fix(app): resolve grain art avatars in electron builds

[benjaminshafii]

Summary

• Resolve static grain art avatar URLs against Vite's build base instead of the filesystem root
• Keeps dev URLs root-relative while Electron packaged builds use relative file URLs

Root Cause

• The static avatar helper returned /grain-art/...
• Dev runs from http://localhost:5173, so that resolves to http://localhost:5173/grain-art/... and loads
• Production Electron loads the renderer from file://.../dist/index.html, so /grain-art/... resolves to file:///grain-art/... and fails

Testing

• pnpm --filter @openwork/desktop build: passed
• pnpm --filter @openwork/app typecheck: passed
• CDP inspection before fix: /grain-art/workspaces/workspaces-001.png resolved to file:///grain-art/workspaces/workspaces-001.png and fetch failed
• CDP inspection of dev: same path resolved to http://localhost:5173/grain-art/workspaces/workspaces-001.png and returned 200
• CDP inspection of corrected relative production path: ./grain-art/workspaces/workspaces-001.png resolved under apps/app/dist and returned 200

No screenshot/video captured; this was verified through CDP URL/fetch inspection.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
openwork-app	Ready	Preview, Comment	May 27, 2026 3:38pm
openwork-den	Ready	Preview, Comment	May 27, 2026 3:38pm
openwork-den-worker-proxy	Ready	Preview, Comment	May 27, 2026 3:38pm
openwork-landing	Ready	Preview, Comment, Open in v0	May 27, 2026 3:38pm

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}