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- Added 29 section markers to group related functionality
- No code changes, only organizational comments
- Preparation for future refactoring to break down the 9800+ line file
- Sections include: Navigation, Column Operations, Yank, Rendering, etc.
- Created enhanced_tui_helpers.rs for pure functions
- Moved sanitize_table_name (1 of 7 pure functions)
- Reduced enhanced_tui.rs by 33 lines
- This is the first step in reducing coupling in the TUI
- Added apply_row_navigation_result() helper to consolidate state updates
- Simplified next_row() from 29 lines to 11 lines
- This removes the duplicated state updates that were in every navigation method
- Navigation now has a single place where state is synchronized

This is the first step in reducing coupling in navigation. The pattern:
1. Call ViewportManager to get navigation result
2. Apply result using helper method
3. No more updating 3-4 different places manually
- Applied same pattern as next_row
- Reduced from 29 lines to 11 lines
- Uses apply_row_navigation_result helper to consolidate state updates
- Both up/down navigation now follow the same clean pattern

Ready to apply this pattern to remaining 11 navigation methods
- Added apply_column_navigation_result() helper
- Simplified move_column_left from 51 to 13 lines (74% reduction)
- Simplified move_column_right from 62 to 13 lines (79% reduction)
- Follows same pattern as row navigation helpers

Column navigation now uses single helper for state updates instead of
duplicating the same updates in every method. Ready for testing before
applying to remaining navigation methods.
@TimelordUK TimelordUK merged commit bae64c0 into main Aug 22, 2025
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