feat(admin): Add submission type filter dropdown

[ScuttleBot]

Summary

Replace the 'Official only' checkbox with a dropdown filter that allows filtering submissions by type:

• All submissions (default)
• Official only
• Unofficial only

Changes

• Updated /admin/api/submissions endpoint to accept official=false in addition to official=true
• Changed the submissions toolbar from a checkbox to a dropdown selector
• Reuses the existing page-size-selector styling for consistency with other dropdowns

Screenshots

The new filter matches the pattern already used in the Graphs section (submissions per day filter).

Testing

• Filter defaults to 'All submissions'
• Selecting 'Official only' shows only submissions where official=1
• Selecting 'Unofficial only' shows only submissions where official=0
• Pagination works correctly with all filter states
• Empty state messages reflect current filter selection

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	api	29e6f86	Commit Preview URL Branch Preview URL	Mar 19 2026, 12:19 PM

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

The changes are clean and consistent with existing patterns in the codebase. The new submission type filter dropdown mirrors the exact same approach already used for the submissions-per-day graph filter (both backend and frontend). Key observations:

• No SQL injection risk: officialWhere is built from hardcoded strings based on strict equality checks — user input is never interpolated into SQL.
• Proper URL encoding: encodeURIComponent is correctly applied to the filter value in the frontend.
• Consistent UX: The dropdown reuses page-size-selector styling and follows the same filter pattern used elsewhere in the admin UI.
• Correct empty state handling: The empty state message logic properly accounts for the new filter.

Files Reviewed (2 files)

• src/routes/admin.ts - 0 issues
• src/templates/adminHtml.ts - 0 issues

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_{Reviewed by claude-4.6-opus-20260205 · 252,735 tokens}