirm = false;
   let deckToUnpublish = null;
+  let showUpdateModal = false;
+  let updateDeck = null;
+  let updatePreview = null;
+  let updateLoading = false;
+  let updateError = null;
+  let updateApplying = false;
+  let showRemoveConfirm = false;
+  let deckToRemove = null;
 
   $: userId = $auth.user?.id;
 
@@ -70,6 +84,10 @@
     push(`/decks/${id}/edit`);
   }
 
+  function goPreview(deck) {
+    push(`/decks/${deck.id}/preview`);
+  }
+
   let togglingId = null;
   async function handlePublish(e, deck) {
     e.stopPropagation();
@@ -112,6 +130,72 @@
       togglingId = null;
     }
   }
+
+  async function openUpdateModal(deck, e) {
+    e?.stopPropagation();
+    e?.preventDefault();
+    if (!deck?.needs_update || !userId) return;
+    updateDeck = deck;
+    showUpdateModal = true;
+    updatePreview = null;
+    updateError = null;
+    updateLoading = true;
+    try {
+      updatePreview = await getSourceUpdatePreview(deck.id, userId);
+    } catch (err) {
+      updateError = err?.message ?? 'Failed to load update preview';
+    } finally {
+      updateLoading = false;
+    }
+  }
+
+  function closeUpdateModal() {
+    showUpdateModal = false;
+    updateDeck = null;
+    updatePreview = null;
+    updateError = null;
+    updateApplying = false;
+  }
+
+  async function confirmSourceUpdate() {
+    if (!updateDeck || !userId) return;
+    updateApplying = true;
+    updateError = null;
+    try {
+      await applySourceUpdate(updateDeck.id, userId);
+      await load();
+      closeUpdateModal();
+    } catch (err) {
+      updateError = err?.message ?? 'Failed to update deck';
+    } finally {
+      updateApplying = false;
+    }
+  }
+
+  function openRemoveConfirm(deck, e) {
+    e?.stopPropagation();
+    e?.preventDefault();
+    if (!deck?.copied_from_deck_id) return;
+    deckToRemove = deck;
+    showRemoveConfirm = true;
+  }
+
+  function closeRemoveConfirm() {
+    showRemoveConfirm = false;
+    deckToRemove = null;
+  }
+
+  async function confirmRemoveFromMyDecks() {
+    if (!deckToRemove) return;
+    const deck = deckToRemove;
+    closeRemoveConfirm();
+    try {
+      await deleteDeck(deck.id);
+      await load();
+    } catch (err) {
+      error = err?.message ?? 'Failed to remove deck';
+    }
+  }
 </script>
 
 <div class="page">
@@ -133,10 +217,11 @@
     <ul class="deck-grid">
       {#each decks as deck (deck.id)}
         <li class="deck-card">
+          <!-- svelte-ignore a11y_no_noninteractive_tabindex -->
           <div
             class="deck-card-inner"
-            onclick={() => goEdit(deck.id)}
-            onkeydown={(e) => e.key === 'Enter' && goEdit(deck.id)}
+            onclick={() => goPreview(deck)}
+            onkeydown={(e) => e.key === 'Enter' && goPreview(deck)}
             role="button"
             tabindex="0"
           >
@@ -148,23 +233,50 @@
               <span class="deck-count">{deck.question_count ?? 0} questions</span>
             </div>
             {#if (deck.average_rating ?? 0) > 0 || (deck.rating_count ?? 0) > 0 || deck.can_rate}
-              <div
-                class="deck-rating"
-                class:clickable={deck.can_rate}
-                aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
-                onclick={deck.can_rate ? (e) => openRatingModal(deck, e) : undefined}
-                role={deck.can_rate ? 'button' : undefined}
-                tabindex={deck.can_rate ? 0 : undefined}
-                onkeydown={deck.can_rate ? (e) => e.key === 'Enter' && openRatingModal(deck, e) : undefined}
-              >
-                <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
-                <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
-                {#if (deck.rating_count ?? 0) > 0}
-                  <span class="rating-count">({deck.rating_count})</span>
-                {/if}
-              </div>
+              {#if deck.can_rate}
+                <button
+                  type="button"
+                  class="deck-rating clickable"
+                  aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars"
+                  onclick={(e) => openRatingModal(deck, e)}
+                  onkeydown={(e) => e.key === 'Enter' && openRatingModal(deck, e)}
+                >
+                  <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                  <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                  {#if (deck.rating_count ?? 0) > 0}
+                    <span class="rating-count">({deck.rating_count})</span>
+                  {/if}
+                </button>
+              {:else}
+                <div class="deck-rating" aria-label="Rating: {deck.average_rating ?? 0} out of 5 stars">
+                  <span class="stars">{['★', '★', '★', '★', '★'].map((_, i) => (i < Math.round(deck.average_rating ?? 0) ? '★' : '☆')).join('')}</span>
+                  <span class="rating-text">{formatRating(deck.average_rating ?? 0)}</span>
+                  {#if (deck.rating_count ?? 0) > 0}
+                    <span class="rating-count">({deck.rating_count})</span>
+                  {/if}
+                </div>
+              {/if}
             {/if}
             <div class="deck-card-actions">
+              {#if deck.needs_update}
+                <button
+                  type="button"
+                  class="btn btn-icon btn-icon-update"
+                  onclick={(e) => openUpdateModal(deck, e)}
+                  title="Update from community (v{deck.source_version ?? 1} available)"
+                  aria-label="Update from community (v{deck.source_version ?? 1} available)"
+                >
+                  <span class="update-icon-wrap">
+                    <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                      <path d="M21 12a9 9 0 0 0-9-9 9.75 9.75 0 0 0-6.74 2.74L3 8"/>
+                      <path d="M3 3v5h5"/>
+                      <path d="M3 12a9 9 0 0 0 9 9 9.75 9.75 0 0 0 6.74-2.74L21 16"/>
+                      <path d="M16 21h5v-5"/>
+                    </svg>
+                  </span>
+                  <span class="update-badge" aria-hidden="true">{deck.source_version ?? 1}</span>
+                </button>
+              {/if}
               {#if !deck.copied_from_deck_id}
                 {#if deck.published}
                   <button
@@ -187,12 +299,26 @@
                   </button>
                 {/if}
               {/if}
-              <button type="button" class="btn btn-icon" onclick={(e) => { e.stopPropagation(); goEdit(deck.id); }} title="Edit deck" aria-label="Edit deck">
-                <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                  <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
-                  <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
-                </svg>
-              </button>
+              {#if !deck.copied_from_deck_id}
+                <button type="button" class="btn btn-icon" onclick={(e) => { e.stopPropagation(); goEdit(deck.id); }} title="Edit deck" aria-label="Edit deck">
+                  <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
+                    <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
+                  </svg>
+                </button>
+              {:else}
+                <button
+                  type="button"
+                  class="btn btn-icon btn-icon-danger"
+                  onclick={(e) => openRemoveConfirm(deck, e)}
+                  title="Remove from My decks"
+                  aria-label="Remove from My decks"
+                >
+                  <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+                    <path d="M3 6h18"/><path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6"/><path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2"/><line x1="10" y1="11" x2="10" y2="17"/><line x1="14" y1="11" x2="14" y2="17"/>
+                  </svg>
+                </button>
+              {/if}
             </div>
           </div>
         </li>
@@ -218,6 +344,68 @@
     onConfirm={confirmUnpublish}
     onCancel={closeUnpublishConfirm}
   />
+
+  <ConfirmModal
+    open={showRemoveConfirm}
+    title="Remove from My decks"
+    message="Remove this deck from My decks? You can add it again from Community anytime."
+    confirmLabel="Remove"
+    cancelLabel="Cancel"
+    variant="danger"
+    onConfirm={confirmRemoveFromMyDecks}
+    onCancel={closeRemoveConfirm}
+  />
+
+  {#if showUpdateModal}
+    <!-- svelte-ignore a11y_no_noninteractive_element_interactions -->
+    <div
+      class="update-modal-backdrop"
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="update-modal-title"
+      tabindex="-1"
+      onclick={(e) => e.target === e.currentTarget && closeUpdateModal()}
+      onkeydown={(e) => e.key === 'Escape' && closeUpdateModal()}
+    >
+      <div
+        class="update-modal"
+        role="document"
+        tabindex="-1"
+        onclick={(e) => e.stopPropagation()}
+        onkeydown={(e) => e.key === 'Escape' && closeUpdateModal()}
+      >
+        <h2 id="update-modal-title" class="update-modal-title">Update from Community</h2>
+        {#if updateLoading}
+          <p class="update-modal-loading">Loading changes…</p>
+        {:else if updateError}
+          <p class="update-modal-error">{updateError}</p>
+        {:else if updatePreview}
+          <p class="update-modal-intro">
+            <strong>{updateDeck?.title ?? 'This deck'}</strong> has a newer version (v{updatePreview.source?.version ?? 1}) available.
+          </p>
+          <ul class="update-modal-changes">
+            {#each updatePreview.changes as change}
+              <li>{change}</li>
+            {/each}
+          </ul>
+          <p class="update-modal-warn">Your copy will be replaced with the current version. This cannot be undone.</p>
+        {/if}
+        <div class="update-modal-actions">
+          <button type="button" class="btn btn-secondary" onclick={closeUpdateModal} disabled={updateApplying}>
+            Reject
+          </button>
+          <button
+            type="button"
+            class="btn btn-primary"
+            onclick={confirmSourceUpdate}
+            disabled={updateApplying || updateLoading || !!updateError}
+          >
+            {updateApplying ? 'Updating…' : 'Confirm update'}
+          </button>
+        </div>
+      </div>
+    </div>
+  {/if}
 </div>
 
 <style>
@@ -326,6 +514,16 @@
     color: var(--text-muted, #a0a0a0);
     margin-bottom: 0.25rem;
     margin-top: auto;
+    border: none;
+    background: transparent;
+    padding: 0;
+    cursor: default;
+    font: inherit;
+  }
+
+  button.deck-rating {
+    cursor: pointer;
+    text-align: left;
   }
 
   .deck-rating.clickable {
@@ -346,18 +544,6 @@
     color: var(--text-muted, #888);
   }
 
-  .badge {
-    padding: 0.2rem 0.5rem;
-    border-radius: 4px;
-    font-size: 0.75rem;
-    font-weight: 500;
-  }
-
-  .badge.published {
-    background: rgba(34, 197, 94, 0.2);
-    color: #22c55e;
-  }
-
   .deck-card-actions {
     display: flex;
     flex-wrap: wrap;
@@ -366,6 +552,106 @@
     margin-top: 0.75rem;
   }
 
+  .btn-icon-update {
+    position: relative;
+    color: var(--accent, #3b82f6);
+  }
+
+  .btn-icon-update:hover {
+    color: #60a5fa;
+  }
+
+  .update-icon-wrap {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  .update-badge {
+    position: absolute;
+    top: -6px;
+    right: -6px;
+    width: 22px;
+    height: 22px;
+    font-size: 0.8rem;
+    font-weight: 700;
+    color: #fff;
+    background: #dc2626;
+    border: 2px solid var(--card-bg, #1a1a1a);
+    border-radius: 50%;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
+    line-height: 1;
+  }
+
+  .update-modal-backdrop {
+    position: fixed;
+    inset: 0;
+    z-index: 100;
+    background: rgba(0, 0, 0, 0.6);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    padding: 1.5rem;
+  }
+
+  .update-modal {
+    background: var(--card-bg, #1a1a1a);
+    border: 1px solid var(--border, #333);
+    border-radius: 12px;
+    max-width: 420px;
+    width: 100%;
+    padding: 1.5rem;
+  }
+
+  .update-modal-title {
+    margin: 0 0 1rem 0;
+    font-size: 1.2rem;
+    font-weight: 600;
+    color: var(--text-primary, #f0f0f0);
+  }
+
+  .update-modal-loading,
+  .update-modal-error {
+    margin: 0 0 1rem 0;
+    font-size: 0.95rem;
+  }
+
+  .update-modal-error {
+    color: #ef4444;
+  }
+
+  .update-modal-intro {
+    margin: 0 0 0.75rem 0;
+    font-size: 0.95rem;
+    color: var(--text-muted, #a0a0a0);
+  }
+
+  .update-modal-changes {
+    margin: 0 0 1rem 0;
+    padding-left: 1.25rem;
+    font-size: 0.9rem;
+    color: var(--text-primary, #f0f0f0);
+  }
+
+  .update-modal-changes li {
+    margin-bottom: 0.25rem;
+  }
+
+  .update-modal-warn {
+    margin: 0 0 1rem 0;
+    font-size: 0.85rem;
+    color: var(--text-muted, #a0a0a0);
+  }
+
+  .update-modal-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 0.5rem;
+  }
+
   .btn-secondary {
     background: transparent;
   }
@@ -420,4 +706,12 @@
   .btn-icon svg {
     display: block;
   }
+
+  .btn-icon-danger {
+    color: var(--text-muted, #a0a0a0);
+  }
+
+  .btn-icon-danger:hover {
+    color: #ef4444;
+  }
 </style>
diff --git a/src/routes/Settings.svelte b/src/routes/Settings.svelte
index 0b22988..f70117a 100644
--- a/src/routes/Settings.svelte
+++ b/src/routes/Settings.svelte
@@ -126,7 +126,7 @@
       </div>
 
       <div class="form-group">
-        <label>Avatar</label>
+        <span class="form-label">Avatar</span>
         <div class="avatar-row">
           <div class="avatar-wrap">
             <label for="avatar-input" class="avatar-clickable" title="Choose image">
@@ -364,9 +364,12 @@
     background: transparent;
   }
 
-  .btn-small {
-    padding: 0.35rem 0.75rem;
-    font-size: 0.85rem;
+  .form-group .form-label {
+    display: block;
+    font-size: 0.9rem;
+    font-weight: 500;
+    color: var(--text-muted, #a0a0a0);
+    margin-bottom: 0.35rem;
   }
 
   .error {
diff --git a/supabase/migrations/20250214000000_deck_version.sql b/supabase/migrations/20250214000000_deck_version.sql
new file mode 100644
index 0000000..2d91059
--- /dev/null
+++ b/supabase/migrations/20250214000000_deck_version.sql
@@ -0,0 +1,13 @@
+-- Versioning for published decks; used to detect when community copies are outdated.
+-- Run in Supabase SQL Editor (Dashboard → SQL Editor) if not using Supabase CLI migrations.
+
+-- Version of this deck (v1, v2, ...). Bumped when a published deck is updated.
+ALTER TABLE omotomo.decks
+  ADD COLUMN IF NOT EXISTS version integer NOT NULL DEFAULT 1;
+
+-- For copies: version of the source deck at copy time. NULL = copied before versioning.
+ALTER TABLE omotomo.decks
+  ADD COLUMN IF NOT EXISTS copied_from_version integer NULL;
+
+COMMENT ON COLUMN omotomo.decks.version IS 'Incremented when deck (that is or was published) is updated; displayed as v1, v2, etc.';
+COMMENT ON COLUMN omotomo.decks.copied_from_version IS 'Version of the source deck at copy time; used to show "Update" when source has a newer version.';
diff --git a/supabase/migrations/RUN_IF_NEEDED_deck_version_columns.sql b/supabase/migrations/RUN_IF_NEEDED_deck_version_columns.sql
new file mode 100644
index 0000000..09111cd
--- /dev/null
+++ b/supabase/migrations/RUN_IF_NEEDED_deck_version_columns.sql
@@ -0,0 +1,9 @@
+-- Run this in Supabase SQL Editor if "Update" never appears on community copies
+-- (or you see errors about version / copied_from_version).
+-- Uses schema omotomo (match your app's db.schema in src/lib/supabase.js).
+
+ALTER TABLE omotomo.decks
+  ADD COLUMN IF NOT EXISTS version integer NOT NULL DEFAULT 1;
+
+ALTER TABLE omotomo.decks
+  ADD COLUMN IF NOT EXISTS copied_from_version integer NULL;