Fix terminal shell prompt (starship) not loading

Use login shell (-l flag) when spawning terminals via dtach so bash
sources .profile which sources .bashrc where starship init lives.

This fixes the regression where new terminals showed minimal prompts
instead of starship when Vibora runs under systemd with limited PATH.

Author: knowsuchagency

server/terminal/dtach-service.ts

@@ -115,8 +115,9 @@ export class DtachService {
     const socketPath = this.getSocketPath(terminalId)
     const shell = process.env.SHELL || '/bin/bash'
     // -n: don't attach after creating
-    // -z: use the specified socket path
-    return ['dtach', '-n', socketPath, '-z', shell]
+    // -z: disable suspend key
+    // -l: login shell (sources .profile which sources .bashrc for starship/etc)
+    return ['dtach', '-n', socketPath, '-z', shell, '-l']
   }
 
   // Get command to attach to an existing session