feat(02-02): add preferences store with svelte-persisted-store

- Install svelte-persisted-store for localStorage persistence
- Create preferences store with lastEntryType and showCompleted
- Sticky type preference across sessions

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

package.json

@@ -35,6 +35,7 @@
 		"better-sqlite3": "^12.6.2",
 		"drizzle-orm": "^0.45.1",
 		"nanoid": "^5.1.6",
+		"svelte-persisted-store": "^0.12.0",
 		"tailwindcss": "^4.1.18",
 		"zod": "^4.3.6"
 	}