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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[pkg-pr-new]

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@wxt-dev/analytics

npm i https://pkg.pr.new/@wxt-dev/analytics@2217

@wxt-dev/auto-icons

npm i https://pkg.pr.new/@wxt-dev/auto-icons@2217

@wxt-dev/browser

npm i https://pkg.pr.new/@wxt-dev/browser@2217

@wxt-dev/i18n

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@wxt-dev/is-background

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@wxt-dev/module-react

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@wxt-dev/module-solid

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@wxt-dev/module-svelte

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@wxt-dev/module-vue

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@wxt-dev/runner

npm i https://pkg.pr.new/@wxt-dev/runner@2217

@wxt-dev/storage

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@wxt-dev/unocss

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@wxt-dev/webextension-polyfill

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wxt

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commit: 40d54d5

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.17%. Comparing base (8a56f73) to head (40d54d5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2217      +/-   ##
==========================================
- Coverage   76.21%   76.17%   -0.04%     
==========================================
  Files         115      115              
  Lines        3094     3094              
  Branches      685      685              
==========================================
- Hits         2358     2357       -1     
- Misses        653      655       +2     
+ Partials       83       82       -1     

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