be28a7d23c
Significantly reorganized frmIndex.vb for better maintainability and readability. Grouped and reordered variable declarations, refactored and clarified key methods (including index handling and file naming), and improved error handling with consistent use of ShowErrorMessage. Enhanced UI event handling, reduced code duplication, and separated concerns between data access, business logic, and UI. Fixed bugs in optional index and vector field handling, improved file/folder operations, and made naming conventions more consistent. Removed redundant code and clarified class/method accessibility. Overall, the code is now more robust, maintainable, and easier to extend.