Fix multiline string interpolation compile error in ContentView

String interpolation cannot span multiple lines in Swift. Removed the
unnecessary "\(...)" wrapper since Exporter.toText/toJSON already return String.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: superhighfives

Pika/Views/ContentView.swift

@@ -69,16 +69,16 @@ struct ContentView: View {
         }
         .onReceive(NotificationCenter.default.publisher(for: .triggerCopyText)) { _ in
             pasteboard.clearContents()
-            let contents = "\(Exporter.toText(
+            let contents = Exporter.toText(
                 foreground: eyedroppers.foreground, background: eyedroppers.background,
-                style: copyFormat))"
+                style: copyFormat)
             pasteboard.setString(contents, forType: .string)
         }
         .onReceive(NotificationCenter.default.publisher(for: .triggerCopyData)) { _ in
             pasteboard.clearContents()
-            let contents = "\(Exporter.toJSON(
+            let contents = Exporter.toJSON(
                 foreground: eyedroppers.foreground, background: eyedroppers.background,
-                style: copyFormat))"
+                style: copyFormat)
             pasteboard.setString(contents, forType: .string)
         }
     }