Waveform visualisation in Now Playing bar

[zeevenn]

Parent

#39 — PRD: AI Radio — Host-driven Channel experience with chat timeline

What to build

Replace the [~~~] placeholder in the Now Playing bar with a live audio waveform or playback visualisation. The goal is to give immediate visual feedback that audio is playing.

Options to evaluate (pick one):

• A animated waveform using expo-av audio metering data (amplitude bars)
• A dedicated RN waveform package (e.g. react-native-audio-waveform or similar)
• A simpler equaliser-style animation driven by PlaybackStore.position as a proxy for activity

The visualisation must:

• Animate while a Segment is playing (Track or Interlude)
• Be static / idle when paused
• Not require changes to the Player or Programme model — UI-only concern

Acceptance criteria

• Now Playing bar shows an animated waveform or visualiser while audio is playing
• Visualisation pauses when playback is paused
• Works for both TrackSegments and InterlSegments
• No regressions to playback performance

Blocked by

• Radio Screen shell + Chat Timeline Store #44 (Radio Screen shell — Now Playing bar placeholder)