Add job reuse, pause/resume, and delete actions

Nameru Thaparequested to merge
feature/job-reuse-and-delete into main

Summary

Implements Feature: reuse, pause/resume, and delete actions across Production Jobs, Instruction Photos, and Station Inventory.

Job Lifecycle

  • Draft: can be Reused or Deleted from the Existing Jobs list; Activate Job button lives inside the job detail page.
  • Active: cannot be reused or deleted from the list (list shows "Open job to pause" instead); Pause Job button appears inside the job detail page.
  • Paused: behaves like Draft again — Reuse and Delete are available on the list; Resume Job button appears inside the job detail page. Kiosk scanning is blocked while paused.
  • Completed: can be Reused or Deleted from the list; no manual state-change button (completion happens automatically once all product units finish).

New Actions

  • Reuse a job: duplicates name, quantity, threshold, and all steps/required parts into a new Draft job. Auto-increments the name (" 1", " 2", ...) if the base name is already taken. Original job is untouched.
  • Delete a job: blocked only while Active. Cleans up ProductUnit, UnitStepProgress, and TransferRequest rows before deleting the job (cascades to JobStep/StepPart). Never touches the global Part or InstructionPhoto library.
  • Delete a photo: blocked if referenced by a step belonging to an Active job; otherwise removes the InstructionPhoto record and its file from disk.
  • Delete a station inventory part: blocked if required by a step of an Active job at that station; removes only the StationInventory link, not the global Part catalog entry.
  • Pause a job: Active -> Paused, preserves all production progress.
  • Resume a job: Paused -> Active, no re-activation logic re-run.

UX

Blocked deletions re-render the same page with an inline error banner instead of a generic Flask error page. Destructive actions (Delete Job, Delete Photo, Delete Station Part) require a browser confirmation prompt before submitting.

Testing

All 56 existing automated tests pass unchanged. Manually verified: reuse/delete/pause/resume across all four job statuses, photo deletion blocking for Active-job references, station inventory deletion blocking for Active-job requirements, and kiosk barcode scanning correctly rejecting Paused jobs.

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