Refactor Tauri Integration to Use Platform Context

- Replaced direct Tauri API calls with a unified platform context across multiple components, enhancing code maintainability and readability.
- Removed the deprecated tauri.ts file, consolidating platform-related logic into the new PlatformContext.
- Updated components such as App, AudioPlayer, and ServerSettings to utilize the new platform context for lifecycle management and server interactions.
- Improved platform detection and handling for audio playback and system audio capture functionalities.
- Ensured consistent error handling and user feedback across the application when interacting with platform-specific features.

web/src/platform/filesystem.ts

@@ -0,0 +1,15 @@
+import type { PlatformFilesystem, FileFilter } from '@/platform/types';
+
+export const webFilesystem: PlatformFilesystem = {
+  async saveFile(filename: string, blob: Blob, _filters?: FileFilter[]) {
+    // Browser: trigger download
+    const url = window.URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = filename;
+    document.body.appendChild(a);
+    a.click();
+    window.URL.revokeObjectURL(url);
+    document.body.removeChild(a);
+  },
+};