v0.0.18: proper line editing in TUI input

Keyboard shortcuts:
- Left/Right: move cursor
- Home / Ctrl+A: beginning of line
- End / Ctrl+E: end of line
- Alt+Left/Right: word jump
- Alt+Backspace: delete word back
- Ctrl+W: delete word back
- Ctrl+U: clear entire line
- Ctrl+K: kill to end of line
- Delete: delete char at cursor
- Backspace: delete char before cursor

Cursor position tracked, chars insert at cursor (not just append).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.17"
+version = "0.0.18"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"