Replace direct `crypto.randomUUID()` calls in the web dashboard with a
`generateUUID()` utility that falls back to a manual UUID v4 implementation
using `crypto.getRandomValues()` when `randomUUID` is unavailable (older
Safari, some Electron builds, Raspberry Pi browsers).
Closes#3303Closes#3261
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
