Replace emoji lock icons with Unicode symbols

ttstoy/webui/templates/dashboard.html

@@ -112,7 +112,7 @@
   </div>
   <div style="display:flex;gap:0.75rem;align-items:center;flex-wrap:wrap;">
     <button class="btn btn-primary" id="vc-btn" onclick="submitTTS()" disabled style="opacity:0.5;">
-      <span id="spinner" class="spin" style="display:none;"></span><span id="vc-lock">&#x1F512;</span> Speak in VC
+      <span id="spinner" class="spin" style="display:none;"></span><span id="vc-lock" style="font-size:0.75rem;">&#9906;</span> Speak in VC
     </button>
     <button class="btn btn-secondary" id="gen-only-btn" onclick="generateOnly()" style="display:none;">
       <span id="gen-spinner" class="spin" style="display:none;"></span> Generate Only
@@ -368,11 +368,11 @@ document.getElementById('vc-lock').addEventListener('click', function(e) {
   if (btn.disabled) {
     btn.disabled = false;
     btn.style.opacity = '1';
-    lock.textContent = '\u{1F513}';
+    lock.innerHTML = '&#9907;';
   } else {
     btn.disabled = true;
     btn.style.opacity = '0.5';
-    lock.textContent = '\u{1F512}';
+    lock.innerHTML = '&#9906;';
   }
 });
 document.getElementById('vc-lock').style.cursor = 'pointer';