Auto-select newly created character in selection screen

After creating a character, automatically select it in the character
list instead of defaulting to the previously selected character.

Changes:
- Added selectCharacterByName() method to CharacterScreen
- Store created character name in Application
- On creation success, auto-select the new character by name
- Falls back to saved selection if new character name doesn't match

include/core/application.hpp

@@ -107,6 +107,7 @@ private:
 
     AppState state = AppState::AUTHENTICATION;
     bool running = false;
+    std::string pendingCreatedCharacterName_;  // Auto-select after character creation
     bool playerCharacterSpawned = false;
     bool npcsSpawned = false;
     bool spawnSnapToGround = true;

include/ui/character_screen.hpp

@@ -49,12 +49,18 @@ public:
      */
     void setStatus(const std::string& message);
 
+    /**
+     * Select character by name (used after character creation)
+     */
+    void selectCharacterByName(const std::string& name);
+
 private:
     // UI state
     int selectedCharacterIndex = -1;
     bool characterSelected = false;
     uint64_t selectedCharacterGuid = 0;
     bool restoredLastCharacter = false;
+    std::string newlyCreatedCharacterName;  // Auto-select this character if set
 
     // Status
     std::string statusMessage;