fix(results-panel): guard Recharts 0-width canvas crash on admin panel open

[sacha-l]

Summary

• Adds debounce={50} and style={{ minWidth: 1 }} to ResponsiveContainer in FeedbackChart inside ProgramResultsSummarySection

Root cause

When the admin wallet unlocks and the completed-program results panel expands, the CSS layout transition means ResponsiveContainer fires its first ResizeObserver tick with width=0. Recharts then attempts to create a Canvas gradient pattern on a 0×0 canvas:

Uncaught InvalidStateError: Failed to execute 'createPattern' on
'CanvasRenderingContext2D': The image argument is a canvas element
with a width or height of 0.

debounce={50} defers the first measurement by 50ms so the layout settles first. minWidth: 1 is a belt-and-suspenders guard.

Why it didn't catch in testing

• stadium-tester runs in mock mode — admin panel is already visible before data loads, no layout transition, chart always gets non-zero width on first render
• Console error gate in the Playwright spec only fails when an expect() assertion fails; this error fires during mount, not tied to any UI state assertion
• No post-deploy smoke test catches JS exceptions on the production build

Companion CORS error (no code change needed)

The console also showed No 'Access-Control-Allow-Origin' header on GET /api/programs/bitrefill-2026. That was a transient Railway container-swap gap during deploy — old container down before new one was serving. Server is healthy; stadium.joinwebzero.com is in the explicit CORS allowlist.

Test plan

• Unlock admin wallet on bitrefill-2026 in production, open the completed program → feedback charts render with no console errors
• cd client && npm run build passes ✓ (verified pre-PR)

Fixes prod regression introduced by #195.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
stadium	Ready	Preview, Comment	Jun 25, 2026 5:28pm