Release 2026.7.2

Add - German localization (EN/DE) with a language selector

• The whole UI is now localized in English and German. Toolbar, status,
  hints, overview, charts, and all field labels and group titles are translated;
  Core Web Vitals names and lifecycle wire values stay canonical. German terms
  follow the dashboard's wording.
• A toolbar language selector (Auto / English / Deutsch) lets you override
  the language, stored in localStorage. Auto follows the browser language. This
  is needed because the DevTools UI language is not exposed to extensions, so a
  self-managed catalog (i18n.js, both locales bundled) replaces chrome.i18n /
  _locales, which could only follow the browser.
• The DevTools panel tab is now titled "fastmon Beacons".

Add - toolbar icon popup

• Clicking the extension's toolbar icon opens a small popup that points to
  the panel ("Open DevTools (F12), then the fastmon Beacons tab"), localized
  EN/DE. Extensions cannot open DevTools programmatically, so this is a guide,
  not a shortcut. Adds an action with a tooltip and popup.html.

Fix - manifest background and per-browser packaging

• Drop background.scripts from the committed manifest so Chrome no longer
  warns "'background.scripts' requires manifest version of 2 or lower". Chrome
  uses the MV3 service_worker.
• The release workflow now builds two zips, beacon-inspector-chrome-* and
  beacon-inspector-firefox-*. The Firefox manifest is rewritten to an
  event-page background (background.scripts), since Firefox does not run MV3
  background service workers.