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Tristan Katana 3e36fae751 feat(mobile): lock chat input while bot is responding + 20s timeout (#1538)
* feat(mobile): lock chat input while bot is responding + 20s timeout

- Add _isWaitingForResponse flag to ChatProvider; set in _startPolling,
  cleared in _stopPolling so it covers the full polling lifecycle not
  just the initial HTTP POST
- Add _pollingStartTime + 20s timeout in _pollForUpdates; if the bot
  never responds the flag resets, errorMessage is surfaced, and input
  unlocks automatically
- Gate send button and keyboard shortcut on isSendingMessage ||
  isWaitingForResponse so users cannot queue up multiple messages
  while a response is in flight

(adding an interrupt like with other chat bots would require a larger rewrite of the backend structure)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(mobile): make polling timeout measure inactivity not total duration

Reset _pollingStartTime whenever assistant content grows so the 20s
timeout only fires if no new content has arrived in that window.
Prevents cutting off a slow-but-streaming response mid-generation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(mobile): lock input for full polling duration, not just until first chunk

- Add isPolling getter to ChatProvider (true while _pollingTimer is active)
- Gate send button and intent on isPolling in addition to isWaitingForResponse
  so users cannot submit overlapping prompts while a response is still streaming
- Also auto-scroll while polling is active

* Fix chat polling timeout race and send re-entry guard

Polling timeout was evaluated before the network attempt, allowing it
to fire just as a response became ready. Timeout check now runs after
each poll attempt and only when no progress was made; network errors
fall through to the same check instead of silently swallowing the tick.

Added _isSendInFlight boolean to prevent rapid taps from re-entering
_sendMessage() during the async token fetch window before provider
flags are set. Guard is set synchronously at the top of the method and
cleared in a finally block.

* fix(mobile): prevent overlapping polls and empty-placeholder stop

Add _isPollingRequestInFlight guard so Timer.periodic ticks are
skipped if a getChat request is still in flight, preventing stale
results from resetting state out of order.

Fix empty assistant placeholder incorrectly triggering _stopPolling:
stable is only declared when a previously observed length exists and
hasn't grown. An initial empty message keeps polling until content
arrives or the timeout fires.

* fix(mobile): reset _lastAssistantContentLength in _stopPolling

Prevents stale content-length state from a prior polling session
bleeding into the next one.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-23 21:48:28 +02:00
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