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Addresses #16584 Problem: TUI word-wise cursor movement treated entire CJK runs as a single word, so Option/Alt+Left and Right skipped too far when editing East Asian text. Solution: Use Unicode word-boundary segments within each non-whitespace run so CJK text advances one segment at a time while preserving separator and delete-word behavior, and add regression coverage for CJK and mixed-script navigation. Testing: Manually tested solution by pasting text that includes CJK characters into the composer and confirmed that keyboard navigation worked correctly (after confirming it didn't prior to the change).