Improve editor placement and selection workflows

[Aymericr]

Summary

• add selection clipboard support across tabs and projects with ghost placement
• keep placement tools selectable and preview spawn objects before placement
• replace bulk-delete browser alerts with the editor confirmation dialog
• expose accepted canvas selections for hosted catalog synchronization
• harden clipboard races, preview layer isolation, and dialog cleanup

Verification

• bun test packages/editor/src/lib/scene-clipboard.test.ts packages/editor/src/lib/selection-routing.test.ts packages/editor/src/components/editor-2d/renderers/floorplan-registry-layer.test.ts packages/nodes/src/spawn/__tests__/parity.test.ts (43 pass)
• bun run check-types
• bun run build
• Biome checks on changed files
• git diff --check

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Note

Medium Risk
Clipboard and scene-graph delete/paste paths touch materials, hosted openings, and interaction scope; floorplan event routing changes selection timing around door/window placement.

Overview
Cross-tab copy/cut/paste now serializes scene nodes and referenced custom materials to the system clipboard (pascal.scene-nodes), waits on in-flight writes before paste, and places pasted content with click-to-carry (cursor-centered group move or door/window re-host flow). Cut mirrors copy roots then deletes them; group carry cancels on clipboard chords and handles paste material cleanup on escape.

Bulk delete swaps window.confirm for an in-editor DeleteConfirmationDialog (Zustand store); keyboard shortcuts are suppressed while it is open.

selection:canvas-node-click is emitted from 2D floorplan and 3D selection paths after a user click resolves to a single target—intended for hosts syncing catalogs without reacting to programmatic selection.

Floorplan opening placement no longer disables registry handlers at render time; isFloorplanOpeningPlacementState gates pointer/click at event time so post-placement selection is not lost in a dead zone after commit.

Spawn placement uses the real SpawnPreview model (ghost) with R/T rotation before commit, matching tool hints and parity tests.

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