* fix(desktop): make composer message queue reliable
The queue felt 'dumb' because of three real bugs:
1. Drained-after-interrupt sends went silent. cancelRun sets
interrupted:true and nothing reset it; submitPromptText's optimistic
seed preserved it, and the message stream drops every delta while
interrupted. So Send-now-while-busy and any interrupt+drain submitted
the next turn into a muted session. Fix: a fresh submit is a new turn —
seed interrupted:false.
2. Back-to-back queue drains stalled. The drain fires on the busy->false
settle edge, but busyRef (synced from the busy store by a separate
effect) can still read true on that same edge, so the drained send hit
the busy guard, returned false, and the entry was never removed. Fix:
fromQueue sends bypass the busyRef guard (the queue drain lock
serializes them); the user path keeps the guard.
3. Double-enter-to-interrupt killed single non-queue turns. The hidden
450ms timer meant a natural double-tap after sending stopped the agent.
Fix: empty Enter while busy is a no-op; interrupting is explicit —
Stop button or Esc.
Also: clean stop (no [interrupted] marker), Send-now works while busy
(promote + interrupt + auto-drain), settle on the interrupted completion
path. Adds regression tests and unblocks the prompt-actions suite by
completing its stale @/hermes mock.
* fix(desktop): float the queue panel as an overlay so the chat doesn't resize
The queue list rendered in-flow inside the composer root, so its height
fed --composer-measured-height (the composer rect drives the thread's
bottom padding + last-message clearance). Queuing a message grew that
rect and the whole chat visibly resized.
Anchor the panel out of flow above the composer (absolute bottom-full,
capped at 40vh with internal scroll). It no longer contributes to the
measured height, so the thread layout stays put and the list overlays the
(already faded) chat. Still collapsible via the panel's own
disclosure header.
* fix(desktop): queue panel collapsed by default + shared border with composer
- Default the queue disclosure to collapsed (compact 'N queued' pill)
instead of expanded.
- Drop the gap and merge the panel into the composer: square bottom
corners, no bottom border/radius, and overlap down by the Root's pt-2
(-mb-2) so the panel's borderless bottom lands on the composer surface's
top border — one continuous bordered shape.
* style(desktop): tighten queue panel padding
* style(desktop): trim queue-ux comments to house style
* style(desktop): drop 'Cursor' references from comments
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