Initial commit — Dossier Rhino 8 Plugin

OpenStudio-Suite Architektur-Plugin fuer Rhino 8 (Mac):
- Smart-Elemente: Wand, Decke, Dach (Pult/Sattel/Walm/Mansarde),
  Oeffnungen (Fenster/Tueren mit Rahmen + Sims + Glas + Fluegel),
  Treppen (gerade · L · Wendel mit Schrittmass-Validierung)
- Live-Previews mit Step-Lines + Soll-Range-Clamping
- Bidirektionale Selection-Sync zwischen Source-Linie und Volume
- Geschoss-/Ebenen-Verwaltung mit OKFF-Persistenz
- Layouts mit PDF-Export
- Ausschnitte / Massstab / Override-Regeln
- Petrol-Gruen Theme (Rapport-konform)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/components/Section.jsx

@@ -0,0 +1,41 @@
+import { useState } from 'react'
+import Icon from './Icon'
+
+export default function Section({ title, badge, action, defaultOpen = true, children }) {
+  const [open, setOpen] = useState(defaultOpen)
+
+  return (
+    <div>
+      <div
+        onClick={() => setOpen(o => !o)}
+        style={{
+          display: 'flex',
+          alignItems: 'center',
+          gap: 6,
+          padding: '6px 14px 4px',
+          cursor: 'pointer',
+          userSelect: 'none',
+        }}
+      >
+        <span style={{
+          transform: open ? 'rotate(0deg)' : 'rotate(-90deg)',
+          transition: 'transform 0.2s cubic-bezier(0.4, 0, 0.2, 1)',
+          color: 'var(--text-muted)',
+          display: 'inline-flex',
+          marginLeft: -6,
+        }}>
+          <Icon name="arrow_drop_down" size={18} />
+        </span>
+        <span style={{
+          fontSize: 11, fontWeight: 500,
+          color: 'var(--text-primary)',
+          letterSpacing: '0.02em',
+        }}>{title}</span>
+        {badge != null && <span className="chip" style={{ fontSize: 8 }}>{badge}</span>}
+        <div style={{ flex: 1, height: 1, background: 'var(--border)', marginLeft: 4 }} />
+        {action && <div onClick={e => e.stopPropagation()}>{action}</div>}
+      </div>
+      {open && children}
+    </div>
+  )
+}