feat: add copy/paste automation data functionality

Implemented automation clipboard system:
- Added separate automationClipboard state for automation points
- Created handleCopyAutomation function to copy automation lane points
- Created handlePasteAutomation function to paste at current time with time offset
- Added Copy and Clipboard icon buttons to AutomationHeader component
- Automation points preserve curve type and value when copied/pasted
- Points are sorted by time after pasting
- Toast notifications for user feedback
- Ready for integration when automation lanes are actively used

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

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

components/editor/AudioEditor.tsx

@@ -77,6 +77,7 @@ export function AudioEditor() {
   const [isMasterMuted, setIsMasterMuted] = React.useState(false);
   const [masterControlsCollapsed, setMasterControlsCollapsed] = React.useState(false);
   const [clipboard, setClipboard] = React.useState<AudioBuffer | null>(null);
+  const [automationClipboard, setAutomationClipboard] = React.useState<{ points: Array<{ time: number; value: number; curve: string }> } | null>(null);
   const [recordingTrackId, setRecordingTrackId] = React.useState<string | null>(null);
   const [punchInEnabled, setPunchInEnabled] = React.useState(false);
   const [punchInTime, setPunchInTime] = React.useState(0);
@@ -863,6 +864,90 @@ export function AudioEditor() {
     });
   }, [selectedTrackId, tracks, currentTime, addTrackFromBuffer, removeTrack, addToast]);
 
+  const handleCopyAutomation = React.useCallback((trackId: string, laneId: string) => {
+    const track = tracks.find((t) => t.id === trackId);
+    if (!track) return;
+
+    const lane = track.automation.lanes.find((l) => l.id === laneId);
+    if (!lane || lane.points.length === 0) {
+      addToast({
+        title: 'No Automation Data',
+        description: 'Selected automation lane has no points',
+        variant: 'error',
+        duration: 2000,
+      });
+      return;
+    }
+
+    // Copy the automation points
+    setAutomationClipboard({
+      points: lane.points.map(p => ({
+        time: p.time,
+        value: p.value,
+        curve: p.curve,
+      })),
+    });
+
+    addToast({
+      title: 'Automation Copied',
+      description: `Copied ${lane.points.length} automation point(s)`,
+      variant: 'success',
+      duration: 2000,
+    });
+  }, [tracks, addToast]);
+
+  const handlePasteAutomation = React.useCallback((trackId: string, laneId: string) => {
+    if (!automationClipboard) {
+      addToast({
+        title: 'Nothing to Paste',
+        description: 'No automation data in clipboard',
+        variant: 'error',
+        duration: 2000,
+      });
+      return;
+    }
+
+    const track = tracks.find((t) => t.id === trackId);
+    if (!track) return;
+
+    const lane = track.automation.lanes.find((l) => l.id === laneId);
+    if (!lane) return;
+
+    // Generate new IDs for pasted points and shift them to current time
+    const timeOffset = currentTime;
+    const newPoints = automationClipboard.points.map((p) => ({
+      id: `point-${Date.now()}-${Math.random()}`,
+      time: p.time + timeOffset,
+      value: p.value,
+      curve: p.curve as 'linear' | 'bezier' | 'step',
+    }));
+
+    // Merge with existing points and sort by time
+    const updatedLanes = track.automation.lanes.map((l) => {
+      if (l.id === laneId) {
+        return {
+          ...l,
+          points: [...l.points, ...newPoints].sort((a, b) => a.time - b.time),
+        };
+      }
+      return l;
+    });
+
+    updateTrack(trackId, {
+      automation: {
+        ...track.automation,
+        lanes: updatedLanes,
+      },
+    });
+
+    addToast({
+      title: 'Automation Pasted',
+      description: `Pasted ${newPoints.length} automation point(s) at ${formatDuration(currentTime)}`,
+      variant: 'success',
+      duration: 2000,
+    });
+  }, [automationClipboard, tracks, currentTime, updateTrack, addToast]);
+
   // Export handler
   const handleExport = React.useCallback(async (settings: ExportSettings) => {
     if (tracks.length === 0) {