* fix(app): keep focused agent timelines live
Window focus was conflated with app visibility, so switching OS windows could remove the selected timeline subscription. Separate those signals, grace every visibility-driven removal, and cover retained history until authoritative catch-up completes.
* fix(app): keep timeline catch-up failures non-blocking
* fix(app): surface timeline catch-up failures
* fix(app): preserve file preview refocus
* fix(app): preserve optimistic catch-up flow
* fix(terminal): retry size claims until sent
A focus resize could consume its once-per-focus latch before the renderer handed the size to the client. Keep the claim pending across visibility, connection, and renderer readiness changes, and only commit it after the resize is sent.
* fix(terminal): keep disconnected claims retryable
A retained runtime client can outlive its active connection. Require the connection at delivery time so a delayed resize callback cannot commit a claim that was never sent.
* test(terminal): await PTY resize observation
Prove the terminal starts at 80x24 while blurred, then probe through the daemon until its own reported size matches xterm after focus returns. This avoids racing a one-shot stty sample against the asynchronous resize claim.
