Two pain points:
- IMAP server search is genuinely slow.
- The grid blanked to a whirlpool on every keystroke, so even fast
searches felt dead because you couldn't see your own results.
Fix:
- _localSearchFilter runs synchronously on every keystroke, filtering
the pre-search snapshot by subject / from-name / from-address /
snippet so the grid responds immediately. Snapshot is taken on the
first non-empty keystroke and restored when the input is cleared.
- _doSearch no longer renders the loading-whirlpool spinner into the
grid. The local filter already shows useful results; surface
'Searching…' in the stats badge to indicate the server search is in
flight.
- When server results land, they replace the grid; if the user has
already typed past them, the seq guard skips the stale render.
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