Feature: front/back camera toggle

- Added to gifting and profile dialog camera for now. Toggle button is hidden in desktop.
- WIP: same feature for QR scanner camera.
- WIP: ability to specify default camera depending on where it's called.

src/services/PlatformService.ts

@@ -26,6 +26,8 @@ export interface PlatformCapabilities {
   hasFileDownload: boolean;
   /** Whether the platform requires special file handling instructions */
   needsFileHandlingInstructions: boolean;
+  /** Whether the platform is a native app (Capacitor, Electron, etc.) */
+  isNativeApp: boolean;
 }
 
 /**
@@ -92,6 +94,12 @@ export interface PlatformService {
    */
   pickImage(): Promise<ImageResult>;
 
+  /**
+   * Rotates the camera between front and back cameras.
+   * @returns Promise that resolves when the camera is rotated
+   */
+  rotateCamera(): Promise<void>;
+
   /**
    * Handles deep link URLs for the application.
    * @param url - The deep link URL to handle