Function parseKeySequence

parseKeySequence(input: string): ParseKeyResult
Parse a keybinding string into a KeySequence.

Supports:
- Single keys: "a", "escape", "f1"
- With modifiers: "ctrl+s", "shift+a", "ctrl+shift+z"
- Chord sequences (space-separated): "g g", "ctrl+k ctrl+c"
Modifier names (case-insensitive):
- shift
- ctrl, control
- alt
- meta, cmd, command, win, super
Key names (case-insensitive):
- Single letters: a-z
- Digits: 0-9
- Named keys: escape, enter, tab, backspace, space, etc.
- Function keys: f1-f12
- Navigation: up, down, left, right, home, end, pageup, pagedown
- Editing: insert, delete
Parameters
- input: string
  Keybinding string to parse
Returns ParseKeyResult
ParseKeyResult with KeySequence or error
Example
```
parseKeySequence("ctrl+s")      // Single key with modifier
parseKeySequence("g g")         // Two-key chord
parseKeySequence("ctrl+k ctrl+c") // Chord with modifiers
```
- Defined in core/src/keybindings/parser.ts:177