Passenger/driver sit still in moving cars: seat pose sent relative to the vehicle (backward-compatible), no backward pull; remote cars/traffic extrapolate in physics time and interpolate; UI polish (shadows, borders, gradient buttons, server list hover, fill bars, colored ping)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

TrafficSync.cs

@@ -100,7 +100,7 @@ namespace MSCO
                 c.TargetPos = p;
                 c.TargetRot = q;
                 c.TargetVel = v;
-                c.TargetTime = Time.time;
+                c.TargetTime = Time.fixedTime; // Physik-Zeit wie in FixedUpdate (sonst negatives Alter = Rucken)
                 if (!c.Following)
                 {
                     c.WasKinematic = c.Rb.isKinematic;
@@ -117,7 +117,7 @@ namespace MSCO
             foreach (Car c in cars.Values)
             {
                 if (!c.Following || c.Rb == null) continue;
-                float ahead = Mathf.Min(Time.time - c.TargetTime, MaxExtrapolation);
+                float ahead = Mathf.Clamp(Time.fixedTime - c.TargetTime, 0f, MaxExtrapolation);
                 Vector3 goal = c.TargetPos + c.TargetVel * ahead;
                 float t = Mathf.Clamp01(Time.fixedDeltaTime * Smoothing);
                 if ((c.Rb.position - goal).sqrMagnitude > 25f) { c.Rb.position = goal; c.Rb.rotation = c.TargetRot; continue; }