D3 Part 2: index + kapcsolat on design system v2

- Both pages: Google Fonts links + preconnects removed; ONE stylesheet
  (/assets/site.css?v=1); embedded <style> blocks deleted; body classes
  page-index/page-kapcsolat; canonical nav/footer (active marker per
  page; index's #szolgaltatasok href normalized to /#szolgaltatasok);
  all emoji -> sprite icons (feature tiles = .ico-tile 48px bg-2
  squares; headings .ico-lg; inline .ico) or plain text.
- kapcsolat: the contact form is functionally frozen — every field
  name/id, the submit JS, and the /api/contact endpoint byte-identical;
  only the visual layer changed (upload/paperclip + file-type icons as
  sprite refs in JS strings, the x button as &#215;, status-message
  emoji prefixes dropped).
- site.css: CSS-generated marks (content '✓'/'✗'/'⚠'/'★ …') replaced by
  currentColor mask-based marks / plain text (emoji-free stylesheet;
  gate now scans it too); .ico-tile is svg-as-tile (immune to container
  display rules), .ico-lg added.
- Gates: zero failures for the two converted pages; the remaining five
  convert in Part 3.

scripts/site_gates.py

@@ -63,9 +63,13 @@ for p in PAGES:
         fail("%s: missing UTF-8 BOM (first bytes: %s)" % (p, raw[:3].hex()))
     pages[p] = raw.decode("utf-8-sig")
 
-# gate 2: emoji
+# gate 2: emoji (pages + the shared stylesheet)
 total_emoji = 0
-for p, s in pages.items():
+emoji_targets = dict(pages)
+_css = os.path.join(W, "assets", "site.css")
+if os.path.exists(_css):
+    emoji_targets["assets/site.css"] = io.open(_css, encoding="utf-8").read()
+for p, s in emoji_targets.items():
     hits = [(i, ch) for i, ch in enumerate(s) if is_emoji(ch)]
     if hits:
         total_emoji += len(hits)