fix: stand-up-on-move and nameplate position tracking

Camera controller / sitting:
- Any movement key (WASD/QE/Space) pressed while sitting now clears the
  sitting flag immediately, matching WoW's sit-to-stand-on-move behaviour
- Added StandUpCallback: when the player stands up via local input the
  callback fires setStandState(0) → CMSG_STAND_STATE_CHANGE(STAND) so
  the server releases the sit lock and restores normal movement
- Fixes character getting stuck in sit state after accidentally
  right-clicking a chair GO in Goldshire Inn (or similar)

Nameplates:
- Use getRenderPositionForGuid() (renderer visual position) as primary
  source for nameplate anchor, falling back to entity X/Y/Z only when
  no render instance exists yet; keeps health bars in sync with the
  rendered model instead of the parallel entity interpolator

include/rendering/camera_controller.hpp

@@ -90,6 +90,11 @@ public:
     // Movement callback for sending opcodes to server
     using MovementCallback = std::function<void(uint32_t opcode)>;
     void setMovementCallback(MovementCallback cb) { movementCallback = std::move(cb); }
+
+    // Callback invoked when the player stands up via local input (space/X/movement key
+    // while server-sitting), so the caller can send CMSG_STAND_STATE_CHANGE(0).
+    using StandUpCallback = std::function<void()>;
+    void setStandUpCallback(StandUpCallback cb) { standUpCallback_ = std::move(cb); }
     void setUseWoWSpeed(bool use) { useWoWSpeed = use; }
     void setRunSpeedOverride(float speed) { runSpeedOverride_ = speed; }
     void setWalkSpeedOverride(float speed) { walkSpeedOverride_ = speed; }
@@ -265,6 +270,7 @@ private:
 
     // Movement callback
     MovementCallback movementCallback;
+    StandUpCallback standUpCallback_;
 
     // Movement speeds
     bool useWoWSpeed = false;

src/core/application.cpp

@@ -628,6 +628,11 @@ void Application::setState(AppState newState) {
                         gameHandler->sendMovement(static_cast<game::Opcode>(opcode));
                     }
                 });
+                cc->setStandUpCallback([this]() {
+                    if (gameHandler) {
+                        gameHandler->setStandState(0); // CMSG_STAND_STATE_CHANGE(STAND)
+                    }
+                });
                 cc->setUseWoWSpeed(true);
             }
             if (gameHandler) {

src/rendering/camera_controller.cpp

@@ -369,6 +369,7 @@ void CameraController::update(float deltaTime) {
 
     // Toggle sit/crouch with X key (edge-triggered) — only when UI doesn't want keyboard
     // Blocked while mounted
+    bool prevSitting = sitting;
     bool xDown = !uiWantsKeyboard && input.isKeyPressed(SDL_SCANCODE_X);
     if (xDown && !xKeyWasDown && !mounted_) {
         sitting = !sitting;
@@ -376,6 +377,21 @@ void CameraController::update(float deltaTime) {
     if (mounted_) sitting = false;
     xKeyWasDown = xDown;
 
+    // Stand up on any movement key or jump while sitting (WoW behaviour)
+    if (!uiWantsKeyboard && sitting && !movementSuppressed) {
+        bool anyMoveKey =
+            input.isKeyPressed(SDL_SCANCODE_W) || input.isKeyPressed(SDL_SCANCODE_S) ||
+            input.isKeyPressed(SDL_SCANCODE_A) || input.isKeyPressed(SDL_SCANCODE_D) ||
+            input.isKeyPressed(SDL_SCANCODE_Q) || input.isKeyPressed(SDL_SCANCODE_E) ||
+            input.isKeyPressed(SDL_SCANCODE_SPACE);
+        if (anyMoveKey) sitting = false;
+    }
+
+    // Notify server when the player stands up via local input
+    if (prevSitting && !sitting && standUpCallback_) {
+        standUpCallback_();
+    }
+
     // Update eye height based on crouch state (smooth transition)
     float targetEyeHeight = sitting ? CROUCH_EYE_HEIGHT : STAND_EYE_HEIGHT;
     float heightLerpSpeed = 10.0f * deltaTime;
@@ -389,11 +405,6 @@ void CameraController::update(float deltaTime) {
     if (nowStrafeLeft) movement += right;
     if (nowStrafeRight) movement -= right;
 
-    // Stand up if jumping while crouched
-    if (!uiWantsKeyboard && sitting && input.isKeyPressed(SDL_SCANCODE_SPACE)) {
-        sitting = false;
-    }
-
     // Third-person orbit camera mode
     if (thirdPerson && followTarget) {
         // Move the follow target (character position) instead of the camera

src/ui/game_screen.cpp

@@ -5108,9 +5108,13 @@ void GameScreen::renderNameplates(game::GameHandler& gameHandler) {
         // Player nameplates are always shown; NPC nameplates respect the V-key toggle
         if (!isPlayer && !showNameplates_) continue;
 
-        // Convert canonical WoW position → render space, raise to head height
-        glm::vec3 renderPos = core::coords::canonicalToRender(
-            glm::vec3(unit->getX(), unit->getY(), unit->getZ()));
+        // Prefer the renderer's actual instance position so the nameplate tracks the
+        // rendered model exactly (avoids drift from the parallel entity interpolator).
+        glm::vec3 renderPos;
+        if (!core::Application::getInstance().getRenderPositionForGuid(guid, renderPos)) {
+            renderPos = core::coords::canonicalToRender(
+                glm::vec3(unit->getX(), unit->getY(), unit->getZ()));
+        }
         renderPos.z += 2.3f;
 
         // Cull distance: target or other players up to 40 units; NPC others up to 20 units