refactor(database): migrate to new modular database layer and unify data access

- Remove legacy database.ts, LocalDataSource.ts, and MessageRepository.ts
- Create new src/database/ module with messageRepository, userCacheRepository, conversationRepository, and groupCacheRepository
- Update all consumers to import from @/database instead of services/database
- Add web platform blur handling for modal components to fix focus issues
- Flatten SystemMessageItem and NotificationsScreen styles for consistent design
- Add draggable slider in ChatSettingsScreen and dynamic font size support
- Introduce 9 new chat color themes
- Add profile screens for about, terms, and privacy policy with navigation routes
- Add policy links to login and registration screens
- Fix post share URL format from /posts/ to /post/

src/database/index.ts

@@ -0,0 +1,54 @@
+import { localDataSource } from './LocalDataSource';
+import { databaseManager } from './core/DatabaseManager';
+
+export { databaseManager } from './core/DatabaseManager';
+export { DatabaseManager } from './core/DatabaseManager';
+export { localDataSource, LocalDataSource } from './LocalDataSource';
+
+export {
+  messageRepository, MessageRepository,
+  conversationRepository, ConversationRepository,
+  userCacheRepository, UserCacheRepository,
+  groupCacheRepository, GroupCacheRepository,
+  postCacheRepository, PostCacheRepository,
+} from './repositories';
+
+export { CachedMessage } from './types';
+
+export async function clearAllData(): Promise<void> {
+  await localDataSource.enqueueWrite(async () => {
+    await localDataSource.execute(`DELETE FROM messages`);
+    await localDataSource.execute(`DELETE FROM conversations`);
+    await localDataSource.execute(`DELETE FROM conversation_cache`);
+    await localDataSource.execute(`DELETE FROM conversation_list_cache`);
+    await localDataSource.execute(`DELETE FROM users`);
+    await localDataSource.execute(`DELETE FROM current_user_cache`);
+    await localDataSource.execute(`DELETE FROM groups`);
+    await localDataSource.execute(`DELETE FROM group_members`);
+    await localDataSource.execute(`DELETE FROM posts_cache`);
+  });
+}
+
+export const initDatabase = async (userId?: string | null): Promise<void> => {
+  await databaseManager.initialize(userId);
+};
+
+export const closeDatabase = async (): Promise<void> => {
+  await databaseManager.close();
+};
+
+export const getCurrentDbUserId = (): string | null => {
+  return databaseManager.getCurrentUserId();
+};
+
+export const isDbInitialized = (): boolean => {
+  return databaseManager.isReady();
+};
+
+export const getDbInstance = () => {
+  return databaseManager.getDbSync();
+};
+
+export const getDb = async (timeout?: number) => {
+  return databaseManager.getDb(timeout);
+};