Addresses "the floating Sasquatch flashing is annoying":
- Pulse is now state-driven: the animate-ping halo shows only when there's an
unread tip (message), never perpetually; the unread dot matches.
- Honors prefers-reduced-motion (motion-reduce:hidden).
- Map-aware: Layout passes isFullBleed, so on the map the bubble runs compact
(smaller, no glow, no pulse) instead of competing with map controls.
- Hideable: a ✕ on the FAB hides it (useSasquatchHidden, localStorage
sasquatch-hidden, same-tab synced via an event), with a "Show Sasquatch
assistant" toggle in Settings → Appearance to bring it back.
