No error boundary anywhere, one bad render kills the whole app with a white screen

[avinxshKD]

Any render-time error kills the whole UI. No boundary, no fallback, just a blank page and lost unsaved work.

Also local storage encoding is brittle (btoa), non-latin text/emoji in labels can blow autosave.
HTTP layer error handling is also weak: fetch failures bubble weirdly, and some reject paths pass unresolved body promises, so catches don’t get useful messages.

repro:

• create/edit graph with emoji/non-latin label, trigger autosave

• drop network, do server push/pull

• corrupt one saved graph entry in localStorage and reload

expected: app should degrade gracefully: fallback UI, proper error messages, and safe unicode/local storage handling.

[avinxshKD]

@pradeeban pls assign if its worth working on