Make exported stroke thickness match the preview

Strokes were sized in view points but exported in image pixels, so on
retina captures the saved/copied annotation looked several times thinner.
Stroke widths are now converted into image pixels when drawn and scaled
back for the preview, keeping preview and export identical.

💘 Generated with Crush

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

Sources/Kapture/ResultWindow.swift

@@ -195,14 +195,15 @@ final class CaptureModel: ObservableObject {
         return rep.cgImage ?? image
     }
 
-    func addStroke(_ points: [CGPoint]) {
+    /// `widthPx` is the stroke thickness in IMAGE PIXELS (the preview
+    /// converts the slider value so exports match what was drawn).
+    func addStroke(_ points: [CGPoint], widthPx: CGFloat) {
         guard points.count > 1 else { return }
         if tool == .redact {
-            // Redaction: a filled black bar from start to end, as thick as the
-            // current stroke width (drawn as a rect for clean edges).
-            strokes.append(Stroke(points: points, width: max(strokeWidth, 12), color: .black, isRedaction: true))
+            // Redaction: a filled black bar from start to end.
+            strokes.append(Stroke(points: points, width: max(widthPx, 12), color: .black, isRedaction: true))
         } else {
-            strokes.append(Stroke(points: points, width: strokeWidth, color: drawColor))
+            strokes.append(Stroke(points: points, width: widthPx, color: drawColor))
         }
         redoStack = []
     }
@@ -575,7 +576,8 @@ struct ScreenshotPane: View {
                             for point in stroke.points.dropFirst() {
                                 path.addLine(to: CGPoint(x: origin.x + point.x * scale, y: origin.y + point.y * scale))
                             }
-                            context.stroke(path, with: .color(Color(nsColor: stroke.color)), lineWidth: stroke.width)
+                            // stroke.width is in image pixels; scale to view points
+                            context.stroke(path, with: .color(Color(nsColor: stroke.color)), lineWidth: stroke.width * scale)
                         }
                     }
                 }
@@ -636,7 +638,7 @@ struct ScreenshotPane: View {
                     .onEnded { _ in
                         if model.tool != .select {
                             if currentStroke.count > 1 {
-                                model.addStroke(currentStroke)
+                                model.addStroke(currentStroke, widthPx: model.strokeWidth / max(scale, 0.01))
                             }
                             currentStroke = []
                         } else {

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.9.1</string>
+    <string>1.9.2</string>
     <key>CFBundleVersion</key>
-    <string>91</string>
+    <string>92</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>