* fix(mobile): keep native chat from resizing the covered terminal PTY
Native chat reads the agent transcript stream and never renders the
terminal grid, but two paths still pushed phone dimensions into the
covered PTY, reflowing the desktop terminal for no benefit:
- The covered lease-only subscribe carried the cached viewport, and
handleMobileSubscribe phone-fits the PTY whenever a viewport is
present. The lease now omits the viewport so the host keeps the
desktop baseline and late-binds on return to the terminal tab.
- useTerminalViewportRefit measured the still-mounted WebView under
the chat overlay and sent terminal.updateViewport on rotation,
keyboard, text-scale, reconnect, and iOS-resume triggers. Refits
are now suppressed while native chat covers the active terminal;
the triggers already mark the viewport stale, and the
return-to-terminal resubscribe re-measures.
* fix(mobile): harden native-chat resize suppression
4fce2de494