feat: add error boundary for crash recovery

[EmeditWeb]

Problem

If any component throws an uncaught error the
entire app goes blank with no recovery option.

What To Build

Create src/components/ErrorBoundary.tsx:
A React class component error boundary that catches
render errors and shows a fallback UI with a
Reload Page button.

Wrap the root Router in ErrorBoundary.
Also wrap each page individually so one page
crash does not break the whole app.

Files To Touch

• src/components/ErrorBoundary.tsx (new)
• src/main.tsx

Acceptance Criteria

• Error boundary catches render errors
• Fallback UI shows with Reload button
• Error details logged to console
• Other pages still work after one crashes

Mandatory Checks Before PR

• npm run build passes
• PR references this issue

[Mmesolove]

Hi Maintainer, I’ve gone through the issue details and I’m confident I can work on and resolve it. Kindly assign this issue to me. I’ll be glad to contribute. Thanks!