feat: Log warnings once

[fkatsuhiro]

Overview

• Wrapped wxt.logger with createWxtLogger to add warnOnce (the Logger type itself stays unchanged)
• The dedup Set is created once in registerWxt and delegates through a closure that always reads the current wxt.config.logger
• State persists across reloadConfig(), so manifest.ts warnings no longer repeat on dev-server restarts

Manual Testing

warnOnce

• Calling it repeatedly with the same arguments logs to the underlying warn only once, on the first call, with those exact arguments
• Calling it with distinct arguments logs each one independently, once per distinct message
• Regular warn calls are unaffected by dedup — they always pass through to the underlying warn every time
• If the underlying logger instance is swapped out mid-life (simulating wxt.reloadConfig() replacing wxt.config.logger), the same message still isn't re-logged, while a genuinely new message is correctly delivered to the new underlying logger

delegation

• debug/ log / info / error / fatal / success are all passed straight through to the underlying logger
• Reading and writing level is reflected on the underlying logger

Related Issue

This PR closes #2507

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[aklinker1]

Looks good other than the callback setup you're using. It adds a bit of overhead every time wxt.logger is accessed - see comments for recommended changes

[fkatsuhiro]

Looks good other than the callback setup you're using. It adds a bit of overhead every time wxt.logger is accessed - see comments for recommended changes

Thank you for review this PR. Let me update it. Thank you.

[aklinker1]

I cleaned up the tests a little - mocked dependencies for the resolve-config.test.ts (e2e tests setup directories, not unit), and used mock instead of fully defining a fake logger instance. I also changed the logic to share the warn set between all instances of WxtLogger, not per-instance.

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commit: e6e318d

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 79.37%. Comparing base (186beab) to head (e6e318d).

Files with missing lines	Patch %	Lines
packages/wxt/src/core/resolve-config.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2536      +/-   ##
==========================================
+ Coverage   79.18%   79.37%   +0.19%     
==========================================
  Files         133      134       +1     
  Lines        3982     3996      +14     
  Branches      923      924       +1     
==========================================
+ Hits         3153     3172      +19     
+ Misses        733      729       -4     
+ Partials       96       95       -1     

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