Add teleporter panel and server-compatible coordinate conversions

Teleporter panel (T key) lets the player teleport between Goldshire,
Stormwind Gate, Ironforge, and Westfall in single-player mode. Adds
serverToCanonical/canonicalToServer conversion at the network packet
boundary so positions are compatible with TrinityCore/MaNGOS/AzerothCore
emulator servers.

include/core/application.hpp

@@ -60,6 +60,9 @@ public:
     // Weapon loading (called at spawn and on equipment change)
     void loadEquippedWeapons();
 
+    // Teleport to a spawn preset location (single-player only)
+    void teleportTo(int presetIndex);
+
     // Character skin composite state (saved at spawn for re-compositing on equipment change)
     const std::string& getBodySkinPath() const { return bodySkinPath_; }
     const std::vector<std::string>& getUnderwearPaths() const { return underwearPaths_; }

include/core/coordinates.hpp

@@ -24,6 +24,24 @@ inline constexpr float ZEROPOINT = 32.0f * TILE_SIZE;
 //   Range [0, 34133.333] with center at ZEROPOINT (17066.666).
 //   adtY = height; adtX/adtZ are horizontal.
 
+// ---- Server / emulator coordinate system ----
+//   WoW emulators (TrinityCore, MaNGOS, AzerothCore, CMaNGOS) send positions
+//   over the wire as (X, Y, Z) where:
+//     server.X = canonical.Y (west axis)
+//     server.Y = canonical.X (north axis)
+//     server.Z = canonical.Z (height)
+//   This is also the byte order inside movement packets on the wire.
+
+// Convert server/wire coordinates → canonical WoW coordinates.
+inline glm::vec3 serverToCanonical(const glm::vec3& server) {
+    return glm::vec3(server.y, server.x, server.z);
+}
+
+// Convert canonical WoW coordinates → server/wire coordinates.
+inline glm::vec3 canonicalToServer(const glm::vec3& canonical) {
+    return glm::vec3(canonical.y, canonical.x, canonical.z);
+}
+
 // Convert between canonical WoW and engine rendering coordinates (just swap X/Y).
 inline glm::vec3 canonicalToRender(const glm::vec3& wow) {
     return glm::vec3(wow.y, wow.x, wow.z);

include/core/spawn_presets.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <glm/glm.hpp>
+
+namespace wowee::core {
+
+struct SpawnPreset {
+    const char* key;
+    const char* label;
+    const char* mapName;        // Map name for ADT paths (e.g., "Azeroth")
+    glm::vec3 spawnCanonical;   // Canonical WoW coords: +X=North, +Y=West, +Z=Up
+    float yawDeg;
+    float pitchDeg;
+};
+
+// Spawn positions in canonical WoW world coordinates (X=north, Y=west, Z=up).
+// Tile is computed from position via: tileN = floor(32 - wowN / 533.33333)
+inline const SpawnPreset SPAWN_PRESETS[] = {
+    {"goldshire",  "Goldshire",      "Azeroth", glm::vec3(   62.0f, -9464.0f, 200.0f), 0.0f, -5.0f},
+    {"stormwind",  "Stormwind Gate", "Azeroth", glm::vec3(  425.0f, -9176.0f, 120.0f), 35.0f, -8.0f},
+    {"ironforge",  "Ironforge",      "Azeroth", glm::vec3( -882.0f, -4981.0f, 510.0f), -20.0f, -8.0f},
+    {"westfall",   "Westfall",       "Azeroth", glm::vec3( 1215.0f,-10440.0f,  80.0f), 10.0f, -8.0f},
+};
+
+inline constexpr int SPAWN_PRESET_COUNT = 4;
+
+} // namespace wowee::core

include/ui/game_screen.hpp

@@ -29,6 +29,16 @@ public:
      */
     bool isChatInputActive() const { return chatInputActive; }
 
+    /**
+     * Toggle the teleporter panel
+     */
+    void toggleTeleporter() { showTeleporter = !showTeleporter; }
+
+    /**
+     * Check if teleporter panel is open
+     */
+    bool isTeleporterOpen() const { return showTeleporter; }
+
 private:
     // Chat state
     char chatInputBuffer[512] = "";
@@ -40,6 +50,7 @@ private:
     bool showChatWindow = true;
     bool showPlayerInfo = false;
     bool refocusChatInput = false;
+    bool showTeleporter = false;
 
     /**
      * Render player info window
@@ -106,6 +117,7 @@ private:
     void renderLootWindow(game::GameHandler& gameHandler);
     void renderGossipWindow(game::GameHandler& gameHandler);
     void renderVendorWindow(game::GameHandler& gameHandler);
+    void renderTeleporterPanel();
 
     /**
      * Inventory screen