Add split panes feature and fix alias matching
- Split Panes: Cmd+D (vertical) and Cmd+Shift+D (horizontal) - Close panes with Cmd+W when multiple panes exist - Fixed alias matching to work with command arguments - Aliases now match first word only (e.g., 'gs status' works with gs=git) Split panes allow multiple terminal sessions side-by-side in the same tab
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