physics: block client-side movement when server roots the player

When SMSG_FORCE_MOVE_ROOT sets ROOT in movementInfo.flags, the
camera controller was not aware and continued to accept directional
input. This caused position desync (client moves, server sees player
as rooted).

- Add movementRooted_ flag to CameraController with setter/getter.
- Block nowForward/nowBackward/nowStrafe when movementRooted_ is set.
- Sync isPlayerRooted() from GameHandler to CameraController each
  frame alongside the existing run-speed sync in application.cpp.
- Add GameHandler::isPlayerRooted() convenience accessor.

include/game/game_handler.hpp

@@ -1152,6 +1152,9 @@ public:
     bool isMounted() const { return currentMountDisplayId_ != 0; }
     bool isHostileAttacker(uint64_t guid) const { return hostileAttackers_.count(guid) > 0; }
     float getServerRunSpeed() const { return serverRunSpeed_; }
+    bool isPlayerRooted() const {
+        return (movementInfo.flags & static_cast<uint32_t>(MovementFlags::ROOT)) != 0;
+    }
     void dismount();
 
     // Taxi / Flight Paths

include/rendering/camera_controller.hpp

@@ -92,6 +92,8 @@ public:
     void setMovementCallback(MovementCallback cb) { movementCallback = std::move(cb); }
     void setUseWoWSpeed(bool use) { useWoWSpeed = use; }
     void setRunSpeedOverride(float speed) { runSpeedOverride_ = speed; }
+    void setMovementRooted(bool rooted) { movementRooted_ = rooted; }
+    bool isMovementRooted() const { return movementRooted_; }
     void setMounted(bool m) { mounted_ = m; }
     void setMountHeightOffset(float offset) { mountHeightOffset_ = offset; }
     void setExternalFollow(bool enabled) { externalFollow_ = enabled; }
@@ -268,6 +270,8 @@ private:
 
     // Server-driven run speed override (0 = use default WOW_RUN_SPEED)
     float runSpeedOverride_ = 0.0f;
+    // Server-driven root state: when true, block all horizontal movement input.
+    bool movementRooted_ = false;
     bool mounted_ = false;
     float mountHeightOffset_ = 0.0f;
     bool externalMoving_ = false;

src/core/application.cpp

@@ -1009,6 +1009,7 @@ void Application::update(float deltaTime) {
             runInGameStage("post-update sync", [&] {
                 if (renderer && gameHandler && renderer->getCameraController()) {
                     renderer->getCameraController()->setRunSpeedOverride(gameHandler->getServerRunSpeed());
+                    renderer->getCameraController()->setMovementRooted(gameHandler->isPlayerRooted());
                 }
 
                 bool onTaxi = gameHandler &&

src/rendering/camera_controller.cpp

@@ -275,8 +275,10 @@ void CameraController::update(float deltaTime) {
     if (mouseAutorun) {
         autoRunning = false;
     }
-    bool nowForward = keyW || mouseAutorun || autoRunning;
-    bool nowBackward = keyS;
+    // When the server has rooted the player, suppress all horizontal movement input.
+    const bool movBlocked = movementRooted_;
+    bool nowForward = !movBlocked && (keyW || mouseAutorun || autoRunning);
+    bool nowBackward = !movBlocked && keyS;
     bool nowStrafeLeft = false;
     bool nowStrafeRight = false;
     bool nowTurnLeft = false;