Ports ZIG/src/input (except macOS keymaps) into ghostty-input:
- key, key_mods (incl. RemapSet), the physical keycode table
- key_encode: legacy, modifyOtherKeys and kitty keyboard protocol
encoders, function key tables
- Binding: all keybinding actions with their user-visible docs (for
+list-actions), triggers, sets with sequences, chains, leader keys and
key tables, and formatting back to config strings
- command palette defaults, mouse, paste safety checks, kitty helpers,
links, helpgen action docs
Deviations (docs/rewrite/notes/ghostty-input.md): Mods.super is named
super_; case folding uses char::to_lowercase plus Ghostty's special
cases instead of uucode tables; chain parents are trigger paths instead
of pointers; a Zig bug where chained leaves inside sequences corrupted the
shared prefix when formatting is fixed (covered by a test).
Integration left: building encode/paste Options from terminal modes,
and implementing the EntryFormatter trait in ghostty-config.
Test Plan:
- cargo test -p ghostty-input (220 tests; 8 macOS-only skipped)
- cargo clippy -p ghostty-input --all-targets -- -D warnings
