possible fix for recording issue

[PL00T00]

Summary

Surface Linux/browser screen-capture failures instead of silently bouncing the user back into the source-selection flow.

Why

On some Linux Chromium setups, the user can complete the source picker but the browser never hands the app a usable stream, or the stream ends immediately. The previous flow made that look like an infinite loop back to the picker.

This matches the reported Arch/Linux behavior much better than a pure user-gesture issue.

Change

• surface browser screen-capture failures on the mode selector instead of silently restarting
• treat deliberate screen-picker cancellation separately from real capture failure
• preserve the specific failure reason so the UI can warn the user and steer them toward Desktop
• show inline camera-start errors instead of lumping them into the same silent restart path

Verification

• ran npx pnpm --filter @lapse/lapse-client check-types