fix: Correctly update version metadata when setting a value for the first time

[aklinker1]

Overview

Addresses the issues around updating a storage item's version when setting values and preventing excessive migrations when unnecessary.

Manual Testing

See unit tests. To try it out in your extension, see #2139 (comment).

Related Issue

This closes #1775
This closes #2130
Confirm that the test created in #1774 also passes with these changes.

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@wxt-dev/unocss

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commit: 59c6d11

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.15%. Comparing base (9dea0cf) to head (59c6d11).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2139      +/-   ##
==========================================
- Coverage   76.37%   76.15%   -0.22%     
==========================================
  Files         113      113              
  Lines        3031     3045      +14     
  Branches      680      683       +3     
==========================================
+ Hits         2315     2319       +4     
- Misses        633      641       +8     
- Partials       83       85       +2     

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[42willow]

thanks for this ❤️
i've tested and it works with my extension 👍