Add Unicode icon fallback for a11y, fix duplicate label color

- Add wheelchair symbol fallback when FA7 glyph fails to render
- Fix duplicate #mokoThemeFab .label rule missing color: #fff

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/media/css/template.css

@@ -17389,6 +17389,7 @@ button#mokoThemeSwitch {
 #mokoThemeFab .label {
   user-select: none;
   font-size: .875rem;
+  color: #fff;
 }
 
 #mokoThemeFab.debug-outline {

src/media/js/template.js

@@ -292,7 +292,17 @@
 		toggle.className = "a11y-toggle";
 		toggle.setAttribute("aria-label", "Accessibility options");
 		toggle.setAttribute("aria-expanded", "false");
-		toggle.appendChild(faIcon("fa-solid fa-universal-access"));
+		var a11yIcon = faIcon("fa-solid fa-universal-access");
+		// Unicode fallback if FA7 glyph doesn't render (e.g. FA6/FA7 conflict)
+		setTimeout(function () {
+			var cs = win.getComputedStyle(a11yIcon, "::before");
+			if (!cs.content || cs.content === "none" || cs.content === '""' || cs.content === '"" / ""') {
+				a11yIcon.className = "";
+				a11yIcon.textContent = "\u267F";
+				a11yIcon.style.fontSize = "1.1rem";
+			}
+		}, 500);
+		toggle.appendChild(a11yIcon);
 
 		// Panel
 		var panel = doc.createElement("div");