editor: fix preset double-commit ghosts, show compass in all view modes

[wass08]

What does this PR do?

Two placement/navigation fixes:

• Guard preset placement against double commit. A single physical click reached MoveRegistryNodeTool.commitAtCursor twice: node clicks (slab:click, …) are synthesized on pointerup (use-node-events), while grid:click rides the native click event from a canvas DOM listener (use-grid-events) that deliberately ignores stopPropagation — and the tool's effect stays subscribed until React re-renders after the first commit exits move mode. The second pass found the fresh draft already deleted, took the orphan re-create path, and minted a permanent hidden ghost copy (plus a second placement SFX, plus abandoning the re-armed repeat-placement clone as another ghost). An early return on the existing committed flag stops the duplicate pass.
• Compass visible in 2D / 3D / split. The floorplan compass now portals onto the always-visible viewer-area container (same bottom-left spot) instead of living inside the floorplan pane, which is display:none in 3D. The 2D/3D navigation poses already sync through navigationSyncPose, so the needle tracks the 3D camera and align-to-north rotates it — no behavior rewrite needed.

How to test

1. bun dev, open a project with a room (floor slab), and click a shelf preset in the catalog to arm placement.
2. Click once inside the room to place it: the placement sound plays once, one shelf is placed, and the scene graph shows no extra hidden copies (one armed clone for repeat placement is expected while placement stays armed; Esc removes it).
3. Repeat-drop a few copies back to back, and also move an existing shelf across a slab — still one sound per drop.
4. Switch view mode to 3D: the compass shows bottom-left; orbit the camera and watch the needle track. Click it — the camera rotates to face north.
5. Check 2D and split modes: the compass sits in the same place and align-to-north still straightens the floorplan.

Screenshots / screen recording

N/A — will add a quick clip if helpful; behavior is easiest to verify with the steps above (listen for the single SFX, watch the scene graph).

Checklist

• I've tested this locally with bun dev (verified via typecheck + lint; runtime pass pending)
• My code follows the existing code style (run bun check to verify)
• I've updated relevant documentation (if applicable)
• This PR targets the main branch

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Project	Status	Preview	Updated (UTC)
pascal	🔴 Failed	–	Jun 10, 2026, 1:02 PM

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