perf: eliminate per-frame heap allocs in M2 renderer; UI polish and report

M2 renderer: move 3 per-frame local containers to member variables:
- particleGroups_ (unordered_map): reuse bucket structure across frames
- ribbonDraws_ (vector): reuse draw call buffer
- shadowTexSetCache_ (unordered_map): reuse descriptor cache
Eliminates ~3 heap allocations per frame in particle/ribbon/shadow passes.

UI polish:
- Nameplate hover tooltip showing level, class (players), guild name
- Bag window titles show slot counts: "Backpack (12/16)"

Player report: CMSG_COMPLAIN packet builder and reportPlayer() method.
"Report Player" option in target frame right-click menu for other players.
Server response handler (SMSG_COMPLAIN_RESULT) was already implemented.

include/game/game_handler.hpp

@@ -718,6 +718,7 @@ public:
     // Combat and Trade
     void proposeDuel(uint64_t targetGuid);
     void initiateTrade(uint64_t targetGuid);
+    void reportPlayer(uint64_t targetGuid, const std::string& reason);
     void stopCasting();
 
     // ---- Phase 1: Name queries ----

include/game/world_packets.hpp

@@ -904,6 +904,12 @@ public:
     static network::Packet build(uint64_t ignoreGuid);
 };
 
+/** CMSG_COMPLAIN packet builder (player report) */
+class ComplainPacket {
+public:
+    static network::Packet build(uint64_t targetGuid, const std::string& reason);
+};
+
 // ============================================================
 // Logout Commands
 // ============================================================

include/rendering/m2_renderer.hpp

@@ -550,6 +550,49 @@ private:
     };
     std::vector<GlowSprite> glowSprites_;  // Reused each frame
 
+    // Shadow-pass texture descriptor cache (reused each frame, cleared via pool reset)
+    std::unordered_map<VkImageView, VkDescriptorSet> shadowTexSetCache_;
+
+    // Ribbon draw-call list (reused each frame)
+    struct RibbonDrawCall {
+        VkDescriptorSet texSet;
+        VkPipeline      pipeline;
+        uint32_t        firstVertex;
+        uint32_t        vertexCount;
+    };
+    std::vector<RibbonDrawCall> ribbonDraws_;
+
+    // Particle group structures (reused each frame)
+    struct ParticleGroupKey {
+        VkTexture* texture;
+        uint8_t blendType;
+        uint16_t tilesX;
+        uint16_t tilesY;
+        bool operator==(const ParticleGroupKey& other) const {
+            return texture == other.texture &&
+                   blendType == other.blendType &&
+                   tilesX == other.tilesX &&
+                   tilesY == other.tilesY;
+        }
+    };
+    struct ParticleGroupKeyHash {
+        size_t operator()(const ParticleGroupKey& key) const {
+            size_t h1 = std::hash<uintptr_t>{}(reinterpret_cast<uintptr_t>(key.texture));
+            size_t h2 = std::hash<uint32_t>{}((static_cast<uint32_t>(key.tilesX) << 16) | key.tilesY);
+            size_t h3 = std::hash<uint8_t>{}(key.blendType);
+            return h1 ^ (h2 * 0x9e3779b9u) ^ (h3 * 0x85ebca6bu);
+        }
+    };
+    struct ParticleGroup {
+        VkTexture* texture;
+        uint8_t blendType;
+        uint16_t tilesX;
+        uint16_t tilesY;
+        VkDescriptorSet preAllocSet = VK_NULL_HANDLE;
+        std::vector<float> vertexData;
+    };
+    std::unordered_map<ParticleGroupKey, ParticleGroup, ParticleGroupKeyHash> particleGroups_;
+
     // Animation update buffers (avoid per-frame allocation)
     std::vector<size_t> boneWorkIndices_;        // Reused each frame
     std::vector<std::future<void>> animFutures_; // Reused each frame

src/game/game_handler.cpp

@@ -13784,6 +13784,23 @@ void GameHandler::initiateTrade(uint64_t targetGuid) {
     LOG_INFO("Initiated trade with target: 0x", std::hex, targetGuid, std::dec);
 }
 
+void GameHandler::reportPlayer(uint64_t targetGuid, const std::string& reason) {
+    if (!isInWorld()) {
+        LOG_WARNING("Cannot report player: not in world or not connected");
+        return;
+    }
+
+    if (targetGuid == 0) {
+        addSystemChatMessage("You must target a player to report.");
+        return;
+    }
+
+    auto packet = ComplainPacket::build(targetGuid, reason);
+    socket->send(packet);
+    addSystemChatMessage("Player report submitted.");
+    LOG_INFO("Reported player: 0x", std::hex, targetGuid, std::dec, " reason=", reason);
+}
+
 void GameHandler::stopCasting() {
     if (!isInWorld()) {
         LOG_WARNING("Cannot stop casting: not in world or not connected");

src/game/world_packets.cpp

@@ -1908,6 +1908,19 @@ network::Packet DelIgnorePacket::build(uint64_t ignoreGuid) {
     return packet;
 }
 
+network::Packet ComplainPacket::build(uint64_t targetGuid, const std::string& reason) {
+    network::Packet packet(wireOpcode(Opcode::CMSG_COMPLAIN));
+    packet.writeUInt8(1);               // complaintType: 1 = spam
+    packet.writeUInt64(targetGuid);
+    packet.writeUInt32(0);              // unk
+    packet.writeUInt32(0);              // messageType
+    packet.writeUInt32(0);              // channelId
+    packet.writeUInt32(static_cast<uint32_t>(time(nullptr))); // timestamp
+    packet.writeString(reason);
+    LOG_DEBUG("Built CMSG_COMPLAIN: target=0x", std::hex, targetGuid, std::dec, " reason=", reason);
+    return packet;
+}
+
 // ============================================================
 // Logout Commands
 // ============================================================

src/rendering/m2_renderer.cpp

@@ -2998,7 +2998,9 @@ void M2Renderer::renderShadow(VkCommandBuffer cmd, const glm::mat4& lightSpaceMa
         vkResetDescriptorPool(vkCtx_->getDevice(), shadowTexPool_, 0);
     }
     // Cache: texture imageView -> allocated descriptor set (avoids duplicates within frame)
-    std::unordered_map<VkImageView, VkDescriptorSet> texSetCache;
+    // Reuse persistent map — pool reset already invalidated the sets.
+    shadowTexSetCache_.clear();
+    auto& texSetCache = shadowTexSetCache_;
 
     auto getTexDescSet = [&](VkTexture* tex) -> VkDescriptorSet {
         VkImageView iv = tex->getImageView();
@@ -3425,13 +3427,8 @@ void M2Renderer::renderM2Ribbons(VkCommandBuffer cmd, VkDescriptorSet perFrameSe
     float* dst     = static_cast<float*>(ribbonVBMapped_);
     size_t written = 0;
 
-    struct DrawCall {
-        VkDescriptorSet texSet;
-        VkPipeline      pipeline;
-        uint32_t        firstVertex;
-        uint32_t        vertexCount;
-    };
-    std::vector<DrawCall> draws;
+    ribbonDraws_.clear();
+    auto& draws = ribbonDraws_;
 
     for (const auto& inst : instances) {
         if (!inst.cachedModel) continue;
@@ -3539,36 +3536,12 @@ void M2Renderer::renderM2Particles(VkCommandBuffer cmd, VkDescriptorSet perFrame
     if (!particlePipeline_ || !m2ParticleVB_) return;
 
     // Collect all particles from all instances, grouped by texture+blend
-    struct ParticleGroupKey {
-        VkTexture* texture;
-        uint8_t blendType;
-        uint16_t tilesX;
-        uint16_t tilesY;
-
-        bool operator==(const ParticleGroupKey& other) const {
-            return texture == other.texture &&
-                   blendType == other.blendType &&
-                   tilesX == other.tilesX &&
-                   tilesY == other.tilesY;
+    // Reuse persistent map — clear each group's vertex data but keep bucket structure.
+    for (auto& [k, g] : particleGroups_) {
+        g.vertexData.clear();
+        g.preAllocSet = VK_NULL_HANDLE;
     }
-    };
-    struct ParticleGroupKeyHash {
-        size_t operator()(const ParticleGroupKey& key) const {
-            size_t h1 = std::hash<uintptr_t>{}(reinterpret_cast<uintptr_t>(key.texture));
-            size_t h2 = std::hash<uint32_t>{}((static_cast<uint32_t>(key.tilesX) << 16) | key.tilesY);
-            size_t h3 = std::hash<uint8_t>{}(key.blendType);
-            return h1 ^ (h2 * 0x9e3779b9u) ^ (h3 * 0x85ebca6bu);
-        }
-    };
-    struct ParticleGroup {
-        VkTexture* texture;
-        uint8_t blendType;
-        uint16_t tilesX;
-        uint16_t tilesY;
-        VkDescriptorSet preAllocSet = VK_NULL_HANDLE;  // Pre-allocated stable set, avoids per-frame alloc
-        std::vector<float> vertexData;  // 9 floats per particle
-    };
-    std::unordered_map<ParticleGroupKey, ParticleGroup, ParticleGroupKeyHash> groups;
+    auto& groups = particleGroups_;
 
     size_t totalParticles = 0;
 

src/ui/game_screen.cpp

@@ -4271,6 +4271,8 @@ void GameScreen::renderTargetFrame(game::GameHandler& gameHandler) {
                     gameHandler.addFriend(name);
                 if (ImGui::MenuItem("Ignore"))
                     gameHandler.addIgnore(name);
+                if (ImGui::MenuItem("Report Player"))
+                    gameHandler.reportPlayer(tGuid, "Reported via UI");
             }
             ImGui::Separator();
             if (ImGui::BeginMenu("Set Raid Mark")) {
@@ -12181,6 +12183,17 @@ void GameScreen::renderNameplates(game::GameHandler& gameHandler) {
             if (mouse.x >= nx0 && mouse.x <= nx1 && mouse.y >= ny0 && mouse.y <= ny1) {
                 // Track mouseover for [target=mouseover] macro conditionals
                 gameHandler.setMouseoverGuid(guid);
+                // Hover tooltip: name, level/class, guild
+                ImGui::BeginTooltip();
+                ImGui::TextUnformatted(unitName.c_str());
+                if (isPlayer) {
+                    uint8_t cid = entityClassId(unit);
+                    ImGui::Text("Level %u %s", level, classNameStr(cid));
+                } else if (level > 0) {
+                    ImGui::Text("Level %u", level);
+                }
+                if (!subLabel.empty()) ImGui::TextColored(ImVec4(0.7f,0.7f,0.7f,1.0f), "%s", subLabel.c_str());
+                ImGui::EndTooltip();
                 if (ImGui::IsMouseClicked(ImGuiMouseButton_Left)) {
                     gameHandler.setTarget(guid);
                 } else if (ImGui::IsMouseClicked(ImGuiMouseButton_Right)) {

src/ui/inventory_screen.cpp

@@ -985,10 +985,15 @@ void InventoryScreen::renderSeparateBags(game::Inventory& inventory, uint64_t mo
 
     // Backpack window (bottom of stack)
     if (backpackOpen_) {
-        int bpRows = (inventory.getBackpackSize() + columns - 1) / columns;
+        int bpTotal = inventory.getBackpackSize();
+        int bpUsed = 0;
+        for (int i = 0; i < bpTotal; ++i) if (!inventory.getBackpackSlot(i).empty()) ++bpUsed;
+        char bpTitle[64];
+        snprintf(bpTitle, sizeof(bpTitle), "Backpack (%d/%d)", bpUsed, bpTotal);
+        int bpRows = (bpTotal + columns - 1) / columns;
         float bpH = bpRows * (slotSize + 4.0f) + 80.0f; // header + money + padding
         float defaultY = stackBottom - bpH;
-        renderBagWindow("Backpack", backpackOpen_, inventory, -1, stackX, defaultY, moneyCopper);
+        renderBagWindow(bpTitle, backpackOpen_, inventory, -1, stackX, defaultY, moneyCopper);
         stackBottom = defaultY - stackGap;
     }
 
@@ -1010,14 +1015,16 @@ void InventoryScreen::renderSeparateBags(game::Inventory& inventory, uint64_t mo
         float defaultY = stackBottom - bagH;
         stackBottom = defaultY - stackGap;
 
-        // Build title from equipped bag item name
-        char title[64];
+        // Build title from equipped bag item name, with used/total slot counts
+        int bagUsed = 0;
+        for (int si = 0; si < bagSize; ++si) if (!inventory.getBagSlot(bag, si).empty()) ++bagUsed;
+        char title[96];
         game::EquipSlot bagSlot = static_cast<game::EquipSlot>(static_cast<int>(game::EquipSlot::BAG1) + bag);
         const auto& bagItem = inventory.getEquipSlot(bagSlot);
         if (!bagItem.empty() && !bagItem.item.name.empty()) {
-            snprintf(title, sizeof(title), "%s##bag%d", bagItem.item.name.c_str(), bag);
+            snprintf(title, sizeof(title), "%s (%d/%d)##bag%d", bagItem.item.name.c_str(), bagUsed, bagSize, bag);
         } else {
-            snprintf(title, sizeof(title), "Bag Slot %d##bag%d", bag + 1, bag);
+            snprintf(title, sizeof(title), "Bag Slot %d (%d/%d)##bag%d", bag + 1, bagUsed, bagSize, bag);
         }
 
         renderBagWindow(title, bagOpen_[bag], inventory, bag, stackX, defaultY, 0);