Remote Control: sessions go stale mid-conversation, /rc reconnect fails

Description

Remote Control sessions go stale unpredictably — not just after extended idle, but during active use mid-conversation. The remote view freezes and stops updating while the underlying CLI session continues working fine in the terminal. Running /rc to re-register produces a URL that redirects to the claude.ai/code dashboard instead of reconnecting to the live session.

Environment

• Claude Code v2.1.62
• Ubuntu 24.04 LTS (VPS, Hostinger KVM)
• tmux persistent sessions (3 windows)
• SSH over Tailscale VPN
• Zed editor as IDE
• Tested on: claude.ai/code (browser) and Claude Desktop app

Reproduction Steps

1. Run Claude Code sessions in tmux on a remote VPS
2. Access sessions via claude.ai/code or Claude Desktop app (Remote Control enabled globally)
3. Sessions work initially
4. Mid-conversation, while actively working, the remote view freezes — stops showing new messages and tool output
5. The CLI session in the terminal continues working perfectly
6. Had to switch to Zed terminal (SSH) to continue the conversation
7. Run /rc in the terminal to re-register the session
8. Copy the generated URL and open in browser
9. Expected: Browser connects to the live session with current conversation
10. Actual: URL redirects to the claude.ai/code dashboard. Stale session still listed with old content.

Key Detail

This is NOT just an overnight/idle timeout issue. The session went stale while the user was actively working with it — in the middle of deploying changes. The Claude Desktop app also went stale at the same time. The user had to switch to a direct terminal connection (Zed SSH) to finish the task.

Additional Symptoms

• Attempting to delete stale sessions from dashboard: "Session is still running. Wait a moment and try again." — the tmux session IS running, but remote view is out of sync
• Claude Desktop app shows same stale state as browser
• /rc does not fix the connection — the re-registered URL just redirects to dashboard
• No warning or disconnect indicator before the view goes stale

Impact

Makes Remote Control unreliable for real work. Cannot trust it to stay connected during a task. Image paste (the main advantage over terminal) is effectively unavailable since the connection drops unpredictably.

Possibly Related

• #28571 (resync after connection drop)
• #28914 (connection dies while tmux stays alive)
• #28402 (session not visible after leaving)
• #28532 (frequent disconnections)