frontend: move accent-role blue/sky to Iris (popup links, play glyph, admin info banners)

Category colours (police tag, trips) stay as-is: they're semantic, not accent.

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

drb-frontend/components/MapView.tsx

@@ -1351,7 +1351,7 @@ function FanIncidentLayer({
                       <a
                         href={`/incidents/${inc.incident_id}`}
                         onClick={(e) => { e.stopPropagation(); window.location.href = `/incidents/${inc.incident_id}`; e.preventDefault(); }}
-                        className="text-xs text-blue-600 hover:underline block mt-0.5"
+                        className="text-xs text-indigo-600 hover:underline block mt-0.5"
                       >
                         View incident →
                       </a>
@@ -1505,7 +1505,7 @@ function IncidentPathLayer({
                           <span className="text-xs text-ink-muted">Play this call</span>
                         </div>
                       )}
-                      <a href={`/incidents/${inc.incident_id}`} className="text-xs text-blue-600 hover:underline block mt-1">
+                      <a href={`/incidents/${inc.incident_id}`} className="text-xs text-indigo-600 hover:underline block mt-1">
                         View incident →
                       </a>
                       {/* Gate A / A2 (server-26#46) — the stop location and its