Add 'Forening vs. firma' section with structural comparison

Neutral, factual explanation of why a forening provides structural
guarantees an ApS cannot:
- Cannot be sold/acquired
- No profit motive — overskud stays in the org
- Transparent accounts
- Members, not customers — you own the collective
- Concluding note: ingen kan købe PunktFri og tjene penge på dine domæner

CSS: compare-grid with two-column layout, preferred column highlighted
in primary blue with checkmarks, non-preferred column with muted dashes.

static/style.css

@@ -923,3 +923,83 @@ footer {
     line-height: 1.7;
     padding-top: 1rem;
 }
+
+/* ── Compare grid (forening vs. firma) ─────────────────────── */
+.compare-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 1.5rem;
+    margin: 1.5rem 0;
+}
+
+@media (max-width: 640px) {
+    .compare-grid { grid-template-columns: 1fr; }
+}
+
+.compare-col {
+    border: 1px solid var(--border);
+    border-radius: 6px;
+    padding: 1.25rem 1.5rem;
+}
+
+.compare-col h3 {
+    font-size: 0.85rem;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: var(--muted);
+    margin: 0 0 1rem 0;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    flex-wrap: wrap;
+}
+
+.compare-col.is-preferred {
+    border-color: var(--primary);
+    background: var(--primary-bg);
+}
+
+.compare-col.is-preferred h3 {
+    color: var(--primary);
+}
+
+.preferred-badge {
+    font-size: 0.7rem;
+    font-weight: 600;
+    background: var(--primary);
+    color: #fff;
+    padding: 0.15rem 0.5rem;
+    border-radius: 3px;
+    text-transform: uppercase;
+    letter-spacing: 0.04em;
+}
+
+.compare-col ul {
+    list-style: none;
+    padding: 0;
+    margin: 0;
+}
+
+.compare-col ul li {
+    padding: 0.5rem 0;
+    font-size: 0.88rem;
+    line-height: 1.55;
+    border-bottom: 1px solid var(--border);
+    color: var(--text);
+}
+
+.compare-col ul li:last-child { border-bottom: none; }
+
+.compare-col:not(.is-preferred) ul li::before {
+    content: '–';
+    color: var(--muted);
+    margin-right: 0.5rem;
+}
+
+.compare-col.is-preferred ul li::before {
+    content: '✓';
+    color: var(--primary);
+    margin-right: 0.5rem;
+    font-weight: 700;
+}