No ErrorBoundary anywhere, render error = white screen

p5.js version

No response

What is your operating system?

None

Web browser and version

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There's no ErrorBoundary component anywhere in the client. Any unhandled
render error kills the entire app with a white screen. No fallback, no
message, nothing.

Especially bad around the Editor (805-line class component doing CodeMirror
DOM stuff) and IDEView. Users just lose their session with zero feedback.

Steps to reproduce:

1. Throw an error inside any component during render
2. Entire app dies, white screen
3. No way to recover without a full page reload

Expected: Some fallback UI. Even just "Something went wrong, go back home."
Actual: Blank page.

Fix involves:

• Add ErrorBoundary component with componentDidCatch + fallback UI
• Wrap route-level components in routes.jsx (IDE, Dashboard, Preview)

Filed against client/routes.jsx and client/modules/App/App.tsx