refactor(client): migrate state management from React Context to Jotai

Replace AuthProvider and SyncProvider with Jotai atoms for more granular
state management and better performance. This migration:

- Creates atoms for auth, sync, decks, cards, noteTypes, and study state
- Uses atomFamily for parameterized state (e.g., cards by deckId)
- Introduces StoreInitializer component for subscription initialization
- Updates all components and pages to use useAtomValue/useSetAtom
- Updates all tests to use Jotai Provider with createStore pattern

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

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

1 files changed, 22 insertions, 0 deletions

diff --git a/src/client/atoms/noteTypes.ts b/src/client/atoms/noteTypes.ts
new file mode 100644
index 0000000..adc9d44
--- /dev/null
+++ b/src/client/atoms/noteTypes.ts
@@ -0,0 +1,22 @@
+import { apiClient } from "../api/client";
+import { createReloadableAtom } from "./utils";
+
+export interface NoteType {
+	id: string;
+	name: string;
+	frontTemplate: string;
+	backTemplate: string;
+	isReversible: boolean;
+	createdAt: string;
+	updatedAt: string;
+}
+
+// =====================
+// NoteTypes List - Suspense-compatible
+// =====================
+
+export const noteTypesAtom = createReloadableAtom(async () => {
+	const res = await apiClient.rpc.api["note-types"].$get();
+	const data = await apiClient.handleResponse<{ noteTypes: NoteType[] }>(res);
+	return data.noteTypes;
+});