v1.4.2: Minimap viewport tracking and click-to-navigate verified

Minimap correctly tracks zoom/scroll with viewport rectangle overlay.
Click-to-navigate pans the main canvas. No code changes needed —
existing implementation works correctly.

Author: achrafsoltani

src/utils/constants.py

@@ -1,7 +1,7 @@
 # Application constants
 
 APP_NAME = "Merisio"
-APP_VERSION = "1.4.1"
+APP_VERSION = "1.4.2"
 FILE_EXTENSION = ".merisio"
 FILE_FILTER = "Merisio Projects (*.merisio);;All Files (*)"
 MSD_FILE_EXTENSION = ".msd"