Add session event logging to capture flow for remote debugging

OverlayView now logs window tracking counts, hover changes, and
mouseDown/Up branch decisions into a session log that Copy Diagnostics
includes along with the app version, so capture failures on machines we
cannot access directly can be diagnosed from a pasted report.

💘 Generated with Crush

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

build-app.sh

@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.6.0</string>
+    <string>1.6.1</string>
     <key>CFBundleVersion</key>
-    <string>60</string>
+    <string>61</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>