fix: tracker context menu logic and server name

contextmenu.py: Harden context-menu handlers by validating row bounds against state.posts, avoid relying on selectedItems() in places where _context_menu_row is used, and handle directory paths when deleting downloads (os.path.isdir or isfile) before send2trash. Also streamline URL opening with exception handling. main.py: Update SERVER_NAME to "SoftwareManager_KeksPirates". These changes prevent out-of-range/selection errors and ensure directories are trashed safely; also update server identification.

src/main.py

@@ -25,7 +25,7 @@ import signal
 import time
 import sys
 
-SERVER_NAME = "SoftwareManager_python"
+SERVER_NAME = "SoftwareManager_KeksPirates"
 
 class SingleInstance(QObject):
     def __init__(self):