ui: upgrade to FontAwesome 6, harden burger-menu shim

- Drop FA4 font files and font-awesome.min.css.
- Ship FA6 webfonts (solid, regular, brands) and fa6.min.css.
- io-indicator: use FA6 names (fa-circle-plus / -minus / -exclamation).
- static/js/ui.js: no-op the legacy side-menu click handler when menu
  links are not present (V09 chrome removes them) so the Settings tab
  no longer logs 'cannot set properties of null'.

src/js/io-indicator.js

@@ -49,14 +49,17 @@ module.exports = {
     methods: {
         get_io_state_class: function(active, state) {
             if (typeof active == "undefined" || typeof state == "undefined") {
-                return "fa-exclamation-triangle warn";
+                return "fa-triangle-exclamation warn";
             }
 
+            // Tristated: render as the regular (outline) circle to
+            // distinguish from active/inactive solid circles. Adding
+            // `far` switches to the FA6 regular family.
             if (state == 2) {
-                return "fa-circle-o";
+                return "far fa-circle";
             }
 
-            const icon = state ? "fa-plus-circle" : "fa-minus-circle";
+            const icon = state ? "fa-circle-plus" : "fa-circle-minus";
             return `${icon} ${active ? "active" : "inactive"}`;
         },
 

src/static/css/Audiowide.css

@@ -2,5 +2,5 @@
   font-family: 'Audiowide';
   font-style: normal;
   font-weight: 400;
-  src: local('Audiowide'), local('Audiowide-Regular'), url(http://fonts.gstatic.com/s/audiowide/v4/8XtYtNKEyyZh481XVWfVOqCWcynf_cDxXwCLxiixG1c.ttf) format('truetype');
+  src: local('Audiowide'), local('Audiowide-Regular'), url(https://fonts.gstatic.com/s/audiowide/v4/8XtYtNKEyyZh481XVWfVOqCWcynf_cDxXwCLxiixG1c.ttf) format('truetype');
 }

src/static/js/ui.js

@@ -1,35 +1,37 @@
+// V09 redesign: the legacy side menu was removed. Keep this file
+// shipped in case anything still references it, but no-op the click
+// handler that used to wire up the burger menu so it does not throw
+// "Cannot set properties of null" on the Settings tab.
 (function (window, document) {
+    var menuLink = document.getElementById("menuLink");
+    if (!menuLink) {
+        return;
+    }
 
-    var layout   = document.getElementById('layout'),
-        menu     = document.getElementById('menu'),
-        menuLink = document.getElementById('menuLink');
+    var layout = document.getElementById("layout");
+    var menu   = document.getElementById("menu");
 
     function toggleClass(element, className) {
-        var classes = element.className.split(/\s+/),
-            length = classes.length,
-            i = 0;
-
-        for(; i < length; i++) {
+        if (!element) return;
+        var classes = element.className.split(/\s+/);
+        var i;
+        for (i = 0; i < classes.length; i++) {
             if (classes[i] === className) {
                 classes.splice(i, 1);
                 break;
             }
         }
-        // The className is not found
-        if (length === classes.length) {
+        if (i === classes.length) {
             classes.push(className);
         }
-
-        element.className = classes.join(' ');
+        element.className = classes.join(" ");
     }
 
     menuLink.onclick = function (e) {
-        var active = 'active';
-
+        var active = "active";
         e.preventDefault();
         toggleClass(layout, active);
         toggleClass(menu, active);
         toggleClass(menuLink, active);
     };
-
 }(this, this.document));