Fix bare except clauses for better error handling

Replace 5 bare except clauses with 'except Exception:' to improve
error handling and prevent catching system exits and keyboard interrupts:

- gui.py:155 - Queue event processing
- setup_wizard.py:184 - API response parsing
- test_credentials.py:213 - Response JSON parsing
- test_credentials.py:240 - Error response parsing
- test_credentials.py:257 - Response text formatting

This change improves code quality and follows Python best practices
for exception handling.

gui.py

@@ -152,7 +152,7 @@ class Dashboard:
                 try:
                     msg = self.event_queue.get_nowait()
                     self.window["-LOG-"].print(msg)
-                except:
+                except Exception:
                     break
 
             # Update statistics