feat: dashboard UX — shortcuts, reconnect, per-project sessions

[aterrylu]

Summary

• Keyboard shortcuts: Ctrl+B toggles sidebar (VSCode-style, captured even when terminal is focused), Ctrl+O forwards to Claude Code for show-details view
• WebSocket auto-reconnect: Exponential backoff (1s→10s max) on unexpected disconnects, immediate reconnect on tab visibility change — fixes stale terminal after idle/tab switch
• Per-project new session: Hover a project in sidebar to see + button that starts a session in that project's directory. createSession now accepts optional workingDirectory

Test plan

• Ctrl+B toggles sidebar from anywhere (terminal focused or not)
• Ctrl+O in active session triggers Claude Code details view
• Switch tabs for ~60s, return — terminal should auto-reconnect without page refresh
• Hover project name in sidebar → green + appears → click starts session in that project dir
• Top-level + still creates session at ~

🤖 Generated with Claude Code

[nox-0x]

🟡 Warning

Problem: handleVisibility can trigger connect() while a pending reconnectTimer is still queued. If the WS dropped while the tab was hidden, the timer was already scheduled — then visibility fires and calls connect() immediately, then the timer fires and calls connect() again. The second call overwrites wsRef.current, leaving the first socket as a zombie writing duplicate data into the terminal.

Why it matters: User returns to tab, gets reconnected, sees output — then a second WebSocket fires ~1s later and starts writing duplicate/interleaved terminal data. Hard to reproduce reliably, but definitely possible.

Suggested fix:

const handleVisibility = () => {
  if (
    document.visibilityState === "visible" &&
    wsRef.current?.readyState !== WebSocket.OPEN &&
    wsRef.current?.readyState !== WebSocket.CONNECTING
  ) {
    if (reconnectTimer) {
      clearTimeout(reconnectTimer);
      reconnectTimer = null;
    }
    retryDelay = 1000;
    connect();
  }
};

[nox-0x]

Solid UX wins — reconnect logic, per-project sessions, and keyboard shortcuts all look clean. One warning left inline: handleVisibility needs to clear the pending reconnectTimer before calling connect() to avoid a double-socket race that could write duplicate output to the terminal. Easy one-liner fix, not blocking merge.