v0.3.0 - Polish: accessibility, security, performance, RTL, French translation

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

src/scss/_custom.scss

@@ -75,3 +75,46 @@
         background: var(--bs-body-bg);
     }
 }
+
+// Skip link (accessibility)
+.wp-bootstrap-skip-link {
+    position: absolute;
+    top: -100%;
+    left: 0;
+    z-index: $zindex-fixed + 10;
+    padding: 0.5rem 1rem;
+    background: var(--bs-primary);
+    color: #fff;
+    text-decoration: none;
+    font-weight: 600;
+
+    &:focus {
+        top: 0;
+    }
+}
+
+// Post featured image
+.post-thumbnail {
+    aspect-ratio: 16 / 9;
+    object-fit: cover;
+    width: 100%;
+}
+
+// Card thumbnail
+.card-thumbnail {
+    aspect-ratio: 3 / 2;
+    object-fit: cover;
+}
+
+// Sidebar heading
+.sidebar-heading {
+    letter-spacing: 1.6px;
+}
+
+// Hero overlay
+.hero-overlay {
+    background-position: center;
+    background-size: cover;
+    background-repeat: no-repeat;
+    opacity: 0.3;
+}