- health_check: use evershelf.db (not dispensa.db); auto-migrate if needed
- removed dispensa.db (legacy, obsolete)
- backups check: verify files exist (not dir writability, cron writes as root)
- bring_token: read data/bring_token.json (not env var)
- warning popup: 5s countdown bar with label+hint per warning, auto-closes
- error popup: blocking panel with title + hint per critical failure
- db_legacy check: warns if old dispensa.db still present
- 32 total checks (added db_legacy, tts_url, scale_gateway)
- hint messages on every check explaining cause and fix
- translations: added check_db_legacy, check_tts, check_scale,
critical_error_intro, error_network_detail in it/en/de
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