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+- **Queue: batch (quantity>1) double-dispatched onto the same printer** — scheduling an ASAP print with `quantity > 1` could end up with two queue items in `'printing'` status for the same printer, surfaced in the logs as `BUG: Multiple queue items in 'printing' status for printer N`. The scheduler's in-memory `busy_printers` set was seeded empty each tick and only populated after `_start_print` succeeded in the current iteration, so on the next tick (30 s later) `_is_printer_idle()` read the printer's live MQTT state — which on H2D / P1 series lags several seconds behind the print command and still reported `IDLE` / `FINISH` — and dispatched the second batch item onto the already-running printer. `check_queue()` now queries `PrintQueueItem` for `status='printing'` rows and seeds `busy_printers` with their printer IDs before iterating pending items, so any printer with an outstanding dispatched job is excluded regardless of what MQTT currently reports. Regression covered in `test_phantom_print_hardening.py` (`TestBusyPrinterSeedingFromPrintingItems`): seeding query returns printers with `'printing'` rows only, returns empty when none exist, and end-to-end `check_queue()` does not call `_start_print` for a pending item whose printer already has a `'printing'` row even when `_is_printer_idle()` is forced `True`.
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+- **Queue: active-item progress bar flashed 100% before dropping to 0%** — immediately after a queue item was dispatched, the per-item progress bar on the Queue page showed 100% (or whatever the prior print's final `mc_percent` was) for the few seconds between dispatch and the printer's MQTT state transitioning to `RUNNING`. Frontend `QueuePage.tsx` read `status.progress` directly from the printer's live MQTT snapshot, which carries over the last reported value from the previous print until the new one starts ticking. The progress bar, remaining time, ETA, and layer counter are now gated on `status.state` being `RUNNING` or `PAUSE`; in any other state (including `FINISH` from the prior print, `IDLE`, or `PREPARE` while heating) the bar renders at 0% with no stale ETA/layer values.
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maziggy