Improve run creation workflow with filters, local box art, and sticky nav

Use local /boxart/{slug}.png images instead of database boxArtUrl with
color-swatch fallback. Add region filter pills and run-status checkboxes
(hide active/completed) to GameGrid. Move the Next button into a sticky
top bar showing selected game summary so it's always visible. Capitalize
region names in all display locations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-o7il--improve-run-creation-workflow-ux.md

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+---
+# nuzlocke-tracker-o7il
+title: Improve run creation workflow UX
+status: completed
+type: feature
+priority: normal
+created_at: 2026-02-07T20:26:26Z
+updated_at: 2026-02-07T20:27:46Z
+---
+
+Box art from local files, capitalize regions everywhere, add region filter + run-status filters to GameGrid, sticky top bar with selected game summary + Next button in NewRun step 1.
+
+## Checklist
+- [ ] GameCard: box art from /boxart/{slug}.png with color fallback, capitalize region
+- [ ] GameGrid: add runs prop, region filter pills, run-status checkboxes, capitalize regions
+- [ ] NewRun: add useRuns(), pass runs to GameGrid, sticky top bar with game summary + Next button
+- [ ] RunEncounters: capitalize region display
+- [ ] RunDashboard: capitalize region display
+- [ ] AdminGameDetail: capitalize region display
+- [ ] NewRun step 3 summary: capitalize region display
+- [ ] Verify: npx tsc --noEmit clean compile