fix(task-board): collapse the search filter chip when cleared externally

[pedrofrxncx]

Source: a state-sync bug found while reading the task-board filter UI (apps/web/src/layouts/task-board/task-filters.tsx), not tied to a specific issue.

Payoff: after clicking "Clear all" (drawer) or the inline "Clear" link (desktop bar) with an active search term, every other filter chip collapses back to its default icon-only state — except the search chip, which stayed visually expanded and empty because its open state was purely internal and only ever reset on its own onBlur. A parent-driven reset (any external change to filters.search, not just the user's own X-button click) never ran that handler.

Failure scenario: type a search term, click elsewhere to blur the search box (it correctly stays expanded showing the term), then click "Clear all" — the search chip remains an empty expanded box instead of collapsing like the rest of the bar.

Fix: track focused via the input's onFocus/onBlur, and when value transitions to "" while the field is not focused, close it. A field the user is actively backspacing to empty (still focused) is untouched — it keeps closing only on its own blur, exactly as before.

Regression test (task-filters-search.test.tsx): re-renders TaskFiltersBar with the search filter cleared (a) after blurring the input — asserts it collapses (input unmounts), and (b) while it's still focused — asserts it stays open, so the fix can't regress into closing under the user mid-edit.

Reviewer command: bun test apps/web/src/layouts/task-board/task-filters-search.test.tsx

Local checks run: bun run fmt, cd apps/web && bunx tsc --noEmit (clean on the touched files), bunx oxlint on both changed files (0 warnings/errors), and the targeted test file above (4/4 pass). Full CI runs the rest.

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Summary by cubic

Collapses the task-board search chip when its value is cleared by a parent action. Previously it stayed expanded and empty after “Clear all” or the inline “Clear”; now it collapses unless the input is focused, preserving mid-edit behavior.

• Track focus with onFocus/onBlur; when value changes to empty while unfocused, close the chip.
• Keep the focused case unchanged: clearing by typing leaves the chip open until blur.
• Add regression tests covering both scenarios in apps/web/src/layouts/task-board/task-filters-search.test.tsx.
• Run tests: bun test apps/web/src/layouts/task-board/task-filters-search.test.tsx.

^{Written for commit 7996323. Summary will update on new commits.}