Opt-out Option for Automatic Clipboard Capture

Current Behavior:
Pastai automatically captures and adds all new data copied to the clipboard from other applications while the software is running.

Proposed Feature:
Implement an opt-out option to disable the automatic clipboard capture functionality.

Rationale:
The current automatic capture behaviour can be disruptive and annoying for users who prefer more control over what gets added to the pasta.

Implementation Suggestions:

1. Add a toggle switch in the pastai settings menu labelled "Automatic Clipboard Capture"

2. When disabled, pastai should not automatically add new clipboard content

3. Consider adding a keyboard shortcut or context menu option to manually add clipboard content when auto-capture is disabled

User Interface:

• Include the new option in the settings menu

• Provide a clear explanation of the feature's functionality

• Consider adding a first-time user prompt to explain the new feature