Add dynamic UI theme for server browser

Introduce runtime-driven UI theming for the server browser

- Expose PushUITheme() in F4TServerBrowserBridge and implement ColorToJson + PushUIThemeInternal to serialize HUD colors and invoke a JS hook.
- Call PushUITheme on UI initialization and when the browser is shown so the webview receives current HUD colors.
- Add frontend handler for "uiTheme" in app.js and a new components/theme.js that implements window.applyCoTheme to set CSS vars and tint the cursor SVG.
- Update styles.css to use RGB component CSS variables (--co-r/--co-g/--co-b and background equivalents) so colors can be overridden at runtime.
- Update index.html to include the new theme script and tweak cursor SVG stroke width; cursor asset updated as well.

This enables the plugin to synchronize the in-game HUD colors with the browser UI dynamically.

plugin/include/F4TServerBrowserBridge.h

@@ -15,5 +15,6 @@ namespace F4T::ServerBrowser
 		static void HandleAction(const nlohmann::json& a_action);
 		static void ForwardControllerInput(const char* a_button, const char* a_phase);
 		static void PushConnectionStatus();
+		static void PushUITheme();
 	};
 }

plugin/src/F4TPrismaUI.cpp

@@ -178,6 +178,7 @@ namespace F4T::PrismaUI
 				});
 
 			F4T::ServerBrowser::ServerBrowserBridge::Initialize(g_api, a_view);
+			F4T::ServerBrowser::ServerBrowserBridge::PushUITheme();
 
 			g_api->BindUIEvent(a_view, "coAction", [](const char* a_json) {
 				if (!a_json) {

plugin/src/F4TServerBrowserBridge.cpp

@@ -5,6 +5,7 @@
 #include "F4TServerBrowserBridge.h"
 #include "F4TServerBrowserData.h"
 
+#include <algorithm>
 #include <format>
 #include <string_view>
 
@@ -58,6 +59,38 @@ namespace F4T::ServerBrowser
 			});
 		}
 
+		nlohmann::json ColorToJson(const RE::NiColor& a_color)
+		{
+			const auto toByte = [](float a_channel) {
+				return static_cast<int>(std::clamp(a_channel * 255.0f, 0.0f, 255.0f));
+			};
+
+			return nlohmann::json{
+				{ "r", toByte(a_color.r) },
+				{ "g", toByte(a_color.g) },
+				{ "b", toByte(a_color.b) }
+			};
+		}
+
+		void PushUIThemeInternal()
+		{
+			if (!g_api || g_view == 0 || !g_api->IsValid(g_view)) {
+				return;
+			}
+
+			const auto hudColor = RE::HUDMenuUtils::GetGameplayHUDColor();
+			const auto hudBgColor = RE::HUDMenuUtils::GetGameplayHUDBackgroundColor();
+			const auto themePayload = nlohmann::json{
+				{ "hud", ColorToJson(hudColor) },
+				{ "hudBackground", ColorToJson(hudBgColor) }
+			};
+
+			const auto script = std::format(
+				"if(window.applyCoTheme){{window.applyCoTheme({});}}",
+				themePayload.dump());
+			g_api->Invoke(g_view, script.c_str());
+		}
+
 		void PushConnectionStatusEvent()
 		{
 			const auto connected = F4T::Networking::IsConnectedToServer();
@@ -136,6 +169,7 @@ namespace F4T::ServerBrowser
 
 	void ServerBrowserBridge::OnBrowserShown()
 	{
+		PushUIThemeInternal();
 		DispatchEvent(nlohmann::json{ { "type", "menuOpened" } });
 		RefreshServerList();
 	}
@@ -289,4 +323,9 @@ namespace F4T::ServerBrowser
 	{
 		PushConnectionStatusEvent();
 	}
+
+	void ServerBrowserBridge::PushUITheme()
+	{
+		PushUIThemeInternal();
+	}
 }

ui/views/CommonwealthOnline/browser/app.js

@@ -482,6 +482,11 @@
       case "connectionStatusChanged":
         state.connectionStatus = event.status || "Online";
         break;
+      case "uiTheme":
+        if (typeof window.applyCoTheme === "function") {
+          window.applyCoTheme(event);
+        }
+        break;
       case "menuOpened":
         break;
       case "menuClosed":

ui/views/CommonwealthOnline/browser/assets/F4MouseCursor.svg

@@ -6,6 +6,7 @@
       .st0 {
         fill: #fff;
         stroke: #000;
+        stroke-width: 3.2px;
         stroke-miterlimit: 10;
       }
     </style>

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

@@ -0,0 +1,55 @@
+(function () {
+  "use strict";
+
+  function clampByte(value) {
+    return Math.max(0, Math.min(255, Math.round(value)));
+  }
+
+  function applyHudRgb(root, prefix, color) {
+    if (!color) {
+      return;
+    }
+
+    root.style.setProperty(prefix + "-r", String(clampByte(color.r)));
+    root.style.setProperty(prefix + "-g", String(clampByte(color.g)));
+    root.style.setProperty(prefix + "-b", String(clampByte(color.b)));
+  }
+
+  function applyCursorTint(root, color) {
+    if (!color) {
+      return;
+    }
+
+    var r = clampByte(color.r);
+    var g = clampByte(color.g);
+    var b = clampByte(color.b);
+    var svg =
+      '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32.3 31.24">' +
+      '<polygon fill="rgb(' + r + "," + g + "," + b + ')" stroke="#000" stroke-width="3.2" ' +
+      'stroke-miterlimit="10" points="17.4 30.41 31.46 15.9 1.2 1.14 17.4 30.41"/></svg>';
+    var url =
+      'url("data:image/svg+xml,' +
+      encodeURIComponent(svg) +
+      '") 1 1, default';
+    root.style.setProperty("--co-cursor", url);
+  }
+
+  window.applyCoTheme = function (theme) {
+    if (!theme) {
+      return;
+    }
+
+    var root = document.documentElement;
+    var hud = theme.hud || theme;
+    applyHudRgb(root, "--co", hud);
+    applyHudRgb(root, "--co-bg", theme.hudBackground);
+    applyCursorTint(root, hud);
+
+    console.log(
+      "[CO] Applied HUD theme rgb(" +
+        clampByte(hud.r) + "," +
+        clampByte(hud.g) + "," +
+        clampByte(hud.b) + ")"
+    );
+  };
+})();

ui/views/CommonwealthOnline/browser/index.html

@@ -79,6 +79,7 @@
     </div>
   </div>
 
+  <script src="./components/theme.js"></script>
   <script src="./components/mock-data.js"></script>
   <script src="./components/tabs.js"></script>
   <script src="./components/filters.js"></script>

ui/views/CommonwealthOnline/browser/styles.css

@@ -7,17 +7,28 @@
 }
 
 :root {
-  --co-green: #2dff28;
+  /* RGB components — overridden at runtime from Fallout4Prefs.ini via plugin. */
-  --co-green-soft: #2dff28;
+  --co-r: 18;
-  --co-green-dim: rgba(45, 255, 40, 0.22);
+  --co-g: 255;
-  --co-bg: rgba(0, 12, 0, 0.62);
+  --co-b: 21;
-  --co-bg-dark: rgba(0, 10, 0, 0.72);
+  --co-bg-r: 0;
+  --co-bg-g: 10;
+  --co-bg-b: 0;
+  --co-green: rgb(var(--co-r), var(--co-g), var(--co-b));
+  --co-green-soft: rgb(var(--co-r), var(--co-g), var(--co-b));
+  --co-green-dim: rgba(var(--co-r), var(--co-g), var(--co-b), 0.22);
+  --co-bg: rgba(var(--co-bg-r), var(--co-bg-g), var(--co-bg-b), 0.62);
+  --co-bg-dark: rgba(var(--co-bg-r), var(--co-bg-g), var(--co-bg-b), 0.72);
   --co-bg-list: transparent;
-  --co-selected: #2dff28;
+  --co-selected: rgb(var(--co-r), var(--co-g), var(--co-b));
-  --co-selected-text: #001400;
+  --co-selected-text: rgb(
-  --co-border: #2dff28;
+    calc(var(--co-r) * 0.05),
-  --co-text-dim: rgba(45, 255, 40, 0.5);
+    calc(var(--co-g) * 0.05),
-  --co-ping-good: #2dff28;
+    calc(var(--co-b) * 0.05)
+  );
+  --co-border: rgb(var(--co-r), var(--co-g), var(--co-b));
+  --co-text-dim: rgba(var(--co-r), var(--co-g), var(--co-b), 0.5);
+  --co-ping-good: rgb(var(--co-r), var(--co-g), var(--co-b));
   --co-ping-mid: #c8ff28;
   --co-ping-bad: #ffd428;
   --co-danger: #ff6a6a;
@@ -162,7 +173,7 @@ body {
 }
 
 .co-nav-item:hover:not(.active) {
-  background: rgba(45, 255, 40, 0.08);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.08);
 }
 
 .co-nav-item.active {
@@ -171,11 +182,11 @@ body {
 }
 
 .co-nav-item.focused:not(.active) {
-  background: rgba(45, 255, 40, 0.12);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.12);
 }
 
 .co-nav-list.focused .co-nav-item.focused:not(.active) {
-  background: rgba(45, 255, 40, 0.12);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.12);
 }
 
 /* Right content */
@@ -418,11 +429,11 @@ body {
 }
 
 .co-btn:hover {
-  background: rgba(45, 255, 40, 0.1);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.1);
 }
 
 .co-btn.focused {
-  background: rgba(45, 255, 40, 0.18);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.18);
   outline: 1px solid var(--co-green);
 }
 
@@ -436,7 +447,7 @@ body {
 }
 
 .co-server-list-wrap.focused {
-  background: rgba(45, 255, 40, 0.03);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.03);
 }
 
 .co-server-list {
@@ -468,7 +479,7 @@ body {
 }
 
 .co-server-row:hover:not(.selected) {
-  background: rgba(45, 255, 40, 0.06);
+  background: rgba(var(--co-r), var(--co-g), var(--co-b), 0.06);
 }
 
 .co-server-row.selected {