ext-v1.2.0

- **Firefox build.** The same detector, popup, DevTools panel, and per-rule toggles now ship as a Firefox add-on. `bun run build:extension` emits a Gecko-compatible package next to the Chrome one, with the background worker declared as an event page and a data-collection declaration that states what the extension already does: the scan runs in the page, and nothing leaves your machine.

- **Firefox DevTools paths are fixed.** DevTools panel and sidebar URLs are root-relative in the Firefox manifest, so packaged builds can open their extension pages reliably.

- **Detector results match the latest engine.** The overlay picks up the same false-positive fixes as the CLI: hidden-element skips, sr-only text-overflow handling, tighter repeated kicker, oversized H1, clipped-overflow, OKLCH alpha, Sass-adjacent CSS parsing, transparent-border handling, and exact animation values for bounce/easing findings.

- **Scan responses are easier to correlate.** Extension scan messages echo scan IDs back to the caller, and the store metadata and icon set were refreshed for the current 41-rule detector.