feat: add temp stop mode

[AlexKaravaev]

Add a mode that disables any ui for predefined period of time

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-21T11:27:57.476627Z	c0fbdf5	New commits

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[github-actions]

• [P2] Short sampling requests can expire without blanking any LEDs — ui/src/engine/diamond.rs:1114. The deadline starts when the event is handled, but black frames are only sent on the next 30 Hz rendering tick. A positive request shorter than ~33 ms can therefore expire before any black frame is sent; longer requests also lose part of their blackout interval. Start the duration when the blackout frame is emitted, and add coverage for requests arriving between ticks.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 6716d971aa

ℹ️ About Codex in GitHub

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• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

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[github-actions]

• [P2] Short blackout requests can expire without switching off any LEDs — ui/src/engine/diamond.rs:1114. The deadline starts when the event is handled, but black frames are only sent on the next 30 FPS tick. A duration_ms: 10 request arriving with 20 ms until that tick expires without ever blanking the LEDs, compromising the ambient-light sample. Start the duration when blackout output begins, and add a regression test for requests shorter than one frame interval.