fix(analytics): change method return types from void to Promise<void>

[muhammedaksam]

Overview

The Analytics interface declared track(), page(), identify(), and setEnabled() as returning void. The background implementation is async so it actually returns Promise<void>, but the frontend implementation returns void. TypeScript allows Promise<void> to be assigned to void (no error on the background side), but users calling await analytics.track() see TS80007 because the declared return type is void.
Changed the interface return types to Promise<void> and updated the MethodForwarder type and frontend implementation accordingly.

Manual Testing

1. Use await analytics.track(...), await analytics.page(...), await analytics.identify(...), or await analytics.setEnabled(...) in a WXT project using this analytics module — TS80007 should no longer appear
2. Call the same methods without await — they should still work in both background and frontend contexts
3. Verify the build passes: bun run --filter @wxt-dev/analytics build

Related Issue

This PR closes #2408

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[PatrykKuniczak]

Nice catch.

Thanks

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commit: 9643667

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.49%. Comparing base (8cb973c) to head (9643667).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2409      +/-   ##
==========================================
+ Coverage   78.41%   78.49%   +0.07%     
==========================================
  Files         133      133              
  Lines        3882     3882              
  Branches      875      875              
==========================================
+ Hits         3044     3047       +3     
+ Misses        749      747       -2     
+ Partials       89       88       -1     

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