Replace the static filled circle with a red triangle arrow that
rotates to match the character's current facing direction.
Uses the same render-space yaw convention as the 3D scene so
the arrow matches in-world orientation.
When the server has not sent SMSG_INIT_WORLD_STATES or the mask is
empty, fall back to locally-accumulated explored zones tracked by
player position. The local set is cleared when a real server mask
arrives so it doesn't persist stale data.
- Rider character bobs with mount's run animation (sinusoidal, 0.12u amplitude)
- Mount hoofbeat footstep sounds triggered at 4 points per animation cycle
- M key opens map directly to player's current zone instead of continent
- Mouse wheel scroll zooms map in/out between world, continent, and zone views
- Fog of war darkens unexplored zones on continent view, clears on visit
