feat(builder): text+button package -- typography depth, button target/hover, box-model+anim/vis rollout

- TextStylePanel (Heading/TextBlock): line-height/letter-spacing presets,
  text-transform (none/uppercase/lowercase/capitalize), italic + underline
  toggles (fontStyle/textDecoration), and a custom NumericUnitInput
  font-size alongside the existing preset row. All write to component
  `style`; no toHtml changes needed (style already flows through
  cssPropsToString for both components).
- ButtonStylePanel/ButtonLink: "Open in new tab" checkbox writes the
  existing `target` prop ('_self'/'_blank' -- toHtml already emitted
  rel="noopener noreferrer" for _blank). New Hover State section
  (hoverBg/hoverColor via ColorPickerField) renders a scoped
  `<style>.btn_<hash>:hover{...}</style>` block before the `<a>` in
  toHtml, scoped per-node via scopeId (same pattern as Navbar/Menu) so
  two buttons on one page don't collide; both values sanitized through
  cssValue against <style>-element breakout. Editor canvas gets a live
  hover preview via onMouseEnter/onMouseLeave local state (mirrors Menu's
  approach), since there's no way to preview a CSS :hover rule directly
  on an inline-styled React element.
- Heading/TextBlock/ButtonLink: added margin(per-side)/padding(per-side,
  Text only)/border/box-shadow/opacity style defaults + AnimationControl/
  VisibilityControl-backed animation/animationDelay/hideOnDesktop/
  hideOnTablet/hideOnMobile props, each panel gaining collapsible
  Spacing / Border & Effects / Animation & Visibility sections. Button
  keeps its existing padding-shorthand preset row rather than adding a
  redundant per-side padding control; only margin got the new
  per-side SpacingControl.
- Tests: extended all three *.toHtml.test.ts files -- typography style
  emission (line-height/letter-spacing/text-transform/font-style/
  text-decoration/custom font-size), button target+rel, scoped hover
  style emission + two adversarial style-breakout cases (</style><script>
  and rule-injection via `;}selector{`), and craft.props assertions for
  every new prop on all three components. 674 tests green, tsc + vite
  build clean.

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

craft/src/panels/right/styles/ButtonStylePanel.tsx

@@ -4,6 +4,7 @@ import {
   BG_COLORS,
   RADIUS_PRESETS,
   SPACING_PRESETS,
+  SHADOW_PRESETS,
 } from '../../../constants/presets';
 import {
   StylePanelProps,
@@ -11,16 +12,49 @@ import {
   ColorSwatchGrid,
   PresetButtonGrid,
   TextInputField,
+  ColorPickerField,
+  CollapsibleSection,
+  SpacingControl,
+  SpacingSide,
+  BorderControl,
+  BorderValue,
+  buildBorderShorthand,
+  AnimationControl,
+  VisibilityControl,
+  sectionGap,
+  labelStyle,
   autoTextColor,
   useNodeProp,
 } from './shared';
 
+function capitalize(s: string): string {
+  return s.charAt(0).toUpperCase() + s.slice(1);
+}
+
+/** Parses a `border` shorthand string (e.g. "2px solid #ff0000") back into
+ *  the {width,style,color} shape BorderControl edits. Only needs to
+ *  round-trip values this same panel produced via buildBorderShorthand. */
+function parseBorderShorthand(v: string | undefined): BorderValue {
+  if (!v || v === 'none') return { width: '', style: 'none', color: '#000000' };
+  const m = String(v).trim().match(/^(\d+(?:\.\d+)?(?:px|em|rem)?)\s+(\w+)\s+(.+)$/);
+  if (!m) return { width: '', style: 'none', color: '#000000' };
+  return { width: m[1], style: m[2], color: m[3] };
+}
+
+/** style.opacity is a CSS-length-free numeric string ("0.8") or blank
+ *  (treated as fully opaque). Converts to a 0-100 integer for the UI. */
+function opacityPercent(v: unknown): number {
+  if (v === undefined || v === null || v === '') return 100;
+  const n = parseFloat(String(v));
+  return Number.isFinite(n) ? Math.round(n * 100) : 100;
+}
+
 /* ---------- BUTTON ---------- */
 export const ButtonStylePanel: React.FC<StylePanelProps> = ({ selectedId, nodeProps }) => {
   const { actions } = useEditor();
   const style: CSSProperties = nodeProps.style || {};
 
-  const { setPropStyle } = useNodeProp(selectedId);
+  const { setProp, setPropStyle } = useNodeProp(selectedId);
 
   const setButtonColor = useCallback(
     (bgColor: string) => {
@@ -61,6 +95,16 @@ export const ButtonStylePanel: React.FC<StylePanelProps> = ({ selectedId, nodePr
           actions.setProp(selectedId, (props: any) => { props.href = v; });
         }}
       />
+      <div className="guided-section">
+        <label style={{ display: 'flex', alignItems: 'center', gap: 6, fontSize: 11, color: '#e4e4e7', cursor: 'pointer' }}>
+          <input
+            type="checkbox"
+            checked={nodeProps.target === '_blank'}
+            onChange={(e) => setProp('target', e.target.checked ? '_blank' : '_self')}
+          />
+          Open in new tab
+        </label>
+      </div>
       <div className="guided-section">
         <SectionLabel>Border Radius</SectionLabel>
         <PresetButtonGrid
@@ -77,6 +121,70 @@ export const ButtonStylePanel: React.FC<StylePanelProps> = ({ selectedId, nodePr
           onSelect={(v) => setPropStyle('padding', v)}
         />
       </div>
+
+      {/* Hover state -- rendered into a scoped <style>...:hover{} block by
+          ButtonLink.toHtml (published export only; not shown live in the
+          editor canvas beyond the hover preview ButtonLink itself does). */}
+      <CollapsibleSection title="Hover State" defaultOpen={false}>
+        <ColorPickerField
+          label="Hover Background"
+          value={nodeProps.hoverBg || ''}
+          onChange={(v) => setProp('hoverBg', v)}
+        />
+        <ColorPickerField
+          label="Hover Text Color"
+          value={nodeProps.hoverColor || ''}
+          onChange={(v) => setProp('hoverColor', v)}
+        />
+      </CollapsibleSection>
+
+      {/* Box model + border/effects + animation/visibility rollout */}
+      <CollapsibleSection title="Spacing" defaultOpen={false}>
+        <SpacingControl
+          label="Margin"
+          value={{ top: style.marginTop as string, right: style.marginRight as string, bottom: style.marginBottom as string, left: style.marginLeft as string }}
+          onChange={(side: SpacingSide, v: string) => setPropStyle(`margin${capitalize(side)}`, v)}
+        />
+      </CollapsibleSection>
+      <CollapsibleSection title="Border & Effects" defaultOpen={false}>
+        <BorderControl
+          value={parseBorderShorthand(style.border as string)}
+          onChange={(v) => setPropStyle('border', buildBorderShorthand(v))}
+        />
+        <div className="guided-section">
+          <SectionLabel>Shadow</SectionLabel>
+          <PresetButtonGrid presets={SHADOW_PRESETS} activeValue={style.boxShadow as string} onSelect={(v) => setPropStyle('boxShadow', v)} />
+        </div>
+        <div style={sectionGap}>
+          <label style={labelStyle}>Opacity: {opacityPercent(style.opacity)}%</label>
+          <input
+            type="range"
+            min={0}
+            max={100}
+            value={opacityPercent(style.opacity)}
+            onChange={(e) => setPropStyle('opacity', String(Number(e.target.value) / 100))}
+            style={{ width: '100%' }}
+          />
+        </div>
+      </CollapsibleSection>
+      <CollapsibleSection title="Animation & Visibility" defaultOpen={false}>
+        <AnimationControl
+          value={{ animation: nodeProps.animation || 'none', animationDelay: nodeProps.animationDelay }}
+          onChange={(v) => { setProp('animation', v.animation); setProp('animationDelay', v.animationDelay); }}
+        />
+        <VisibilityControl
+          value={{
+            hideOnDesktop: nodeProps.hideOnDesktop,
+            hideOnTablet: nodeProps.hideOnTablet,
+            hideOnMobile: nodeProps.hideOnMobile,
+          }}
+          onChange={(v) => {
+            setProp('hideOnDesktop', !!v.hideOnDesktop);
+            setProp('hideOnTablet', !!v.hideOnTablet);
+            setProp('hideOnMobile', !!v.hideOnMobile);
+          }}
+        />
+      </CollapsibleSection>
     </>
   );
 };