refactor: Rename internal popup mv2Key option to actionType

[aklinker1]

Overview

Adds actionType as a properly-named replacement for mv2Key on PopupEntrypointOptions. The old mv2Key name was misleading because it also applies to Firefox MV3. Both properties are kept in sync via getter/setter so modules reading or writing either one see the same value. mv2Key is marked @deprecated.

Manual Testing

pnpm --filter wxt vitest run src/core/utils/__tests__/manifest.test.ts — all 83 tests pass.

Related Issue

Follow-up from #2200 (comment)

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.63%. Comparing base (09f27a9) to head (00769c5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/wxt/src/core/utils/building/find-entrypoints.ts	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2249      +/-   ##
==========================================
+ Coverage   76.57%   76.63%   +0.05%     
==========================================
  Files         117      117              
  Lines        3155     3163       +8     
  Branches      711      711              
==========================================
+ Hits         2416     2424       +8     
  Misses        657      657              
  Partials       82       82              

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