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/Canvas.tsx

@@ -8,6 +8,8 @@ import { exportBodyHtml } from '../utils/html-export';
 
 interface CanvasProps {
   device: DeviceMode;
+  /** Item 10: when false, applies `.guides-off` to hide the dashed drop-target guides. */
+  showGuides: boolean;
 }
 
 /**
@@ -120,7 +122,7 @@ export const EmptyCanvasHint: React.FC = () => {
   );
 };
 
-export const Canvas: React.FC<CanvasProps> = ({ device }) => {
+export const Canvas: React.FC<CanvasProps> = ({ device, showGuides }) => {
   const width = DEVICE_WIDTHS[device];
   const { isEditingHeader, isEditingFooter, headerPage, footerPage } = usePages();
 
@@ -137,7 +139,7 @@ export const Canvas: React.FC<CanvasProps> = ({ device }) => {
   return (
     <div className="editor-canvas">
       <div
-        className="canvas-device-frame"
+        className={`canvas-device-frame${showGuides ? '' : ' guides-off'}`}
         style={{
           width,
           maxWidth: '100%',