refactor(builder): remove dead component settings UI

Each component defined a .craft.related.settings panel that was never
rendered -- the right panel renders only GuidedStyles (per-type
*StylePanel components), never .related.settings. Removed all dead
settings components across every component, their settings-only helpers
(including the dead uploadToWhp/showBrowser/handleBrowse asset-browse
blocks in Logo/Navbar/VideoBlock/FeaturesGrid, and CtasEditor in
_cta-helpers), and dropped the now-empty related keys. Render output,
.craft props/rules, and toHtml statics are unchanged.

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

craft/src/components/basic/Spacer.tsx

@@ -33,51 +33,6 @@ export const Spacer: UserComponent<SpacerProps> = ({
   );
 };
 
-/* ---------- Settings panel ---------- */
-
-const SpacerSettings: React.FC = () => {
-  const { actions: { setProp }, props } = useNode((node) => ({
-    props: node.data.props as SpacerProps,
-  }));
-
-  const heightPresets = ['20px', '40px', '60px', '80px', '120px'];
-
-  return (
-    <div style={{ padding: '12px', display: 'flex', flexDirection: 'column', gap: '14px' }}>
-      <div>
-        <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 }}>Height</label>
-        <div style={{ display: 'flex', gap: 4, flexWrap: 'wrap' }}>
-          {heightPresets.map((h) => (
-            <button
-              key={h}
-              onClick={() => setProp((p: SpacerProps) => { p.height = h; })}
-              style={{
-                padding: '4px 10px', fontSize: 11, borderRadius: 4, cursor: 'pointer',
-                border: '1px solid #3f3f46',
-                background: props.height === h ? '#3b82f6' : '#27272a',
-                color: '#e4e4e7',
-              }}
-            >
-              {h}
-            </button>
-          ))}
-        </div>
-      </div>
-
-      <div>
-        <label style={{ fontSize: 11, color: '#a1a1aa', display: 'block', marginBottom: 6 }}>Custom Height</label>
-        <input
-          type="text"
-          value={props.height || ''}
-          onChange={(e) => setProp((p: SpacerProps) => { p.height = e.target.value; })}
-          placeholder="e.g. 50px, 5rem"
-          style={{ width: '100%', padding: '4px 8px', background: '#27272a', color: '#e4e4e7', border: '1px solid #3f3f46', borderRadius: 4, fontSize: 11 }}
-        />
-      </div>
-    </div>
-  );
-};
-
 /* ---------- Craft config ---------- */
 
 Spacer.craft = {
@@ -91,9 +46,6 @@ Spacer.craft = {
     canMoveIn: () => false,
     canMoveOut: () => true,
   },
-  related: {
-    settings: SpacerSettings,
-  },
 };
 
 /* ---------- HTML export ---------- */