WIP: Fix Electron build issues and migrate to @nostr/tools

- Fix TypeScript compilation errors in platform services
- Add missing rotateCamera method and isNativeApp property
- Fix index.html path resolution for packaged Electron apps
- Create separate Vite config for Electron renderer process
- Migrate from nostr-tools to @nostr/tools via JSR for ESM compatibility
- Update all Vite configs to handle mixed npm/JSR package management
- Add comprehensive documentation in BUILDING.md
- Fix preload script path resolution in packaged builds

Resolves build failures with deep imports and missing UI in AppImage.

src/services/platforms/ElectronPlatformService.ts

@@ -205,6 +205,7 @@ export class ElectronPlatformService implements PlatformService {
       isIOS: false,
       hasFileDownload: false, // Not implemented yet
       needsFileHandlingInstructions: false,
+      isNativeApp: true, // Electron is a native app
     };
   }
 
@@ -345,4 +346,13 @@ export class ElectronPlatformService implements PlatformService {
       );
     }
   }
+
+  /**
+   * Rotates the camera between front and back cameras.
+   * @returns Promise that resolves when the camera is rotated
+   * @throws Error indicating camera rotation is not implemented in Electron
+   */
+  async rotateCamera(): Promise<void> {
+    throw new Error("Camera rotation not implemented in Electron platform");
+  }
 }