Deck version update

supabase/migrations/20250214000000_deck_version.sql

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+-- Versioning for published decks; used to detect when community copies are outdated.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.';

supabase/migrations/RUN_IF_NEEDED_deck_version_columns.sql

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+-- 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;