Fix orange dot/hero image visibility, arrow alignment, and add a mobile legal-page TOC

- PopIn (Home Hero's brand dot) switched from whileInView to animate — its
  translate-based entrance could push the element off-screen on a narrow
  phone before the IntersectionObserver ever saw it as visible, leaving it
  stuck invisible permanently.
- Hero image: no longer wrapped in Reveal below lg: — whileInView's margin
  meant it stayed at opacity:0 (a white gap above the fold) on short mobile
  viewports until scrolled. Reveal's fade-in kept from lg: up.
- "→ Label" CTA links (Tools.tsx, Blog.tsx) now use a flex row with the
  arrow as its own span instead of a literal inline "→" character, which
  doesn't reliably align to the surrounding text's cap-height.
- Replaced icon-arrow-connector.svg with a new shared StepArrow component
  (inline SVG) across all three step sections — the old asset's color
  couldn't be overridden from outside the SVG file, so it could never
  actually become brand-orange. Bigger and better-shaped below the
  structural breakpoint per feedback.
- Added MobileSectionTOC (SectionTOC.tsx) — a <details> accordion shown
  below lg: on Impressum/Datenschutz/AGB/Widerruf/Versand, which previously
  had no on-page navigation aid at all below lg: (the sidebar TOC is
  `hidden` entirely there).
- Updated the figma-to-nextjs skill with 8 new dated Gotchas from this
  mobile-responsive pass, and expanded Step 6's verification checklist.
- README: new "Mobile responsive pass" section summarizing the above.

app/components/Tools.tsx

@@ -71,11 +71,18 @@ export async function Tools() {
                   {tool.description}
                 </p>
               </div>
+              {/* flex items-center + arrow as its own span, not inline text
+                  — the → glyph sits low relative to the surrounding text's
+                  cap-height in the font used here, off-center against the
+                  label if it's just part of the same text node (fixed
+                  2026-07-24, same pattern ProductGrid.tsx's "Mehr
+                  erfahren" link already uses). */}
               <Link
                 href={tool.ctaHref}
-                className="font-bold leading-normal text-body whitespace-nowrap hover:text-brand transition-colors"
+                className="flex items-center gap-1 font-bold leading-normal text-body whitespace-nowrap hover:text-brand transition-colors"
               >
-                → {tool.ctaLabel}
+                <span aria-hidden>→</span>
+                <span>{tool.ctaLabel}</span>
               </Link>
             </div>
           </RevealItem>