Add damage flash toggle setting and fix map explored zone reveal

Persist damage_flash to settings.cfg; checkbox in Interface > Screen Effects.
Fix world map fog: trust server exploration mask unconditionally when present,
always reveal the current zone immediately regardless of server mask state.

include/ui/game_screen.hpp

@@ -74,6 +74,7 @@ private:
     ImVec2 nameplateCtxPos_{};      // Screen position of nameplate right-click
     uint32_t lastPlayerHp_ = 0;   // Previous frame HP for damage flash detection
     float damageFlashAlpha_ = 0.0f; // Screen edge flash intensity (fades to 0)
+    bool  damageFlashEnabled_ = true;
     float levelUpFlashAlpha_ = 0.0f; // Golden level-up burst effect (fades to 0)
     uint32_t levelUpDisplayLevel_ = 0; // Level shown in level-up text
 

src/rendering/world_map.cpp

@@ -752,7 +752,6 @@ void WorldMap::updateExploration(const glm::vec3& playerRenderPos) {
         return (serverExplorationMask[word] & (1u << (bitIndex % 32))) != 0;
     };
 
-    bool markedAny = false;
     if (hasServerExplorationMask) {
         exploredZones.clear();
         for (int i = 0; i < static_cast<int>(zones.size()); i++) {
@@ -761,15 +760,19 @@ void WorldMap::updateExploration(const glm::vec3& playerRenderPos) {
             for (uint32_t bit : z.exploreBits) {
                 if (isBitSet(bit)) {
                     exploredZones.insert(i);
-                    markedAny = true;
                     break;
                 }
             }
         }
+        // Always trust the server mask when available — even if empty (unexplored character).
+        // Also reveal the zone the player is currently standing in so the map isn't pitch-black
+        // the moment they first enter a new zone (the server bit arrives on the next update).
+        int curZone = findZoneForPlayer(playerRenderPos);
+        if (curZone >= 0) exploredZones.insert(curZone);
+        return;
     }
-    if (markedAny) return;
 
-    // Server mask unavailable or empty — fall back to locally-accumulated position tracking.
+    // Server mask unavailable — fall back to locally-accumulated position tracking.
     // Add the zone the player is currently in to the local set and display that.
     float wowX = playerRenderPos.y;
     float wowY = playerRenderPos.x;

src/ui/game_screen.cpp

@@ -709,7 +709,7 @@ void GameScreen::render(game::GameHandler& gameHandler) {
         }
 
         // Detect HP drop (ignore transitions from 0 — entity just spawned or uninitialized)
-        if (lastPlayerHp_ > 0 && currentHp < lastPlayerHp_ && currentHp > 0)
+        if (damageFlashEnabled_ && lastPlayerHp_ > 0 && currentHp < lastPlayerHp_ && currentHp > 0)
             damageFlashAlpha_ = 1.0f;
         lastPlayerHp_ = currentHp;
 
@@ -10626,6 +10626,16 @@ void GameScreen::renderSettingsWindow() {
                 ImGui::SameLine();
                 ImGui::TextDisabled("(ms indicator near minimap)");
 
+                ImGui::Spacing();
+                ImGui::SeparatorText("Screen Effects");
+                ImGui::Spacing();
+                if (ImGui::Checkbox("Damage Flash", &damageFlashEnabled_)) {
+                    if (!damageFlashEnabled_) damageFlashAlpha_ = 0.0f;
+                    saveSettings();
+                }
+                ImGui::SameLine();
+                ImGui::TextDisabled("(red vignette on taking damage)");
+
                 ImGui::EndChild();
                 ImGui::EndTabItem();
             }
@@ -12290,6 +12300,7 @@ void GameScreen::saveSettings() {
     out << "show_left_bar=" << (pendingShowLeftBar ? 1 : 0) << "\n";
     out << "right_bar_offset_y=" << pendingRightBarOffsetY << "\n";
     out << "left_bar_offset_y=" << pendingLeftBarOffsetY << "\n";
+    out << "damage_flash=" << (damageFlashEnabled_ ? 1 : 0) << "\n";
 
     // Audio
     out << "sound_muted=" << (soundMuted_ ? 1 : 0) << "\n";
@@ -12407,6 +12418,8 @@ void GameScreen::loadSettings() {
                 pendingRightBarOffsetY = std::clamp(std::stof(val), -400.0f, 400.0f);
             } else if (key == "left_bar_offset_y") {
                 pendingLeftBarOffsetY = std::clamp(std::stof(val), -400.0f, 400.0f);
+            } else if (key == "damage_flash") {
+                damageFlashEnabled_ = (std::stoi(val) != 0);
             }
             // Audio
             else if (key == "sound_muted") {