feat(decks): add default note type setting per deckHEADmain

Allow each deck to specify a default note type that is auto-selected
when creating new notes. Includes DB schema migration, server API
updates, sync layer support, and UI for editing the default in the
deck settings modal.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

3 files changed, 29 insertions, 0 deletions

diff --git a/src/client/db/index.test.ts b/src/client/db/index.test.ts
index 0dd3758..32011b5 100644
--- a/src/client/db/index.test.ts
+++ b/src/client/db/index.test.ts
@@ -64,6 +64,7 @@ describe("KiokuDatabase", () => {
 			userId: "user-1",
 			name: "Test Deck",
 			description: "A test deck",
+			defaultNoteTypeId: null,
 			createdAt: new Date("2024-01-01"),
 			updatedAt: new Date("2024-01-01"),
 			deletedAt: null,
diff --git a/src/client/db/index.ts b/src/client/db/index.ts
index 50d8bbd..a3fbd49 100644
--- a/src/client/db/index.ts
+++ b/src/client/db/index.ts
@@ -77,6 +77,7 @@ export interface LocalDeck {
 	userId: string;
 	name: string;
 	description: string | null;
+	defaultNoteTypeId: string | null;
 	createdAt: Date;
 	updatedAt: Date;
 	deletedAt: Date | null;
@@ -251,6 +252,17 @@ export class KiokuDatabase extends Dexie {
 			notes: "id, deckId, noteTypeId, updatedAt",
 			noteFieldValues: "id, noteId, noteFieldTypeId, updatedAt",
 		});
+
+		// Version 4: Add defaultNoteTypeId to decks (no index change needed)
+		this.version(4).stores({
+			decks: "id, userId, updatedAt",
+			cards: "id, deckId, noteId, updatedAt, due, state",
+			reviewLogs: "id, cardId, userId, reviewedAt",
+			noteTypes: "id, userId, updatedAt",
+			noteFieldTypes: "id, noteTypeId, updatedAt",
+			notes: "id, deckId, noteTypeId, updatedAt",
+			noteFieldValues: "id, noteId, noteFieldTypeId, updatedAt",
+		});
 	}
 }
 
diff --git a/src/client/db/repositories.test.ts b/src/client/db/repositories.test.ts
index b461990..6a77760 100644
--- a/src/client/db/repositories.test.ts
+++ b/src/client/db/repositories.test.ts
@@ -33,6 +33,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Test Deck",
 				description: "A test deck",
+				defaultNoteTypeId: null,
 			});
 
 			expect(deck.id).toBeDefined();
@@ -51,6 +52,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Test Deck",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			const found = await db.decks.get(created.id);
@@ -64,6 +66,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Test Deck",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			const found = await localDeckRepository.findById(created.id);
@@ -82,16 +85,19 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Deck 1",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 			await localDeckRepository.create({
 				userId: "user-1",
 				name: "Deck 2",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 			await localDeckRepository.create({
 				userId: "user-2",
 				name: "Other User Deck",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			const decks = await localDeckRepository.findByUserId("user-1");
@@ -104,6 +110,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Deleted Deck",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 			await localDeckRepository.delete(deck.id);
 
@@ -118,6 +125,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Original Name",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			const updated = await localDeckRepository.update(deck.id, {
@@ -147,6 +155,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Test Deck",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			const result = await localDeckRepository.delete(deck.id);
@@ -169,11 +178,13 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Unsynced",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 			const deck2 = await localDeckRepository.create({
 				userId: "user-1",
 				name: "Synced",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 			await localDeckRepository.markSynced(deck2.id, 1);
 
@@ -189,6 +200,7 @@ describe("localDeckRepository", () => {
 				userId: "user-1",
 				name: "Test",
 				description: null,
+				defaultNoteTypeId: null,
 			});
 
 			await localDeckRepository.markSynced(deck.id, 5);
@@ -212,6 +224,7 @@ describe("localCardRepository", () => {
 			userId: "user-1",
 			name: "Test Deck",
 			description: null,
+			defaultNoteTypeId: null,
 		});
 		deckId = deck.id;
 	});
@@ -411,6 +424,7 @@ describe("localReviewLogRepository", () => {
 			userId: "user-1",
 			name: "Test Deck",
 			description: null,
+			defaultNoteTypeId: null,
 		});
 		deckId = deck.id;
 
@@ -935,6 +949,7 @@ describe("localNoteRepository", () => {
 			userId: "user-1",
 			name: "Test Deck",
 			description: null,
+			defaultNoteTypeId: null,
 		});
 		deckId = deck.id;
 
@@ -1094,6 +1109,7 @@ describe("localNoteFieldValueRepository", () => {
 			userId: "user-1",
 			name: "Test Deck",
 			description: null,
+			defaultNoteTypeId: null,
 		});
 
 		const noteType = await localNoteTypeRepository.create({