refactor: change pan icon to CircleArrowOutUpRight

Replaced Move icon with CircleArrowOutUpRight for better visual
representation of panning direction control.

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

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

components/tracks/Track.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import * as React from 'react';
-import { Volume2, VolumeX, Headphones, Trash2, ChevronDown, ChevronRight, Move } from 'lucide-react';
+import { Volume2, VolumeX, Headphones, Trash2, ChevronDown, ChevronRight, CircleArrowOutUpRight } from 'lucide-react';
 import type { Track as TrackType } from '@/types/track';
 import { Button } from '@/components/ui/Button';
 import { Slider } from '@/components/ui/Slider';
@@ -284,7 +284,7 @@ export function Track({
             {/* Pan */}
             <div className="flex items-center gap-2">
               <label className="text-xs text-muted-foreground flex items-center gap-1 w-16 flex-shrink-0">
-                <Move className="h-3 w-3" />
+                <CircleArrowOutUpRight className="h-3 w-3" />
                 Pan
               </label>
               <div className="flex-1">