v4.3.0

The map comes alive: real-time packet animation, a live traceroute tracer, and
per-node/cluster liveness — all driven by the existing SSE stream.

Highlights

Live packet arcs. Each received packet animates a comet from the
transmitter to the gateway(s) that actually heard it — real from → sender
RF paths, colored by packet type and weighted by signal strength. On by
default; toggle in Settings → Animations.
Live traceroute tracer. Traceroutes replay as a comet hopping node-to-node
along the real discovered route.

Packet-arc animation layer driven by the live /v1/events stream:
per-transmission fan-in (deduped across gateways), packet-type color key, and
cluster-aware endpoints (arcs snap to the cluster a node is in).
Traceroute multi-hop path animation, including a new traceroute SSE event
from the backend.
Node activity sparkline in the node details panel (last 15 minutes; seeded
from packet history, then live).
Settings → Animations: master on/off for all live map motion (default on).

Map legend refreshed: live-packet type colors, node recency, and traceroute
entries; redundant entries removed.

Single self-stopping WebGL animation layer.
Vsync-aligned (requestAnimationFrame) pacing and batched GPU uploads to
eliminate comet stutter on busy meshes; 30fps cap keeps the UI responsive.
Comet travel is constant on-screen speed regardless of zoom or distance.
Cluster donuts re-drape terrain only on camera movement.
Honors prefers-reduced-motion.