• Firefox for Android support. The Firefox build now declares
  browser_specific_settings.gecko_android (minimum 142, two releases above the
  desktop floor because data_collection_permissions reached Android later), so
  the AMO listing installs on Android instead of being treated as desktop-only.
  This is the only mobile route for Bark: Chromium on Android compiles out the
  extensions subsystem, so Vanadium on GrapheneOS and every other
  Chromium-derived Android browser cannot run it. See docs/mobile.md
  for the Cambium and direct-NIP-46 alternatives.

• Approvals no longer fail outright on mobile. Firefox for Android implements no
  windows API at all, so every ask-policy request would have been denied with
  "Could not open approval window". The approval surface now falls back to a
  foreground tab: dismissing it denies, "Review in Bark" foregrounds it, and the
  background closes it once the request settles. Desktop keeps the popup window.
• The popup and approval pages lay out against the device width rather than the
  980px default mobile viewport. No change to desktop rendering.

Verified on a Pixel 10 Pro XL running GrapheneOS with Firefox for Android
153.0.4: provider injection, the approval tab (allow once, trust site, deny,
dismiss-to-deny, queued approvals), and signing after the event page suspends.

"The message port closed before a response was received" is now treated
as a service-worker wake-up error and retried, matching the other
wake-up wordings. Previously the first request after the worker idled
out could fail with this error instead of retrying.