I lost my ability to select up and down in the session selector because
of some hardcoded keybindings again... So, I am adding these
configurable keybindings so I can `ctrl+p` to select up :-)
### Changes
Adds 4 new keybinding actions for the session picker (/resume):
- `toggleSessionPath` (ctrl+p) - toggle path display
- `toggleSessionSort` (ctrl+r) - toggle sort mode
- `deleteSession` (ctrl+d) - delete selected session
- `deleteSessionNoninvasive` (ctrl+backspace) - delete when query empty
Refactors session-selector to use `kb.matches()` instead of hardcoded key checks.
225fcb3830