fix: resolve TypeScript type errors

Fixed several TypeScript issues:
- Changed 'formatter' to 'formatValue' in CircularKnob props
- Added explicit type annotations for formatValue functions
- Initialized animationFrameRef with undefined value
- Removed unused Waveform import from TrackControls

All type checks now pass.

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

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

components/analysis/Spectrogram.tsx

@@ -10,7 +10,7 @@ export interface SpectrogramProps {
 
 export function Spectrogram({ analyserNode, className }: SpectrogramProps) {
   const canvasRef = React.useRef<HTMLCanvasElement>(null);
-  const animationFrameRef = React.useRef<number>();
+  const animationFrameRef = React.useRef<number | undefined>(undefined);
   const spectrogramDataRef = React.useRef<ImageData | null>(null);
 
   React.useEffect(() => {