fix(web): accept case-insensitive VS Code color functions

[jonbaldie]

What Changed

Accept uppercase and mixed-case CSS color() function names when importing VS Code themes, with a focused regression test.

Why

The importer’s dispatch guard was case-sensitive even though its color() parser accepts case-insensitive syntax. A valid theme using COLOR(SRGB …) was rejected as missing an editor background.

UI Changes

Not applicable.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Model and harness: GPT-5 Codex.

Note

Fix case-insensitive color() parsing in parseVsCodeColor

Updates parseVsCodeColor in vscodeThemeImport.ts to use a case-insensitive regex for CSS color() notation instead of startsWith("color("). This fixes parsing of theme values using uppercase variations like `COLOR(SRGB ...)", and adds a corresponding test case.

^{Macroscope summarized cbfa0f2.}

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[macroscopeapp]

Approvability

Verdict: Approved at de6184f

Macroscope's review found this PR approvable — This PR adds stricter validation for CSS color() function parsing in VS Code theme imports - rejecting malformed notation and supporting case-insensitive function names. The changes are self-contained with corresponding tests and don't affect behavior for valid inputs.

^{You can add or adjust custom eligibility rules. Learn more.}

Dismissing prior approval to re-evaluate de6184f