refactor(preferences): enhance PreferenceService with public access modifiers and improve caching logic

This commit updates the PreferenceService by adding public access modifiers to several methods, improving code clarity and consistency. It also refines the caching logic to eliminate unnecessary type assertions and streamline the handling of preference values. Additionally, minor formatting adjustments are made for better readability across the service and related hooks.

src/main/data/PreferenceService.ts

@@ -97,9 +97,8 @@ export class PreferenceService {
         throw new Error(`Preference ${key} not found in cache`)
       }
 
-      const db = dbService.getDb()
-
-      await db
+      await dbService
+        .getDb()
         .update(preferenceTable)
         .set({
           value: value as any