feat: apply defaultTrackHeight and defaultZoom settings

- Modified createTrack and createTrackFromBuffer to accept height parameter
- Updated useMultiTrack to pass height when creating tracks
- Applied settings.ui.defaultTrackHeight when adding new tracks
- Applied settings.editor.defaultZoom for initial zoom state
- Removed duplicate useSettings hook declaration in AudioEditor
- New tracks now use configured default height from settings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/audio/track-utils.ts

@@ -17,7 +17,7 @@ export function generateTrackId(): string {
 /**
  * Create a new empty track
  */
-export function createTrack(name?: string, color?: TrackColor): Track {
+export function createTrack(name?: string, color?: TrackColor, height?: number): Track {
   const colors: TrackColor[] = ['blue', 'green', 'purple', 'orange', 'pink', 'indigo', 'yellow', 'red'];
   const randomColor = colors[Math.floor(Math.random() * colors.length)];
 
@@ -30,7 +30,7 @@ export function createTrack(name?: string, color?: TrackColor): Track {
     id: trackId,
     name: trackName,
     color: TRACK_COLORS[color || randomColor],
-    height: DEFAULT_TRACK_HEIGHT,
+    height: height ?? DEFAULT_TRACK_HEIGHT,
     audioBuffer: null,
     volume: 0.8,
     pan: 0,
@@ -70,11 +70,12 @@ export function createTrack(name?: string, color?: TrackColor): Track {
 export function createTrackFromBuffer(
   buffer: AudioBuffer,
   name?: string,
-  color?: TrackColor
+  color?: TrackColor,
+  height?: number
 ): Track {
   // Ensure name is a string before passing to createTrack
   const trackName = typeof name === 'string' && name.trim() ? name.trim() : undefined;
-  const track = createTrack(trackName, color);
+  const track = createTrack(trackName, color, height);
   track.audioBuffer = buffer;
   return track;
 }