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Two legibility fixes for the canvas z-order menu, from user feel-testing: - z-only commits no longer remount the preview iframe. The commit hook already applies the inline z (+ injected position) to the live elements and updates the store synchronously; the post-commit reloadPreview() was a redundant full remount that read as a canvas 'blink' on every action. commitDomEditPatchBatches gains skipReload, engaged only when provably safe: every op is an inline-style patch AND the server reports every patch matched — anything else falls back to the reload so the preview reconverges with disk. The file-watcher's own reload stays suppressed by the existing domEditSaveTimestampRef window, so the skip is real. - Bring Forward / Send Backward step over the next VISIBLY overlapping sibling. The nearest z-neighbor in a composition is often invisible at the current frame (runtime hides time-inactive clips with inline visibility/display; GSAP parks elements at opacity 0), so the step crossed something the user couldn't see — 'enabled but nothing happens'. The forward/backward set now filters on element-level computed visibility (display/visibility/opacity, injectable for tests); enable/disable shares the resolver so the menu is honest: actions disable when no visible neighbor exists. Front/back keep the full painting family. - The neighbor that was stepped over gets a 600ms accent flash, drawn in the studio overlay layer (never in the iframe DOM), so the action shows its work.