Windows Terminal lacks Kitty keyboard protocol, so Alt+Shift+P is emitted
as the legacy two-byte sequence ESC + 'P'. The native key parser only
handled lowercase ESC pairs (alt+letter), so matchesKey("\x1bP",
"alt+shift+p") and parseKey("\x1bP") both failed, breaking the
app.plan.toggle keybinding (and every other Alt+Shift+letter shortcut)
on Windows.
Add ALT_SHIFT_LETTERS table and route ESC+A..Z through it in both
parse_esc_pair (parsing) and matches_key_inner (matching) when Kitty
protocol is inactive.
Fixes#879
can1357
9caf025937