Add OverviewMenu escape menu, remove Tab mode cycling

- New OverviewMenu component: Esc toggles the pause overlay, buttons
  switch modes via GameModeManager.TrySwitchTo<T>() and close the panel;
  visibility follows the role-scoped mode set, active mode disabled.
- Esc in paint mode exits to camera mode instead (PlayerControlMode,
  hunter falls back to FirstPersonMode) rather than opening the menu.
- Centralized all Esc handling in OverviewMenu (browser close included)
  to avoid frame races; OnlineSessionBrowserUI gains IsOpen/Open/Close.
- GameModeManager: switchKey Tab-cycle removed, TrySwitchTo<T> added.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/GameMode/GameModeManager.cs

@@ -7,10 +7,11 @@ using UnityEngine.InputSystem;
 #endif
 
 /// <summary>
-/// Switches the game between high-level modes. The switch key (Tab) cycles to the next registered
-/// mode. The mode set is scoped to the local avatar's <see cref="PlayerRole"/> when it spawns
-/// (Hunter: First Person + Paint; Hider: Player Control + Paint + Free Cam); a non-networked scene
-/// uses the full set. Attach to a single, persistent scene GameObject.
+/// Switches the game between high-level modes. Modes are selected via the overview (Esc) menu
+/// (see <see cref="OverviewMenu"/>, which calls <see cref="TrySwitchTo{T}"/>). The mode set is
+/// scoped to the local avatar's <see cref="PlayerRole"/> when it spawns (Hunter: First Person +
+/// Paint; Hider: Player Control + Paint + Free Cam); a non-networked scene uses the full set.
+/// Attach to a single, persistent scene GameObject.
 /// </summary>
 [DisallowMultipleComponent]
 public class GameModeManager : MonoBehaviour
@@ -32,13 +33,6 @@ public class GameModeManager : MonoBehaviour
     public FirstPersonController firstPerson;
 
     [Header("Switching")]
-    [Tooltip("Key that cycles to the next mode.")]
-#if ENABLE_INPUT_SYSTEM
-    public Key switchKey = Key.Tab;
-#else
-    public KeyCode switchKey = KeyCode.Tab;
-#endif
-
     [Tooltip("Mode active at startup (0 = Player Control).")]
     public int startModeIndex = 0;
 
@@ -98,6 +92,25 @@ public class GameModeManager : MonoBehaviour
     public GameMode ActiveMode =>
         (_activeIndex >= 0 && _activeIndex < _modes.Count) ? _modes[_activeIndex] : null;
 
+    /// <summary>The registered role-scoped mode set (read-only; the overview menu builds its buttons from this).</summary>
+    public IReadOnlyList<GameMode> Modes => _modes;
+
+    /// <summary>True while gameplay is suspended for a modal overlay (see <see cref="SetPaused"/>).</summary>
+    public bool IsPaused => _paused;
+
+    /// <summary>The active mode, or - while paused - the mode that will resume. Null in the no-player state.</summary>
+    public GameMode EffectiveMode =>
+        ActiveMode ?? ((_resumeIndex >= 0 && _resumeIndex < _modes.Count) ? _modes[_resumeIndex] : null);
+
+    /// <summary>Switches to the registered mode of type <typeparamref name="T"/>; false if the
+    /// current role-scoped set has none.</summary>
+    public bool TrySwitchTo<T>() where T : GameMode
+    {
+        for (int i = 0; i < _modes.Count; i++)
+            if (_modes[i] is T) { SwitchTo(i); return true; }
+        return false;
+    }
+
     private void Awake()
     {
         if (!player) player = FindFirstObjectByType<PlayerCharacterController>();
@@ -115,7 +128,7 @@ public class GameModeManager : MonoBehaviour
         // Go live only when this scene already holds a player to control (a scene-placed avatar). In the
         // networked Main scene the avatar spawns on connect, so the manager stays inert - no camera control,
         // no mode switching - until BindLocalPlayer promotes it once the lobby avatar exists. Without this,
-        // the pre-spawn menu already lets you orbit the camera and Tab-cycle modes with no player.
+        // the pre-spawn menu already lets you orbit the camera and switch modes with no player.
         if (player && _modes.Count > 0)
             SwitchTo(Mathf.Clamp(startModeIndex, 0, _modes.Count - 1));
         else
@@ -283,7 +296,8 @@ public class GameModeManager : MonoBehaviour
     /// unlock would be reverted next frame) and the cursor freed. Entered at startup in a networked scene
     /// before the lobby avatar spawns, and again after it is gone (see <see cref="ReleaseToNoPlayer"/>).
     /// <see cref="BindLocalPlayer"/> / <see cref="BindSpectator"/> promote out of it. With no active mode
-    /// (_activeIndex &lt; 0) Update ignores the switch key, so Tab cannot bootstrap a mode from here.
+    /// (_activeIndex &lt; 0) Update is inert and the overview menu refuses to open, so nothing can
+    /// bootstrap a mode from here.
     /// </summary>
     private void EnterNoPlayerState()
     {
@@ -358,8 +372,8 @@ public class GameModeManager : MonoBehaviour
 
         if (_paused) return;
         if (_modes.Count == 0) return;
-        // No active mode = the inert no-player state (pre-lobby, or after ReleaseToNoPlayer). Ignore the
-        // switch key and Tick so Tab can't bootstrap a mode and no camera rig is driven until a bind.
+        // No active mode = the inert no-player state (pre-lobby, or after ReleaseToNoPlayer). Skip the
+        // Tick so no camera rig is driven until a bind.
         if (_activeIndex < 0) return;
 
         // Pre-match loading barrier: hold the local player frozen (no movement, painting or mode switching)
@@ -389,27 +403,15 @@ public class GameModeManager : MonoBehaviour
             ActiveMode?.Enter();
         }
 
-        // Resolution (the reveal window) is watch-only: force out of Paint and keep the switch key from
+        // Resolution (the reveal window) is watch-only: force out of Paint and keep mode switching from
         // re-entering. No restore needed - the end-of-match respawn rebuilds the cycle at index 0.
-        bool suppressPaint = PaintSuppressed();
-        if (suppressPaint && ActiveMode is PaintMode)
+        if (PaintSuppressed() && ActiveMode is PaintMode)
         {
             int fallback = FirstNonPaintFrom(0);
             if (fallback >= 0) SwitchTo(fallback);
             else if (painter) painter.PaintingEnabled = false; // degenerate paint-only set: at least stop painting
         }
 
-        if (InputUtil.GameplayKeyPressed(switchKey))
-        {
-            int next = (_activeIndex + 1) % _modes.Count;
-            if (suppressPaint && _modes[next] is PaintMode)
-            {
-                int skip = FirstNonPaintFrom(next);
-                if (skip >= 0) next = skip;
-            }
-            SwitchTo(next);
-        }
-
         // A hider manually pings itself onto every hunter's radar (same blip as the periodic sweep), on demand.
         // Excluded in Free Cam whose fly controls already use this key; the phase/role gate lives in MatchManager
         // (RequestManualPing no-ops outside Seek / for a found hider), so a stray press is harmless.