feat(editor): preset-system polish — paint panel, slim action bar, icon rail (#354)

* feat(editor): preset-system polish — paint panel, slim action bar, icon rail

- Export `MaterialPaintPanel` so embedders host the paint material picker in
  their own panel (community docks it in the Build sidebar) instead of the
  bottom action bar.
- ActionMenu: drop the build / material-paint / furnish modes and the
  structure-tools palette row + paint tray (the host's Build sidebar owns
  building now). Reduce `structure-tools` to the shared `tools` lookup still
  used by cursor/floorplan indicators; remove the orphaned `useContextualTools`.
- MaterialPicker: swatches wrap into a fluid `auto-fill` grid that fills width.
- IconRail (tab-bar): bigger icons, grayscale-when-idle, Radix tooltip, w-14
  rail; sync `RAIL_WIDTH` to 56.
- Inspector footer: hand the host `footer` to kind-owned custom panels via
  `InspectorFooterContext` so the save button renders without per-kind wiring.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore: biome format pass

Whole-repo formatter normalization (line wrap/unwrap only, no logic changes)
surfaced by the format-on-edit hook against prior drift. Kept separate from the
feature commit so the preset-system diff stays reviewable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

packages/nodes/src/roof-segment/definition.ts

@@ -3,15 +3,15 @@ import {
   getPitchFromActiveRoofHeight,
   type HandleDescriptor,
   type NodeDefinition,
-  type RoofSegmentNode as RoofSegmentNodeType,
   RoofSegmentNode as RoofSegmentNodeSchema,
+  type RoofSegmentNode as RoofSegmentNodeType,
 } from '@pascal-app/core'
+import { buildRoofSegmentFloorplan } from './floorplan'
 import {
   roofSegmentMoveTarget,
   roofSegmentResizeAffordance,
   roofSegmentRotateAffordance,
 } from './floorplan-affordances'
-import { buildRoofSegmentFloorplan } from './floorplan'
 import { roofSegmentParametrics } from './parametrics'
 import { RoofSegmentNode } from './schema'
 

packages/nodes/src/roof-segment/floorplan-affordances.ts

@@ -154,11 +154,7 @@ export const roofSegmentMoveTarget: FloorplanMoveTarget<RoofSegmentNode> = ({ no
   // is `[cosRoof, sinRoof; -sinRoof, cosRoof]`. Used to project world cursor
   // back into roof-local coords.
   void roofRot
-  let lastLocal: [number, number, number] = [
-    node.position[0],
-    node.position[1],
-    node.position[2],
-  ]
+  let lastLocal: [number, number, number] = [node.position[0], node.position[1], node.position[2]]
 
   return {
     affectedIds: [segmentId],