[6.x] Image cropping

[jackmcdade]

Uses cropper.js to add a new image crop feature, complete with aspect ratio and orientation flipping.

When finished cropping you can choose to save as a new image or replace the existing one.

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Note

Medium Risk
Adds a new client-side crop + upload/overwrite flow for assets and changes ConfirmationModal cancel semantics, which could impact asset replacement behavior and other consumers relying on cancel events.

Overview
Adds an image cropping feature in the asset editor using cropperjs, including a new full-screen CropEditor with aspect-ratio presets, orientation flipping, and keyboard shortcuts.

Wires cropping into Editor.vue via a new Crop toolbar action and a confirmation step that uploads the cropped file either as a new copy (timestamped) or by overwriting the original, including cache-busting reload behavior when replacing.

Updates ConfirmationModal to distinguish explicit cancel-button clicks via a new cancel-clicked event (while still emitting cancel on any close), and adds a new crop icon plus the cropperjs dependency (and lockfile entries).

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