feat: improve Monitor panel UX and preserve session names

- Monitor panel now opens by default on webapp start
- Replace "Reconcile" button with refresh icon (↻)
- Change close button to toggle (▼/▲) for collapse/expand
- Preserve session display names when saving screen info
- Use stored name when restoring sessions (no more "Restored:" prefix)
- Show session name in Monitor panel instead of screen name
- Kill screen session when closing a tab

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/types.ts

@@ -214,6 +214,7 @@ export interface ScreenSession {
   workingDir: string;
   mode: 'claude' | 'shell';
   attached: boolean;        // Whether webserver is attached
+  name?: string;            // Session display name (tab name)
 }
 
 export interface ProcessStats {