Fix case-sensitive sorting of filter values in Issues page (Vibe Kanban)

[cteyton]

Summary

The filter dropdowns (Repository, Evaluator) in the Issues page were sorting values using JavaScript's default .sort(), which performs case-sensitive comparison. This caused uppercase entries (e.g., "PostHog/posthog") to appear before lowercase ones (e.g., "bigint/hey"), resulting in an unintuitive ordering for users.

Changes

• File: src/api/routes/issues.ts
• Replaced .sort() with .sort((a, b) => a.localeCompare(b, undefined, { sensitivity: "base" })) for both evaluators and repositories filter arrays
• This applies case-insensitive locale-aware sorting, so entries like "bigint/hey" and "Checkmk/checkmk" are interleaved alphabetically regardless of casing

Why

The previous case-sensitive sort grouped all uppercase-starting names before lowercase ones, making it harder for users to find repositories and evaluators in the filter dropdowns. Case-insensitive sorting matches user expectations for alphabetical lists.

Implementation details

• The fix is backend-only — the frontend already renders filter values in the order received from the API
• Uses localeCompare with sensitivity: "base" which ignores both case and diacritics for sorting
• Hardcoded filters (Severity: High/Medium/Low, Issue Type: Errors/Suggestions) were already in logical order and required no changes

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This PR was written using Vibe Kanban