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/panels/topbar/TopBar.tsx

@@ -13,9 +13,12 @@ import { useSitesmithModal } from '../../state/SitesmithContext';
 interface TopBarProps {
   device: DeviceMode;
   onDeviceChange: (device: DeviceMode) => void;
+  /** Item 10: canvas dashed guide outlines, default ON. */
+  showGuides: boolean;
+  onToggleGuides: () => void;
 }
 
-export const TopBar: React.FC<TopBarProps> = ({ device, onDeviceChange }) => {
+export const TopBar: React.FC<TopBarProps> = ({ device, onDeviceChange, showGuides, onToggleGuides }) => {
   const { whpConfig, isWHP } = useEditorConfig();
   const { actions, query, canUndo, canRedo } = useEditor((_state, query) => ({
     canUndo: query.history.canUndo(),
@@ -148,6 +151,16 @@ export const TopBar: React.FC<TopBarProps> = ({ device, onDeviceChange }) => {
             </button>
           ))}
         </div>
+        <button
+          type="button"
+          className={`topbar-btn guides-toggle icon-only${showGuides ? ' active' : ''}`}
+          onClick={onToggleGuides}
+          aria-pressed={showGuides}
+          aria-label={showGuides ? 'Hide canvas guides' : 'Show canvas guides'}
+          data-tooltip={showGuides ? 'Hide guides' : 'Show guides'}
+        >
+          <i className={`fa ${showGuides ? 'fa-th' : 'fa-th-large'}`} aria-hidden />
+        </button>
       </div>
 
       <div className="topbar-right">
@@ -161,10 +174,15 @@ export const TopBar: React.FC<TopBarProps> = ({ device, onDeviceChange }) => {
         <button className="topbar-btn" title="Templates" aria-label="Templates" onClick={() => setTemplateModalOpen(true)}>
           <i className="fa fa-th-large" /> Templates
         </button>
-        <button className="topbar-btn" title="Custom Head Code" aria-label="Custom Head Code" onClick={() => setHeadCodeModalOpen(true)}>
-          <i className="fa fa-code" /> Code
+        <button
+          className="topbar-btn icon-only"
+          aria-label="Custom Head Code"
+          data-tooltip="Code"
+          onClick={() => setHeadCodeModalOpen(true)}
+        >
+          <i className="fa fa-code" />
         </button>
-        <button className="topbar-btn" title="Preview" aria-label="Preview" onClick={() => {
+        <button className="topbar-btn icon-only" aria-label="Preview" data-tooltip="Preview" onClick={() => {
           try {
             const serialized = query.serialize();
             import('../../utils/html-export').then(({ exportToHtml, exportBodyHtml }) => {
@@ -218,7 +236,7 @@ export const TopBar: React.FC<TopBarProps> = ({ device, onDeviceChange }) => {
             console.error('Preview failed:', e);
           }
         }}>
-          <i className="fa fa-eye" /> Preview
+          <i className="fa fa-eye" />
         </button>
 
         {/* Draft/Published status badge */}