feat(live): add team radio ticker

Subscribe to TeamRadio on the F1 live feed, parse defensive capture snapshots and patches, and relay capped captures through live snapshots with the SessionInfo static path. Add the frontend CDN URL helper and ticker using one shared audio element.

frontend/src/components/live/TeamRadioTicker.tsx

@@ -0,0 +1,108 @@
+import { useMemo, useRef, useState } from 'react'
+import { Pause, Play } from 'lucide-react'
+import type { LiveDriverInfo, LiveRadioCapture, LiveSessionMeta } from '../../types'
+import { radioCaptureKey, radioClipUrl } from '../../lib/radio'
+import { teamColor } from '../../utils'
+import '../../styles/team-radio.css'
+
+interface Props {
+  captures?: LiveRadioCapture[]
+  driverInfo?: Record<string, LiveDriverInfo>
+  session?: LiveSessionMeta
+}
+
+function relativeTime(utc: string): string {
+  const timestamp = new Date(utc).getTime()
+  if (!utc || Number.isNaN(timestamp)) return '--'
+
+  const diffSeconds = Math.max(0, Math.floor((Date.now() - timestamp) / 1000))
+  if (diffSeconds < 60) return `${diffSeconds}s ago`
+  const minutes = Math.floor(diffSeconds / 60)
+  if (minutes < 60) return `${minutes}m ago`
+  const hours = Math.floor(minutes / 60)
+  if (hours < 24) return `${hours}h ago`
+  return new Date(utc).toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })
+}
+
+function driverLabel(info: LiveDriverInfo | undefined, racingNumber: string): string {
+  return info?.Tla || racingNumber
+}
+
+export function TeamRadioTicker({ captures = [], driverInfo = {}, session }: Props) {
+  const audioRef = useRef<HTMLAudioElement | null>(null)
+  const [playingKey, setPlayingKey] = useState<string | null>(null)
+
+  const newestFirst = useMemo(() => [...captures].reverse(), [captures])
+
+  const toggleCapture = (capture: LiveRadioCapture) => {
+    const key = radioCaptureKey(capture)
+    const audio = audioRef.current
+    const url = radioClipUrl(session, capture)
+    if (!audio || !url) return
+
+    if (playingKey === key) {
+      audio.pause()
+      setPlayingKey(null)
+      return
+    }
+
+    audio.pause()
+    audio.src = url
+    setPlayingKey(key)
+    const play = audio.play()
+    if (play) {
+      play.catch(() => setPlayingKey(null))
+    }
+  }
+
+  return (
+    <section className="team-radio panel-glass" data-testid="team-radio-ticker">
+      <div className="sec-header sticky-header">
+        <span className="sec-title">Team Radio</span>
+        {captures.length > 0 && <span className="sec-meta">{captures.length} clips</span>}
+      </div>
+
+      <audio
+        ref={audioRef}
+        className="team-radio-audio"
+        onEnded={() => setPlayingKey(null)}
+      />
+
+      {newestFirst.length === 0 ? (
+        <div className="missing-notice">No team radio clips in the current live snapshot.</div>
+      ) : (
+        <div className="team-radio-list">
+          {newestFirst.map((capture) => {
+            const key = radioCaptureKey(capture)
+            const info = driverInfo[capture.RacingNumber]
+            const label = driverLabel(info, capture.RacingNumber)
+            const isPlaying = playingKey === key
+            const url = radioClipUrl(session, capture)
+
+            return (
+              <div className="team-radio-row" key={key}>
+                <button
+                  className="team-radio-play"
+                  type="button"
+                  aria-label={`${isPlaying ? 'Pause' : 'Play'} ${label} radio`}
+                  disabled={!url}
+                  onClick={() => toggleCapture(capture)}
+                >
+                  {isPlaying ? <Pause size={14} /> : <Play size={14} />}
+                </button>
+                <span
+                  className="team-radio-driver"
+                  style={{ borderColor: teamColor(info?.TeamColour) }}
+                  title={info?.TeamName || undefined}
+                >
+                  {label}
+                </span>
+                <span className="team-radio-time">{relativeTime(capture.Utc)}</span>
+              </div>
+            )
+          })}
+        </div>
+      )}
+    </section>
+  )
+}