fix: duplicate member declarations in SettingsView header

- Removed duplicate m_accountService and m_selectedAccountId declarations
- Fixed indentation in private section (removed extra spaces)
- All member variables now declared once with proper initialization

src/ui/settingsview.h

@@ -131,9 +131,6 @@ private:
     QPushButton *m_addBtn;
     QPushButton *m_deleteBtn;
 
-    AccountService *m_accountService;
-    int m_selectedAccountId;
-
     // Categories
     QTreeWidget *m_categoryTree;
     QPushButton *m_categoryAddBtn;