* fix(mobile): keep terminal input composable while the connection is cut
Fixes#6713. While the socket was down every input control on the mobile
session screen was hard-disabled by the single canSend gate — the keyboard
would not even open, and everything typed during the outage was silently
discarded.
Split the gate: canCompose (local composing, survives an outage) vs canSend
(needs the live socket). The buffered command box stays editable offline and
holds the text; the send button, accessory keys, and live-input capture stay
connection-gated; the live/buffered mode toggle stays tappable so live-mode
users can reach the compose box. The return-key submit path holds composed
text instead of firing a doomed RPC.
Also reset the live-input mirror when the connection drops: bytes sent into a
stalled link are lost but were recorded as delivered, so the first
post-reconnect send replayed stale fragments or emitted phantom erases
(observed as `YZZYecho CLEANLINE` corrupting the next command on device).
* fix(mobile): stop stalled terminal input replaying into the PTY after reconnect
Device verification of the first commit surfaced the real replay vector for
the second defect: sendRequest parks in waitForConnected while disconnected,
so live-mirror deltas queued behind a dying send drain into the connect wait
and fire on the next socket — bytes typed during an outage executed tens of
seconds later (observed on device as the prompt reading `nOPQ` after
reconnect with no post-recovery typing).
Add SendRequestOptions.failWhenDisconnected — reject now instead of parking —
and opt in every keystroke-grade terminal send: live mirror, accessory keys,
buffered command send, and gesture arrows. Deliberate command sends
(initialPrompt on terminal create) keep the connect wait.
terminal.send param construction moves to terminal-send-request.ts and the
accessory raw-send tail to terminal-live-accessory-raw-send.ts.
Re-verified on simulator through a blackhole cut-proxy: text typed during the
stall no longer replays, and the first post-recovery command executes verbatim.
* test(mobile): assert route-slice anchors are unique so pins cannot slice the wrong region
* docs(mobile): trim replay-fix comments to one-line rationale
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