fix: guard std::stoi/stof calls at input boundaries against exceptions

Wrap string-to-number conversions in try-catch where input comes from
external sources (realm address port, last_world.cfg, keybinding config,
ADT tile filenames) to prevent crashes on malformed data.

src/core/application.cpp

@@ -2232,7 +2232,8 @@ void Application::setupUICallbacks() {
         size_t colonPos = realmAddress.find(':');
         if (colonPos != std::string::npos) {
             host = realmAddress.substr(0, colonPos);
-            port = static_cast<uint16_t>(std::stoi(realmAddress.substr(colonPos + 1)));
+            try { port = static_cast<uint16_t>(std::stoi(realmAddress.substr(colonPos + 1))); }
+            catch (...) { LOG_WARNING("Invalid port in realm address: ", realmAddress); }
         }
 
         // Connect to world server
@@ -9715,10 +9716,15 @@ Application::LastWorldInfo Application::loadLastWorldInfo() const {
     std::ifstream f(dir + "/last_world.cfg");
     if (!f) return info;
     std::string line;
+    try {
         if (std::getline(f, line)) info.mapId = static_cast<uint32_t>(std::stoul(line));
         if (std::getline(f, line)) info.mapName = line;
         if (std::getline(f, line)) info.x = std::stof(line);
         if (std::getline(f, line)) info.y = std::stof(line);
+    } catch (...) {
+        LOG_WARNING("Malformed last_world.cfg, ignoring saved position");
+        return info;
+    }
     info.valid = !info.mapName.empty();
     return info;
 }

src/rendering/renderer.cpp

@@ -6036,8 +6036,12 @@ bool Renderer::loadTestTerrain(pipeline::AssetManager* assetManager, const std::
                 if (secondUnderscore != std::string::npos) {
                     size_t dot = filename.find('.', secondUnderscore);
                     if (dot != std::string::npos) {
+                        try {
                             tileX = std::stoi(filename.substr(firstUnderscore + 1, secondUnderscore - firstUnderscore - 1));
                             tileY = std::stoi(filename.substr(secondUnderscore + 1, dot - secondUnderscore - 1));
+                        } catch (...) {
+                            LOG_WARNING("Failed to parse tile coords from: ", filename);
+                        }
                     }
                 }
             }

src/ui/keybinding_manager.cpp

@@ -192,10 +192,12 @@ void KeybindingManager::loadFromConfigFile(const std::string& filePath) {
             key = ImGuiKey_End;
         } else if (keyStr.find("F") == 0 && keyStr.length() <= 3) {
             // F1-F12 keys
+            try {
                 int fNum = std::stoi(keyStr.substr(1));
                 if (fNum >= 1 && fNum <= 12) {
                     key = static_cast<ImGuiKey>(ImGuiKey_F1 + (fNum - 1));
                 }
+            } catch (...) {}
         }
 
         if (key == ImGuiKey_None) continue;