RobbStarkAustria d6090a6179 fix(screenshots): harden event-triggered MQTT screenshot flow and cleanup docs ...

- fix race where periodic captures could overwrite pending event_start and event_stop metadata before simclient published
- keep latest.jpg and meta.json synchronized so triggered screenshots are not lost
- add stale pending trigger self-healing to recover from old or invalid metadata states
- improve non-interactive capture reliability with DISPLAY and XAUTHORITY fallbacks
- allow periodic idle captures in development mode so dashboard previews stay fresh without active events
- add deeper simclient screenshot diagnostics for trigger and metadata handling
- add regression test script for metadata preservation and trigger delivery
- add root-cause and fix documentation for the screenshot MQTT issue
- align and deduplicate README screenshot and troubleshooting sections; update release notes to March 2026
- fix scripts/start-dev.sh .env loading to ignore comments safely and remove export invalid identifier warnings

2026-03-29 10:38:29 +02:00

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