feat(world-map): remove kVOffset hack, ZMP hover, textured player arrow

- Remove the -0.15 vertical offset (kVOffset) from coordinate_projection,
  coordinate_display, and zone_highlight_layer; continent UV math is now
  identical to zone UV math
- Switch world_map_facade aspect ratio to MAP_W/MAP_H (1002×668) and crop
  the FBO image with MAP_U_MAX/MAP_V_MAX instead of stretching the full
  1024×768 FBO
- Account for ImGui title bar height (GetFrameHeight) in window sizing and
  zone highlight screen-space rect coordinates
- Add ZMP 128×128 grid pixel-accurate hover detection in zone_highlight_layer;
  falls back to AABB when ZMP data is unavailable
- Upgrade PlayerMarkerLayer with full Vulkan lifecycle (initialize,
  clearTexture, destructor); loads MinimapArrow.blp and renders a rotated
  32×32 textured quad via AddImageQuad; red triangle retained as fallback
- Expose arrowRotation_ / arrowDS_ accessors on Minimap; clean up arrow DS
  and texture in Minimap::shutdown()
- Wire PlayerMarkerLayer::initialize() into WorldMapFacade::initialize()
- Update coordinate-projection test: continent and zone UV are now equal

Signed-off-by: Pavel Okhlopkov <pavel.okhlopkov@flant.com>

include/rendering/world_map/layers/player_marker_layer.hpp

@@ -1,14 +1,33 @@
 // player_marker_layer.hpp — Directional player arrow on the world map.
 #pragma once
 #include "rendering/world_map/overlay_renderer.hpp"
+#include "rendering/vk_texture.hpp"
+#include <vulkan/vulkan.h>
+#include <memory>
 
 namespace wowee {
 namespace rendering {
+class VkContext;
+}
+namespace pipeline { class AssetManager; }
+namespace rendering {
 namespace world_map {
 
 class PlayerMarkerLayer : public IOverlayLayer {
 public:
+    ~PlayerMarkerLayer() override;
+    void initialize(VkContext* ctx, pipeline::AssetManager* am);
+    void clearTexture();
     void render(const LayerContext& ctx) override;
+
+private:
+    void ensureTexture();
+
+    VkContext* vkCtx_ = nullptr;
+    pipeline::AssetManager* assetManager_ = nullptr;
+    std::unique_ptr<VkTexture> texture_;
+    VkDescriptorSet imguiDS_ = VK_NULL_HANDLE;
+    bool loadAttempted_ = false;
 };
 
 } // namespace world_map