fix: session restoration now properly attaches to existing screens

- Pass existing screenSession to Session constructor for restored sessions
- Skip terminal buffer clearing when attaching to restored (existing) screens
- Frontend auto-calls /interactive endpoint when selecting a restored session
- Fixes issue where restored sessions appeared broken after server restart

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

src/web/public/app.js

@@ -633,6 +633,19 @@ class ClaudemanApp {
     this.activeSessionId = sessionId;
     this.renderSessionTabs();
 
+    // Check if this is a restored session that needs to be attached
+    const session = this.sessions.get(sessionId);
+    if (session && session.pid === null && session.status === 'idle') {
+      // This is a restored session - attach to the existing screen
+      try {
+        await fetch(`/api/sessions/${sessionId}/interactive`, { method: 'POST' });
+        // Update local session state
+        session.status = 'busy';
+      } catch (err) {
+        console.error('Failed to attach to restored session:', err);
+      }
+    }
+
     // Load terminal buffer for this session
     try {
       const res = await fetch(`/api/sessions/${sessionId}/terminal`);

src/web/server.ts

@@ -1393,14 +1393,15 @@ export class WebServer extends EventEmitter {
         const screens = this.screenManager.getScreens();
         for (const screen of screens) {
           if (!this.sessions.has(screen.sessionId)) {
-            // Create a session object for this screen
+            // Create a session object for this screen with the existing screenSession
             const session = new Session({
               id: screen.sessionId,  // Preserve the original session ID
               workingDir: screen.workingDir,
               mode: screen.mode,
               name: screen.name || screen.screenName,
               screenManager: this.screenManager,
-              useScreen: true
+              useScreen: true,
+              screenSession: screen  // Pass the existing screen so startInteractive() can attach to it
             });
 
             this.sessions.set(session.id, session);