fix: await switchToTerminal to prevent race condition

The issue was that switchToTerminal() was not being awaited, so
launchCommand() was called while switchToTerminal() was still
executing. This caused a race condition where the WebSocket
closed before the command could be sent.

By awaiting switchToTerminal(), we ensure the terminal is fully
switched before attempting to send any commands.

public/claude-ide/terminal.js

@@ -276,7 +276,7 @@ class TerminalManager {
 
       // Switch to new terminal
       this.debugLog('INIT', `Switching to terminal ${terminalId}...`);
-      this.switchToTerminal(terminalId);
+      await this.switchToTerminal(terminalId);
       this.debugLog('INIT', `Switched to terminal ${terminalId}`);
 
       // Handle terminal type specific initialization