Add aria-label to filter panel close button

[olitreadwell]

Upstream target

hackforla/food-oasis — no issue; self-found accessibility gap in the search results filter panel.

What changed

Add aria-label="Close filters" to the desktop close button (icon-only IconButton) in the search results filter panel.
Add a Playwright test that verifies the button is reachable by its accessible name and closes the panel.

Why

The button at FilterPanel.tsx:155 rendered only a <CloseIcon /> with no text and no aria-label, so its accessible name was empty. A screen reader announced it just as "button", giving no hint of its purpose.
The fix follows the file's own convention: the sibling clear-filter button already uses aria-label="Clear organization name filter", and AnnouncementSnackbar uses aria-label="close".
Verified empirically: with the source fix reverted, the new test fails (getByRole("button", { name: "Close filters" }) finds nothing); with the fix, it passes.

How to verify

cd client
npm ci
npx playwright install chromium
npm run start &                       # vite dev server on :3000
npx wait-on http://localhost:3000
CI=1 npx playwright test tests/organizations.spec.ts --project=chromium

Coverage

N/A — repo has no coverage tool wired up. The change adds one focused Playwright test to the existing e2e suite.

Checks run locally

• Tests: PASS (organizations.spec.ts 9 passed, 0 failed; full chromium suite 35 passed before + 1 new = 36)
• Lint: N/A — npm run lint only globs **/*.{js,jsx}; this change is .tsx/.ts. The eslint binary is also not installed in the client workspace.
• Typecheck: PASS (npm run typecheck → tsc --noEmit, no errors)
• Build: PASS (npm run build → tsc && vite build, built in ~10s)

Style / template compliance

CONTRIBUTING.md has no code-style rules beyond the wiki workflow and no AI policy; there is no PR template in the repo. The change matches neighbouring code style. Prettier flags FilterPanel.tsx, but that warning pre-exists (present with this change stashed) and Prettier leaves the edited line unchanged, so the file was intentionally not reformatted to avoid unrelated churn.

Confidence: HIGH

Single-attribute a11y fix plus a test that fails without it. The "Close filters" wording is a reasonable label for the panel titled "Filters"; a maintainer may prefer different wording, which is a trivial follow-up.

Recommendation

Ready to send upstream as-is (label wording is the only thing a human might tweak).

Promotion note

To open this against upstream once ready:

gh pr create --repo hackforla/food-oasis --base develop --head olitreadwell:contrib/hackforla-food-oasis-20260804-195901

No CLA or signed-commit requirement was found in hackforla/food-oasis's CONTRIBUTING.md or .github config (no PR template exists in this repo; the body above follows the CONTRIBUTING.md guidance to route developer contributions through the project's own dev workflow).

[olitreadwell]

Renaming branch to fix/aria_label_filter_panel_close_button for clearer naming convention. Reopening as a new PR with identical content.