Add custom main-menu overlay & input routing

Integrates a PrismaUI full-screen main-menu overlay with input capture and a bridge to the server browser. Adds F4TMainMenuBridge and F4TMainMenuVanillaSettings stubs, exposes Show/Hide/IsMainMenuVisible/IsCustomMenuInputCaptured in F4TPrismaUI, and routes gamepad input via SetMainMenuActive in F4TMenuInput. MainMenuInject implements robust readiness checks with Bink/frame gating and disables legacy multiplayer-row injection (constexpr false). Fixes cursor clipping by clearing RE::MenuCursor constraints each frame and removes unsupported viewport meta from HTML. Adds window.CO_App/handleControllerInput stubs and updates docs/changelog.

ui/views/CommonwealthOnline/main-menu/script.js

@@ -17,6 +17,35 @@
     }
   };
 
+  // ── Pointer mode API for C++ invocation ─────────────────────────
+  window.CO_App = {
+    setPointerMode: function (mode) {
+      console.log("[CO Main Menu] Pointer mode:", mode);
+    }
+  };
+
+  // ── Controller input handler ─────────────────────────────────────
+  window.handleControllerInput = function (button, phase) {
+    if (phase === "down") {
+      switch (button) {
+        case "dpad_up":
+          moveSelection(-1);
+          break;
+        case "dpad_down":
+          moveSelection(1);
+          break;
+        case "a":
+          activateSelected();
+          break;
+        case "b":
+          if (viewMode === "settings") {
+            exitSettingsMode();
+          }
+          break;
+      }
+    }
+  };
+
   // ── Compute UI scale ───────────────────────────────────────────
   function updateScale() {
     var MIN_SCALE = 0.5;