Fix: Standardize Electron bridge and implement robust caching

- Refactored all IPC methods and parameters to snake_case for consistency with SvelteKit.
- Implemented exhaustive background caching engine with download locking.
- Reverted to legacy-proven flat hash storage pattern (hash.file).
- Added axios for reliable stream-based binary downloads.
- Updated preload and main handlers to support recursive room data fetching.

src/shared/types.ts

@@ -11,6 +11,14 @@ export interface AetherNativeBridge {
   getDeviceConfig: () => Promise<any>;
   getJWT: () => Promise<string | null>;
   log: (message: string) => void;
+  // Shell Handlers
+  openFolder: (path: string) => Promise<{success: boolean, error?: string}>;
+  runCommand: (cmd: string) => Promise<{success: boolean, stdout: string, stderr: string, error?: string}>;
+  launchFile: (path: string) => Promise<{success: boolean, error?: string}>;
+  // File/Cache Handlers
+  checkCache: (args: {cacheRoot: string, hash: string}) => Promise<boolean>;
+  downloadToCache: (args: {url: string, cacheRoot: string, hash: string, apiKey: string}) => Promise<{success: boolean, path?: string, error?: string}>;
+  launchFromCache: (args: {cacheRoot: string, hash: string, tempRoot: string, filename: string}) => Promise<{success: boolean, error?: string}>;
 }
 
 declare global {