Starting a measurement could pop "Error: Unknown error" in the browser
even though the device started recording fine. Two causes: the proxy's
10s timeout was shorter than a real device start over cellular, and on
an httpx timeout str(e) is empty, so the relayed detail was "" -> the
frontend's `result.detail || 'Unknown error'` rendered "Unknown error".
- Raise the control proxy timeout to 30s so a healthy start isn't cut off.
- Surface SLMM's own error detail on non-200 responses.
- Add an explicit, honest timeout message.
- Never return an empty detail (which rendered as "Unknown error").
Pairs with the SLMM-side fix that makes /start confirm promptly.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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