Image Conveyor v1.2.0

Adds deterministic multi-image execution groups while preserving the existing single-image workflow and output indices.

Multi-image execution groups

Adds Images per execution with a range of 1 through 9; the default remains 1.
Appends image_2 through image_9 after the existing six outputs, so saved links to the original outputs keep their indices.
Reserves complete ordered image groups at queue time so rapidly queued prompts do not overlap.
Keeps Don't consume reusable: unchanged queues return the same ordered group again.
Treats repeated queue entries that reference the same physical file as distinct logical images by queue-entry ID.
Rejects incomplete or stale reservations with readable validation errors instead of repeating/filling images.
Loads each selected image independently without stacking, resizing, padding, or forcing matching geometry.
Makes remaining-pending counts, auto-queue arithmetic, backend deltas, and cache identity group-aware.

Fixes the remaining Conveyor/Input Folder scroll-position regression caused by scrollbar-induced clientWidth changes being mistaken for real node resizes.
Keeps the independently stored scroll position for each browser tab while preserving identity re-anchoring for genuine node-width changes.

State schema remains version 1; workflows without images_per_execution normalize to 1.
Existing output slots 0 through 5 remain unchanged.
Legacy single-item queue reservations and singular backend delta fields remain supported.
ImageConveyor and the legacy SequentialBatchImageLoader alias continue to use the same node class.