Implemented key tables to create clean, organized namespaces for tab and pane management. This refactoring improves keybinding discoverability and reduces cognitive load by grouping related operations. Key changes: - LEADER + t enters tab mode (n/q/r for new/quit/rename) - LEADER + p enters pane mode (s/v/q/m for split/vsplit/quit/maximize) - LEADER + Escape enters copy mode (vim-like pseudo-normal mode) - CTRL + SHIFT + v for paste (standard terminal convention) - Removed smart-splits plugin in favor of simpler native navigation - Navigation keys remain at top level for quick access  | 
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