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* Add platform-correct Command Backspace - Add semantic line-start deletion across Zig and TypeScript text mirrors. - Preserve platform keymaps, controlled state, undo, and replay behavior. - Cover all editable widgets and document the shortcut. Co-authored-by: Mohak Bajaj <77928693+MohakBajaj@users.noreply.github.com> * Fix Command Backspace edge cases * Fix platform-specific Command Backspace test --------- Co-authored-by: Mohak Bajaj <77928693+MohakBajaj@users.noreply.github.com>