The X was redundant with the top-bar search icon (both closed the bar).
Now the X empties the query and results but leaves the bar open; closing
is the search icon's toggle.
- editor: new findClear (empties query/matches, bumps Gen so an in-flight
scan of the old query is dropped, disarms the settle) and FindClear
handler; the X icon now runs FindClear.
- main: mirrors the logic-side clear into the main-owned widget input
(frame.FindQuery=="" while the widget still has text -> SetText("")).
- tests: unit findClear (stays open, supersedes in-flight scan); e2e X
clears but keeps the bar open and focus, close now via ToggleFind.
- doc: spec updated (clear button vs icon toggle).
Greg Pomerantz
d726ea7244