* fix(tui): show quit feedback during the cold-start fill and exit on the second q (#1143)
Follow-up to #1142. With the input fix in place, q pressed during the
post-paint background index landed instantly but the exit path drained the
fill first - a deterministic ~16.5s silent wait on a 21k-file corpus.
The first q while the fill is active now arms a confirmation and renders
'Finishing background index so the next launch starts warm - press q or
Ctrl+C again to quit now' in the footer area, styled to match the
StatusBar (DIM border, ORANGE accent on the action key). The second q
takes the abrupt path, which #1109 already proved kill-safe (nothing
marked seen without being parsed, resume converges). Ctrl+C is unchanged:
it always exits through the abrupt path, whether or not the confirmation
is armed. q with no fill active exits immediately as before, with no
status-line flicker. The confirmation auto-clears the moment the fill
lands so a stale flag can never trap a later q.
The fill's indexing signal already flows to the dashboard (the #1109
banner reuses it), so no new global state was introduced. Pinning tests
added to tests/dashboard-exit.test.ts.
BREAKING NOTE FOR 0.9.22: ships in 0.9.22, not Unreleased.
* test: flush the unmount frame before the no-flicker assertion
