BL-15958 Edit mode: trim-only view with bleed guides and crop marks on hover

[hatton]

[Claude Fable 5 following a prompt from Hatton]

Part 3 of 3 of the updated BL-15958 work, split out of #7713.

Tracker: BL-15958

What this does

Changes only editMode.less. In edit mode, full-bleed pages now show the trimmed view by default (clip-path: inset(3mm)). Hovering a page reveals the bleed band, the safety-area strips, and white crop marks at the trim corners. Master's exclusions for the Ebook2x3Portrait and Ebook7x5Landscape layouts are preserved.

Relationship to the other parts

Independent of the other two PRs; based on master. The siblings are the edge-to-edge theme PR (#8262) and the full-bleed page-size PR (#8263).

Verification

• vite build passes.

🤖 Generated with Claude Code

Devin review

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This change is 

[greptile-apps]

Greptile Summary

Updates edit-mode styling for full-bleed print layouts.

• Clips the default view to the trimmed page boundary.
• Reveals the bleed band and safety-area guides while hovering the page.
• Adds crop marks at each trim corner and preserves exclusions for scrolling device and ebook layouts.

Important Files Changed

Filename	Overview
src/BloomBrowserUI/bookEdit/css/editMode.less	Adds trim-only clipping and hover-revealed bleed, safety, and crop-mark styling; no actionable defect was identified.

_{Reviews (1): Last reviewed commit: "BL-15958 Show trim-only view in edit mod..." | Re-trigger Greptile}