feat(builder): items 10+12+13 — scope canvas guides, Show Guides toggle, Layers panel hover/icons, topbar unification

Item 10: dashed canvas "guide" outlines were applied via blanket tag
selectors (div/section/header/...), so a finished section showed 3-4
nested dashed boxes. RenderNode.tsx (the <Editor onRender> override) now
tags each Craft.js droppable container's real DOM node with a
`data-craft-node` attribute (node.data.isCanvas, excluding ROOT), and
editor.css's guide rules target that attribute instead — a component's own
internal wrapper markup is no longer mistaken for a drop target. Added a
"Show guides" topbar toggle (default ON, persisted to localStorage),
state lifted in EditorShell.tsx (mirrors how `device` is already lifted),
flips `.guides-off` on Canvas.tsx's `.canvas-device-frame`.

Item 12: Layers panel rows get per-type FA icons (keyed off the same
craft.displayName used for the row label, seeded from BlocksPanel's
choices), indent-guide lines connecting nested rows, and row hover
highlights the matching canvas element (`data-layer-hovered`, written
directly to the node's DOM via `query.node(id).get().dom` — NOT via
`actions.setNodeEvent`, which is stripped from useEditor()'s public
`actions` at runtime, not just in its TS type, and threw when called).

Along the way, Craft.js's own connect() was found to already wire mouse
hover to the same `hovered` node event internally (previously invisible
because the matching CSS was dead) — RenderNode now also mirrors that
onto `data-craft-hovered` for a real-mouse-hover canvas highlight, and
both hover attributes plus the guide attribute are suppressed under
`.guides-off` so the toggle stays airtight.

Item 13: unified the topbar to one button radius (`.topbar-btn` 20px pill
-> var(--radius-md)), demoted Code/Preview to icon-only with
`data-tooltip`. Fixed a latent bug the new tooltips exposed: `[data-tooltip]`
tooltips render above their trigger, but the topbar has no room above it
(`body { overflow: hidden }`) — added a `.topbar` override to render
those below instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

craft/src/editor/EditorShell.tsx

@@ -9,8 +9,34 @@ import { useContextMenu } from '../hooks/useContextMenu';
 import { useKeyboardShortcuts } from '../hooks/useKeyboardShortcuts';
 import { DeviceMode } from '../types';
 
+const SHOW_GUIDES_STORAGE_KEY = 'craft-show-guides';
+
+function loadShowGuides(): boolean {
+  try {
+    const stored = window.localStorage.getItem(SHOW_GUIDES_STORAGE_KEY);
+    return stored === null ? true : stored === '1';
+  } catch {
+    return true;
+  }
+}
+
 export const EditorShell: React.FC = () => {
   const [device, setDevice] = useState<DeviceMode>('desktop');
+  // Item 10: canvas dashed "guide" outlines toggle -- default ON, persisted
+  // so the choice survives a reload. Lifted here (rather than owned by
+  // TopBar or Canvas alone) because the toggle button lives in TopBar but
+  // the `.guides-off` class it drives is applied to Canvas's
+  // `.canvas-device-frame`, mirroring how `device` is already lifted for
+  // the same reason.
+  const [showGuides, setShowGuidesState] = useState<boolean>(loadShowGuides);
+  const setShowGuides = useCallback((next: boolean) => {
+    setShowGuidesState(next);
+    try {
+      window.localStorage.setItem(SHOW_GUIDES_STORAGE_KEY, next ? '1' : '0');
+    } catch {
+      // Storage unavailable (private browsing, etc.) -- in-memory state still works.
+    }
+  }, []);
   const { menuState, show: showMenu, hide: hideMenu } = useContextMenu();
   const { query } = useEditor();
 
@@ -34,11 +60,16 @@ export const EditorShell: React.FC = () => {
 
   return (
     <div className="editor-app">
-      <TopBar device={device} onDeviceChange={setDevice} />
+      <TopBar
+        device={device}
+        onDeviceChange={setDevice}
+        showGuides={showGuides}
+        onToggleGuides={() => setShowGuides(!showGuides)}
+      />
       <div className="editor-container">
         <LeftPanel />
         <div onContextMenu={handleContextMenu} style={{ flex: 1, display: 'flex', minWidth: 0 }}>
-          <Canvas device={device} />
+          <Canvas device={device} showGuides={showGuides} />
         </div>
         <RightPanel />
       </div>