feat(builder): surface hidden section/pricing/social props + box-model rollout

SectionTypePanel (Accordion/Tabs/Testimonials/Countdown/NumberCounter/
CTASection/CallToAction/FeaturesGrid), PricingStylePanel, and
SocialStylePanel all gain a Spacing & Border section (margin/padding
per-side, border, box-shadow, opacity), an Animation section, and a
Visibility section, wired to the shared SpacingControl/BorderControl/
AnimationControl/VisibilityControl.

PricingTable's per-card colors (cardBg/textColor/subColor/featColor/
checkColor/btnBg/btnColor) were previously hard-coded literals computed
from featuredBg inside toHtml -- promoted to real optional props (each
falling back to the exact prior literal when unset) and exposed via
ColorPickerField in PricingStylePanel.

SocialStylePanel now exposes SocialLinks' iconShape/gap (already-built
props with no control), plus Icon's bgColor/bgShape/bgSize/link and
StarRating's filledColor/emptyColor, which the panel's generic
iconBgColor/starColor checks never matched since those aren't Icon's or
StarRating's real prop names.

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

craft/src/components/sections/Countdown.toHtml.test.ts

@@ -62,3 +62,14 @@ describe('Countdown.toHtml script nit: ticking interval stops at zero', () => {
     expect(html).toMatch(/if\s*\(\s*target\s*-\s*Date\.now\(\)\s*>\s*0\s*\)\s*\{/);
   });
 });
+
+describe('Countdown.craft.props includes the box-model/animation/visibility rollout props', () => {
+  test('animation, animationDelay, and all 3 hideOn* flags are declared (blank/false defaults)', () => {
+    const props = (Countdown as any).craft.props;
+    expect(props).toHaveProperty('animation', '');
+    expect(props).toHaveProperty('animationDelay', '');
+    expect(props).toHaveProperty('hideOnDesktop', false);
+    expect(props).toHaveProperty('hideOnTablet', false);
+    expect(props).toHaveProperty('hideOnMobile', false);
+  });
+});