Fix vertical offset when capturing the secondary display

The first ScreenCaptureKit Y-flip used the wrong reference edges, shifting
cropped selections on displays below the main screen. Convert each selection
per-display as scY = appKitY - NSScreen.maxY + SCDisplay.maxY, which
matches both the main and secondary displays.

💘 Generated with Crush

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

Sources/Kapture/CaptureController.swift

@@ -180,12 +180,12 @@ final class ScreenCapture {
                 config.height = Int(CGFloat(display.height) * backingScale)
                 config.showsCursor = true
 
-                // ScreenCaptureKit's Y axis is flipped relative to AppKit
+                // ScreenCaptureKit uses a different origin than AppKit for
-                // NSScreen frames. Convert the selection into SCDisplay space
+                // screens stacked around the main display: per-display,
-                // using the matching NSScreen's top edge, then crop there.
+                // SCDisplay y = appKitY - NSScreen.maxY + SCDisplay.maxY.
                 let scRect = CGRect(
                     x: rect.minX,
-                    y: screen.frame.maxY - rect.maxY + display.frame.minY,
+                    y: rect.minY - screen.frame.maxY + display.frame.maxY,
                     width: rect.width,
                     height: rect.height
                 )

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.1.7</string>
+    <string>1.1.8</string>
     <key>CFBundleVersion</key>
-    <string>17</string>
+    <string>18</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>