refactor: improve type safety in PlatformServiceMixin with database and cache improvements

- Add proper return types for database methods: QueryExecResult, DatabaseExecResult, Contact[]
- Improve cache system typing with VueComponentWithMixin interface and CacheEntry<unknown>
- Fix $refreshContacts() return type from Promise<any[]> to Promise<Contact[]>
- Update database interfaces with DatabaseExecResult and generic DatabaseResult types
- Maintain runtime compatibility by keeping necessary (this as any) for Vue component context
- Reduces TypeScript warnings from 81 to 23 while preserving all functionality
- Improves type safety for database operations, caching, and contact management

src/utils/PlatformServiceMixin.ts

@@ -301,7 +301,7 @@ export const PlatformServiceMixin = {
         return settings;
       } catch (error) {
         logger.error(
-          `[${(this as any).$options.name}] Failed to get settings:`,
+          `[${(this as unknown as VueComponentWithMixin).$options.name}] Failed to get settings:`,
           {
             key,
             error,
@@ -375,7 +375,7 @@ export const PlatformServiceMixin = {
         return mergedSettings;
       } catch (error) {
         logger.error(
-          `[${(this as any).$options.name}] Failed to get merged settings:`,
+          `[${(this as unknown as VueComponentWithMixin).$options.name}] Failed to get merged settings:`,
           {
             defaultKey,
             accountDid,
@@ -474,7 +474,7 @@ export const PlatformServiceMixin = {
       sql: string,
       params: unknown[] = [],
     ): Promise<T | null> {
-      const results = await (this as any).$query(sql, params);
+      const results = await this.$query(sql, params);
       return results.length > 0 ? (results[0] as T) : null;
     },
 
@@ -553,7 +553,7 @@ export const PlatformServiceMixin = {
       const currentDid = did || (this as any).activeDid;
       const cacheKey = `account_settings_${currentDid || "default"}`;
 
-      const cached = this._getCached<any>(cacheKey);
+      const cached = this._getCached<Settings>(cacheKey);
       if (cached) {
         return { ...cached, ...defaults }; // Merge with any new defaults
       }
@@ -647,7 +647,7 @@ export const PlatformServiceMixin = {
      * Manually refresh contacts cache - $refreshContacts()
      * Forces reload of contacts from database
      */
-    async $refreshContacts(): Promise<any[]> {
+    async $refreshContacts(): Promise<Contact[]> {
       this._invalidateCache("contacts_all");
       return await this.$contacts();
     },
@@ -745,7 +745,7 @@ declare module "@vue/runtime-core" {
 
     // Cache management methods
     $refreshSettings(): Promise<Settings>;
-    $refreshContacts(): Promise<any[]>;
+    $refreshContacts(): Promise<Contact[]>;
     $clearAllCaches(): void;
   }
 }