fix: don't add an empty content_scripts array for runtime-only content scripts

[rxliuli]

Summary

manifestContentScripts.length >= 0 is a tautology (array length is never negative), so manifest.content_scripts was set to [] whenever a project had at least one content script entrypoint but every one of them used registration: 'runtime'.

Chrome and Firefox silently ignore the empty array, but Safari treats it as invalid. The build/convert step itself doesn't complain, but once the converted extension is run and inspected in Safari, its Extensions settings show:

Errors for "<Extension Name>":
❌ Empty or invalid content_scripts manifest entry.

(Reproduced by building a project whose only content script uses registration: 'runtime', converting it with wxt zip -b safari, then opening the extension in Safari.)

Changes

• manifestContentScripts.length >= 0 → > 0, so content_scripts is only added to the manifest when there's actually something to declare.
• Updated the existing test that asserted content_scripts equals [] for a runtime-only project — it now asserts undefined, matching the convention used elsewhere in the same file (e.g. the "skipped entrypoints" test).
• Added a test covering the mixed case (one runtime-registered + one manifest-registered content script) to confirm the fix doesn't regress the normal case.

Test plan

• vitest run src/core/utils/__tests__/manifest.test.ts — 92 tests passing, run repeatedly across several random faker seeds
• tsc --noEmit — no new errors

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commit: 16733a7

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.21%. Comparing base (971ffb0) to head (16733a7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2580      +/-   ##
==========================================
- Coverage   79.34%   79.21%   -0.13%     
==========================================
  Files         134      134              
  Lines        3994     3994              
  Branches      921      921              
==========================================
- Hits         3169     3164       -5     
- Misses        730      734       +4     
- Partials       95       96       +1     

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