fix: sort firmware version dropdown by semver instead of date

[pfeerick]

Summary

• The firmware version dropdown (CloudBuild and GitHub tabs) sorted releases by publish date, which interleaves versions whenever a patch is published for an older minor branch after a newer minor already exists (e.g. v2.11.6 shows up after v2.12.0).
• Adds a shared compareFirmwareReleases semver comparator (src/shared/firmwareVersions.ts) and uses it in both CloudFirmwareReleasesPicker.tsx and FirmwareReleasesPicker.tsx. Non-semver ids like "nightly" always sort first.

Test plan

• Added unit tests in src/shared/__tests__/firmwareVersions.spec.ts covering the interleaved-order bug, nightly pinning, prerelease ordering, and edge cases
• Existing FlashingWizard integration tests still pass
• tsc --noEmit and eslint clean on changed/new files

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 36.34%. Comparing base (9cbe78d) to head (57ecbba).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/shared/firmwareVersions.ts	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #154      +/-   ##
==========================================
+ Coverage   36.25%   36.34%   +0.08%     
==========================================
  Files         115      116       +1     
  Lines        4281     4287       +6     
  Branches     1034     1037       +3     
==========================================
+ Hits         1552     1558       +6     
+ Misses       2523     2522       -1     
- Partials      206      207       +1     

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[github-actions]

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