Add hover sync and CO hover component

Add a hover system to restore :hover-like behavior for custom UI elements in the CommonwealthOnline view. Changes include:

- plugin/src/F4TPrismaUI.cpp: add SyncBrowserHover() which reads the native cursor position, converts it to client coordinates, and invokes a JS update on the server browser view; register a periodic task to call SyncBrowserHover every other tick.
- ui/views/CommonwealthOnline/browser/components/hover.js: new component that tracks pointer position, determines hovered targets using a selector list, and applies/removes a .hovered class; exposes bind(), updateFromPoint(), and clear().
- ui/views/CommonwealthOnline/browser/app.js & index.html: include and bind the new hover component during UI initialization.
- ui/views/CommonwealthOnline/browser/styles.css: add .hovered variants and transitions for nav items, buttons, rows, and filter controls to match hover visuals.
- steam_interfaces.txt: add a list of Steam interface version strings (new file).

Purpose: ensure custom buttons/rows that don't receive native :hover updates from the renderer get visible hover feedback by syncing the native cursor into the web UI and toggling a .hovered class.

ui/views/CommonwealthOnline/browser/app.js

@@ -296,6 +296,10 @@
   }
 
   function bindUi() {
+    if (window.CO_Hover) {
+      CO_Hover.bind(root);
+    }
+
     CO_Tabs.bind(root, function (tabName) {
       switchTab(tabName);
     });

ui/views/CommonwealthOnline/browser/components/hover.js

@@ -0,0 +1,118 @@
+(function () {
+  "use strict";
+
+  /*
+   * PrismaUI / Ultralight updates :hover only for native form controls (input, select).
+   * Custom buttons and rows need a .hovered class driven by cursor position.
+   */
+  var HOVER_SELECTOR = [
+    ".co-nav-item",
+    ".co-server-row",
+    ".co-btn",
+    ".co-checkbox-row"
+  ].join(", ");
+
+  var currentHovered = null;
+  var lastX = null;
+  var lastY = null;
+  var rafId = null;
+  var boundPanel = null;
+
+  function findHoverTarget(node) {
+    if (!node || !node.closest) {
+      return null;
+    }
+
+    var target = node.closest(HOVER_SELECTOR);
+    if (!target || !boundPanel || !boundPanel.contains(target)) {
+      return null;
+    }
+
+    return target;
+  }
+
+  function setHovered(target) {
+    if (target === currentHovered) {
+      return;
+    }
+
+    if (currentHovered) {
+      currentHovered.classList.remove("hovered");
+    }
+
+    currentHovered = target;
+
+    if (currentHovered) {
+      currentHovered.classList.add("hovered");
+    }
+  }
+
+  function clearHovered() {
+    setHovered(null);
+    lastX = null;
+    lastY = null;
+  }
+
+  function isInsidePanel(x, y) {
+    if (!boundPanel) {
+      return false;
+    }
+
+    var rect = boundPanel.getBoundingClientRect();
+    return x >= rect.left && x <= rect.right && y >= rect.top && y <= rect.bottom;
+  }
+
+  function updateFromPoint(x, y) {
+    if (typeof x !== "number" || typeof y !== "number" || isNaN(x) || isNaN(y)) {
+      return;
+    }
+
+    lastX = x;
+    lastY = y;
+
+    if (currentHovered && !document.body.contains(currentHovered)) {
+      currentHovered = null;
+    }
+
+    if (!isInsidePanel(x, y)) {
+      setHovered(null);
+      return;
+    }
+
+    var node = document.elementFromPoint(x, y);
+    setHovered(findHoverTarget(node));
+  }
+
+  function onPointerEvent(e) {
+    updateFromPoint(e.clientX, e.clientY);
+  }
+
+  function tick() {
+    if (lastX !== null && lastY !== null) {
+      updateFromPoint(lastX, lastY);
+    }
+    rafId = window.requestAnimationFrame(tick);
+  }
+
+  window.CO_Hover = {
+    bind: function (root) {
+      boundPanel = root && root.querySelector(".co-panel");
+      if (!boundPanel) {
+        return;
+      }
+
+      document.addEventListener("mousemove", onPointerEvent, true);
+      document.addEventListener("pointermove", onPointerEvent, true);
+
+      boundPanel.addEventListener("mouseleave", clearHovered);
+
+      if (!rafId) {
+        rafId = window.requestAnimationFrame(tick);
+      }
+    },
+
+    updateFromPoint: updateFromPoint,
+
+    clear: clearHovered
+  };
+})();

ui/views/CommonwealthOnline/browser/index.html

@@ -87,6 +87,7 @@
   <script src="./components/server-details.js"></script>
   <script src="./components/controller-prompts.js"></script>
   <script src="./components/direct-connect.js"></script>
+  <script src="./components/hover.js"></script>
   <script src="./app.js"></script>
 </body>
 </html>

ui/views/CommonwealthOnline/browser/styles.css

@@ -172,10 +172,15 @@ body {
   transition: background var(--co-transition), color var(--co-transition);
 }
 
-.co-nav-item:hover:not(.active) {
+.co-nav-item:hover:not(.active),
+.co-nav-item.hovered:not(.active) {
   background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.08);
 }
 
+.co-nav-item.active.hovered {
+  filter: brightness(1.08);
+}
+
 .co-nav-item.active {
   background: var(--co-selected);
   color: var(--co-selected-text);
@@ -369,12 +374,20 @@ body {
   padding: 5px 8px;
   border-radius: 0;
   cursor: var(--co-cursor);
+  transition: border-color var(--co-transition);
 }
 
 .co-filter-input::placeholder {
   color: var(--co-text-dim);
 }
 
+.co-filter-input:hover,
+.co-filter-input.hovered,
+.co-filter-select:hover,
+.co-filter-select.hovered {
+  border-color: rgba(var(--co-r), var(--co-g), var(--co-b), 0.45);
+}
+
 .co-filter-input:focus,
 .co-filter-select:focus {
   border-color: var(--co-border);
@@ -390,6 +403,12 @@ body {
   letter-spacing: 0.06em;
   text-transform: uppercase;
   cursor: var(--co-cursor);
+  transition: background var(--co-transition), border-color var(--co-transition);
+}
+
+.co-checkbox-row:hover,
+.co-checkbox-row.hovered {
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.06);
 }
 
 .co-checkbox {
@@ -425,11 +444,13 @@ body {
   cursor: var(--co-cursor);
   margin-left: auto;
   flex-shrink: 0;
-  transition: background var(--co-transition);
+  transition: background var(--co-transition), border-color var(--co-transition);
 }
 
-.co-btn:hover {
+.co-btn:hover,
+.co-btn.hovered {
   background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.1);
+  border-color: rgba(var(--co-r), var(--co-g), var(--co-b), 0.45);
 }
 
 .co-btn.focused {
@@ -475,10 +496,11 @@ body {
   font-size: var(--co-font-md);
   line-height: 1.2;
   cursor: var(--co-cursor);
-  transition: background var(--co-transition);
+  transition: background var(--co-transition), color var(--co-transition);
 }
 
-.co-server-row:hover:not(.selected) {
+.co-server-row:hover:not(.selected),
+.co-server-row.hovered:not(.selected) {
   background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.06);
 }