refactor: update theme handling and preference types

- Removed the App_SetTheme IPC channel and related theme management code.
- Updated imports to use preferenceTypes for theme and selection action items.
- Refactored preference service to preload preferences and adjusted related components.
- Cleaned up unused code and comments related to theme management.
- Enhanced the organization of preference-related types and actions for better maintainability.

src/main/data/PreferenceService.ts

@@ -1,7 +1,7 @@
 import { dbService } from '@data/db/DbService'
 import { loggerService } from '@logger'
 import { DefaultPreferences } from '@shared/data/preferences'
-import type { PreferenceDefaultScopeType, PreferenceKeyType } from '@shared/data/types'
+import type { PreferenceDefaultScopeType, PreferenceKeyType } from '@shared/data/preferenceTypes'
 import { IpcChannel } from '@shared/IpcChannel'
 import { and, eq } from 'drizzle-orm'
 import { BrowserWindow, ipcMain } from 'electron'