feat(Wind): Add stub channels for BrowserViewGroup management

Expand the `StubChannels` registry in `TauriMainProcessService.ts` to include definitions for the `browserViewGroup` service. Introduce stub entries for `updateKeybindings`, `updateTheme`, `updateConfiguration`, `getBrowserViews`, `openDevTools`, and `closeDevTools`.

These definitions prepare the Wind workbench service layer for upcoming integrations with the native Mountain backend, establishing the contract for browser-based view operations and developer tooling interactions.

Author: NikolaRHristov

Source/Service/TauriMainProcessService.ts

@@ -254,7 +254,14 @@ const StubChannels: Record<string, Record<string, unknown>> = {
 
 	mcpGateway: {},
 
-	browserViewGroup: {},
+	browserViewGroup: {
+		updateKeybindings: undefined,
+		updateTheme: undefined,
+		updateConfiguration: undefined,
+		getBrowserViews: [],
+		openDevTools: undefined,
+		closeDevTools: undefined,
+	},
 
 	// Fix: terminals.windows - IExternalTerminalService.getDefaultTerminalForPlatforms()
 	externalTerminal: {