feat: add instance difficulty indicator on minimap

Show Normal/Heroic/25-Man difficulty badge below zone name when inside
a dungeon or raid instance. Orange-highlighted for heroic modes.

include/game/game_handler.hpp

@@ -1230,6 +1230,11 @@ public:
     void closeBarberShop() { barberShopOpen_ = false; }
     void sendAlterAppearance(uint32_t hairStyle, uint32_t hairColor, uint32_t facialHair);
 
+    // Instance difficulty (0=5N, 1=5H, 2=25N, 3=25H for WotLK)
+    uint32_t getInstanceDifficulty() const { return instanceDifficulty_; }
+    bool isInstanceHeroic() const { return instanceIsHeroic_; }
+    bool isInInstance() const { return inInstance_; }
+
     /** True when ghost is within 40 yards of corpse position (same map). */
     bool canReclaimCorpse() const;
     /** Seconds remaining on the PvP corpse-reclaim delay, or 0 if the reclaim is available now. */
@@ -2867,6 +2872,7 @@ private:
     // Instance difficulty
     uint32_t instanceDifficulty_ = 0;
     bool instanceIsHeroic_ = false;
+    bool inInstance_ = false;
 
     // Raid target markers (icon 0-7 -> guid; 0 = empty slot)
     std::array<uint64_t, kRaidMarkCount> raidTargetGuids_ = {};

src/game/game_handler.cpp

@@ -16458,6 +16458,7 @@ void GameHandler::handleInstanceDifficulty(network::Packet& packet) {
     } else {
         instanceIsHeroic_ = (instanceDifficulty_ == 1);
     }
+    inInstance_ = true;
     LOG_INFO("Instance difficulty: ", instanceDifficulty_, " heroic=", instanceIsHeroic_);
 
     // Announce difficulty change to the player (only when it actually changes)
@@ -22386,6 +22387,7 @@ void GameHandler::handleNewWorld(network::Packet& packet) {
     }
 
     currentMapId_ = mapId;
+    inInstance_ = false;  // cleared on map change; re-set if SMSG_INSTANCE_DIFFICULTY follows
     if (socket) {
         socket->tracePacketsFor(std::chrono::seconds(12), "new_world");
     }

src/ui/game_screen.cpp

@@ -19650,6 +19650,31 @@ void GameScreen::renderMinimapMarkers(game::GameHandler& gameHandler) {
         }
     }
 
+    // Instance difficulty indicator — just below zone name, inside minimap top edge
+    if (gameHandler.isInInstance()) {
+        static const char* kDiffLabels[] = {"Normal", "Heroic", "25 Normal", "25 Heroic"};
+        uint32_t diff = gameHandler.getInstanceDifficulty();
+        const char* label = (diff < 4) ? kDiffLabels[diff] : "Unknown";
+
+        ImFont* font = ImGui::GetFont();
+        float fontSize = ImGui::GetFontSize() * 0.85f;
+        ImVec2 ts = font->CalcTextSizeA(fontSize, FLT_MAX, 0.0f, label);
+        float tx = centerX - ts.x * 0.5f;
+        // Position below zone name: top edge + zone font size + small gap
+        float ty = centerY - mapRadius + 4.0f + ImGui::GetFontSize() + 2.0f;
+        float pad = 2.0f;
+
+        // Color-code: heroic=orange, normal=light gray
+        ImU32 bgCol = gameHandler.isInstanceHeroic() ? IM_COL32(120, 60, 0, 180) : IM_COL32(0, 0, 0, 160);
+        ImU32 textCol = gameHandler.isInstanceHeroic() ? IM_COL32(255, 180, 50, 255) : IM_COL32(200, 200, 200, 220);
+
+        drawList->AddRectFilled(
+            ImVec2(tx - pad, ty - pad),
+            ImVec2(tx + ts.x + pad, ty + ts.y + pad),
+            bgCol, 2.0f);
+        drawList->AddText(font, fontSize, ImVec2(tx, ty), textCol, label);
+    }
+
     // Hover tooltip and right-click context menu
     {
         ImVec2 mouse = ImGui::GetMousePos();