test: fix mock configuration and lint errors in unit tests

- Fix logger mock missing default export in extractor.test.ts
- Fix performance-monitor mock configuration
- Fix prefer-const in validation-database.test.ts
- Fix no-unsafe-function-type in cleaner-handler.test.ts
- Fix no-empty-function in cleaner-application-service.test.ts
- Run prettier format on test files

All 622 tests now passing (59 files, 3 skipped)

tests/unit/ipc/cleaner-handler.test.ts

@@ -18,7 +18,7 @@ vi.mock('../../../src/main/services/logger/error-utils', () => ({
 }))
 
 // In-memory storage for registered IPC handlers
-const registeredHandlers: Map<string, Function> = new Map()
+const registeredHandlers: Map<string, (...args: any[]) => any> = new Map()
 
 // Mock Electron's ipcMain to capture registered handlers
 vi.mock('electron', () => {