Add frozen-screen capture on Ctrl+Shift+Cmd+S

A second hotkey snapshots every display the moment it is pressed and
shows that still image as the overlay, so the pointer and hover states
(tooltips, open menus) are captured. Selection is marquee-only — no
window detection — and the result is cropped from the snapshot rather
than recaptured, keeping the frame exactly as it was.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4-flash-0731

Sources/Kapture/App.swift

@@ -33,6 +33,7 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
             }
         }
         HotkeyManager.shared.onTrigger = { CaptureController.shared.begin() }
+        HotkeyManager.shared.onFrozenTrigger = { CaptureController.shared.begin(frozen: true) }
         HotkeyManager.shared.register()
     }
 }
@@ -44,6 +45,9 @@ struct MenuView: View {
         Button("Capture & OCR") { CaptureController.shared.begin() }
             .keyboardShortcut("s", modifiers: [.command, .shift])
 
+        Button("Capture Frozen Screen") { CaptureController.shared.begin(frozen: true) }
+            .keyboardShortcut("s", modifiers: [.command, .shift, .control])
+
         Button("Extract from Image File…") { ResultWindow.shared.showOpenPanel() }
 
         Divider()