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Phase B makes the Craft.js editor genuinely usable by touch on top of Phase A's responsive shell, gated entirely behind useIsMobile()/<=768px: - Extract useNodeActions(nodeId) out of ContextMenu.tsx (move/duplicate/ delete/select-parent), shared by the desktop right-click menu (behavior unchanged) and the new mobile MobileSelectionToolbar. - MobileSelectionToolbar: bottom-fixed selection toolbar (Move Up/Down, Duplicate, Select Parent, Edit Styles, two-tap Delete confirm), hidden while a sheet is open. - BlocksPanel: tap-to-add on mobile (insert after selection, close sheet, select + scroll the new node into view); desktop drag/double-click unchanged. - LayersPanel rows >=44px on mobile; HeadCodeModal portaled to document.body (same fix TemplateModal already had); BottomSheet gets swipe-to-dismiss and on-screen-keyboard clearance via a new useVisualViewportInsets hook. Also fixes two pre-existing bugs surfaced only by driving a real Craft.js document with Playwright touch input (masked by tests that mock @craftjs/core): regenerateTreeIds structuredClone'd a live node's whole data object, including the component function reference in data.type, throwing DataCloneError and silently breaking Duplicate/Paste for every node type; and an earlier useNodeActions draft cached canMoveUp/canMoveDown inside a useEditor collector closed over nodeId, which goes stale for one render whenever the selection changes without an unrelated store event. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>