fix: add Firefox action manifest typings

[VaughnBosu]

Overview

Added FirefoxActionManifestOptions interface with browser_style, default_area, and theme_icons, and applied it to action, browser_action, and page_action in UserManifest.

Manual Testing

• pnpm test run manifest passes

• Added default_area and theme_icons to wxt-demo/wxt.config.ts — no type errors, and the values appeared in the built manifest.json

Related Issue

This PR closes #2096

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@wxt-dev/analytics

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commit: 241e339

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.60%. Comparing base (2a21279) to head (241e339).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2217      +/-   ##
==========================================
- Coverage   76.66%   76.60%   -0.07%     
==========================================
  Files         117      117              
  Lines        3163     3163              
  Branches      711      711              
==========================================
- Hits         2425     2423       -2     
- Misses        656      658       +2     
  Partials       82       82              

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[aklinker1]

Page action doesn't support theme_icons

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/page_action#browser_compatibility

vs

https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/browser_action#browser_compatibility

[aklinker1]

https://github.com/wxt-dev/wxt/pull/2217/changes#r3020254936

If browser_style isn't supported on the action, seems like we shouldn't create a shared type if all 3 are different.

[github-actions]

Thanks for helping make WXT better!