fix: exclude open_in_tab from options_ui for Safari

[rxliuli]

Summary

• Safari does not support the open_in_tab key in options_ui. Including it causes safari-web-extension-converter to emit a warning: "The following keys in your manifest.json are not supported by your current version of Safari: open_in_tab"
• Conditionally set open_in_tab to undefined when building for Safari, following the same pattern used for browser_style (Firefox-only) and chrome_style (non-Firefox only)
• Added a test case for Safari options_ui generation

Test plan

• Existing manifest tests pass (91 tests)
• New test verifies open_in_tab is excluded for Safari
• Verified with wxt build -b safari that the output manifest no longer contains open_in_tab

[netlify]

❌ Deploy Preview for creative-fairy-df92c4 failed.

Name	Link
🔨 Latest commit	cb2664d
🔍 Latest deploy log	https://app.netlify.com/projects/creative-fairy-df92c4/deploys/69ef6c7b6ff1840007e20ba2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.81%. Comparing base (e75e534) to head (e2a960c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2311      +/-   ##
==========================================
+ Coverage   79.73%   79.81%   +0.08%     
==========================================
  Files         131      131              
  Lines        3804     3805       +1     
  Branches      861      862       +1     
==========================================
+ Hits         3033     3037       +4     
+ Misses        686      684       -2     
+ Partials       85       84       -1     

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commit: e2a960c

[aklinker1]

Looks like you have some type errors: https://github.com/wxt-dev/wxt/actions/runs/24995402536/job/73196741505?pr=2311

[rxliuli]

Looks like you have some type errors: https://github.com/wxt-dev/wxt/actions/runs/24995402536/job/73196741505?pr=2311

ref cb2664d