v0.31.6

• Fixed: every modifier key press (Shift / Cmd / Option) triggered an internal AppKit exception — invisible in normal use, but undefined behavior that could corrupt a long-lived session, and the prime suspect for rare "app suddenly quits" crashes.
• New: crash black box — if kooky ever dies unexpectedly, its last words are saved to ~/Library/Logs/kooky/stderr.log so the cause can be diagnosed instead of lost.