feat(schema): make note_id and is_reversed NOT NULL

All cards now require note association - legacy card support removed.
This aligns with the note-based card architecture introduced in Phase 8.

- Add database migration for NOT NULL constraints
- Update client Dexie schema to version 3
- Remove LegacyCardItem component and legacy card handling
- Update sync schemas and type definitions
- Update all tests to use note-based cards

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/src/client/sync/push.test.ts b/src/client/sync/push.test.ts
index 9a42eff..16198c1 100644
--- a/src/client/sync/push.test.ts
+++ b/src/client/sync/push.test.ts
@@ -131,8 +131,8 @@ describe("pendingChangesToPushData", () => {
 			{
 				id: "card-1",
 				deckId: "deck-1",
-				noteId: null,
-				isReversed: null,
+				noteId: "test-note-id",
+				isReversed: false,
 				front: "Question",
 				back: "Answer",
 				state: CardState.Review,
@@ -163,8 +163,8 @@ describe("pendingChangesToPushData", () => {
 		expect(result.cards[0]).toEqual({
 			id: "card-1",
 			deckId: "deck-1",
-			noteId: null,
-			isReversed: null,
+			noteId: "test-note-id",
+			isReversed: false,
 			front: "Question",
 			back: "Answer",
 			state: CardState.Review,
@@ -187,8 +187,8 @@ describe("pendingChangesToPushData", () => {
 			{
 				id: "card-1",
 				deckId: "deck-1",
-				noteId: null,
-				isReversed: null,
+				noteId: "test-note-id",
+				isReversed: false,
 				front: "New Card",
 				back: "Answer",
 				state: CardState.New,
@@ -566,6 +566,8 @@ describe("PushService", () => {
 
 			const card = await localCardRepository.create({
 				deckId: deck.id,
+				noteId: "test-note-id",
+				isReversed: false,
 				front: "Question",
 				back: "Answer",
 			});
@@ -611,6 +613,8 @@ describe("PushService", () => {
 
 			const card = await localCardRepository.create({
 				deckId: deck.id,
+				noteId: "test-note-id",
+				isReversed: false,
 				front: "Q",
 				back: "A",
 			});
@@ -740,6 +744,8 @@ describe("PushService", () => {
 
 			const card = await localCardRepository.create({
 				deckId: deck.id,
+				noteId: "test-note-id",
+				isReversed: false,
 				front: "Q",
 				back: "A",
 			});