Add live output option to preferences

[xxfttkx]

Problem / Motivation
Currently, the live output logic is implemented directly inside ProcessOutputDialog.

• Users cannot configure whether to enable live output globally.
• The code for live output is tightly coupled with the dialog UI, making it harder to reuse elsewhere.

Proposed Solution

• Move the live output logic into a central preference / settings object.
• Add a toggle in preferences for enabling/disabling live output by default.
• Keep the Switch in ProcessOutputDialog as a UI reflection of the preference.

Benefits

• Users can configure live output globally.
• Cleaner separation of concerns: UI vs logic.
• Easier to reuse live output in other parts of the app.

Additional Notes / Considerations

• Ensure backward compatibility: existing dialogs should respect current behavior if no preference is set.
• The preference can be implemented as a bool in SettingsViewModel or a similar central place.