Add contact antispam and fix gallery video playback.

English-only messages, rate limiting, min fill time, and normalized email
validation; improve modal video serving with posters, correct MIME types, and
no gzip on gallery media.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/templates/layout.templ

@@ -70,8 +70,25 @@ templ Layout(title string, preloadImage string, content templ.Component) {
 						hydrateLazyThumbs(document);
 					});
 
+					function initModalVideos(root) {
+						root.querySelectorAll(".modal-video video").forEach(function (video) {
+							var wrap = video.closest(".modal-video");
+							var notice = wrap && wrap.querySelector(".video-unavailable");
+							video.addEventListener(
+								"error",
+								function () {
+									video.classList.add("video-broken");
+									if (notice) notice.hidden = false;
+								},
+								{ once: true },
+							);
+							video.load();
+						});
+					}
+
 					document.body.addEventListener("htmx:afterSwap", function (event) {
 						hydrateLazyThumbs(event.target);
+						initModalVideos(event.target);
 					});
 				})();
 			</script>