Fix Vue property conflicts in PlatformServiceMixin implementation

- Remove duplicate property declarations from TopMessage component
- Use (this as any) type assertion for mixin methods
- Resolves 'Data property already defined' warnings
- Fixes 'this.dbQuery is not a function' runtime errors

src/services/PlatformServiceFactory.ts

@@ -38,9 +38,11 @@ export class PlatformServiceFactory {
 
     // Only log when actually creating the instance
     const platform = process.env.VITE_PLATFORM || "web";
-    
+
     if (!PlatformServiceFactory.creationLogged) {
-      console.log(`[PlatformServiceFactory] Creating singleton instance for platform: ${platform}`);
+      console.log(
+        `[PlatformServiceFactory] Creating singleton instance for platform: ${platform}`,
+      );
       PlatformServiceFactory.creationLogged = true;
     }
 
@@ -63,7 +65,7 @@ export class PlatformServiceFactory {
   public static getStats(): { callCount: number; instanceExists: boolean } {
     return {
       callCount: PlatformServiceFactory.callCount,
-      instanceExists: PlatformServiceFactory.instance !== null
+      instanceExists: PlatformServiceFactory.instance !== null,
     };
   }
 }