Reject invalid extra_schedules with HTTP 400 before create or update reaches the task service. Preserve omitted, null and empty extras, supported cron syntax, and additional metadata.
Localize missing rules, invalid string and array types, and non-object extra entries through the existing per-request translation middleware. Cover POST/PUT rejection without mutations, dynamic English/Chinese switching, and stable error paths.
Validation: 9 related regression tests passed on current develop; backend build passed. The API validation fix also passed full regression and isolated develop/debian-dev acceptance.
Refs #3099
Download updates asynchronously with persistent progress and validate matching source and build artifacts before an explicit restart. Keep upgrade workers alive across service restarts, verify the new runtime, and recover the browser with a one-time success notice.
Publish immutable archive sizes and checksums for accurate download progress. Align the update dialog, hide unavailable actions during transfers, and show the sidebar notice only for active, ready or failed jobs. Constrain long account names with ellipsis while preserving avatar and collapse controls.
Translate UI, scheduler, validation, preload and maintenance messages dynamically, and propagate locale changes between workers. Harden update checks, downloads and terminal states, verify Debian pnpm, and ignore generated test artifacts.
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