GUI tutorial

1. At startup, Cobotta loads the requested P range from the robot; other devices load the default JSON file.

2. Retrieve the robot's current position.

3. Teach the retrieved current position to a specified P number or a single selected table row; confirm overwrites.

4. Right-click a row to teach, clear, or remove. Ctrl/Command and Shift support multi-row selection for clearing/removal.

5. Clear assigns [0, 0, 0, 0, 0, 0, -1]. Remove from list only removes rows; it does not delete internal Cobotta P variables.

6. Use file dialogs to load/save arbitrary JSON files. Their initial path and filename come from JSON_FILE.

7. When closing with pending changes, choose to save, discard, or cancel. In Cobotta mode, the save operation also considers synchronization to the robot.

Warning: Cobotta writes are executed when the teaching action is performed. Discarding changes on exit does not roll back completed robot writes. Shutdown may wait for an active communication operation.