[Feat]: Keep Screen On to enable longer/slower generations

[Duxon]

Problem:
Often, the screen turns off during long-running generative processes, interrupting the generation and potentially losing valuable results. This is particularly frustrating when generating large text responses.

Solution:
Implement a feature that keeps the screen on while a generative process is active. This could be a toggle in the app's settings.

Use Case:

• Long text generation: When writing long articles, essays, or creative writing, the screen turning off can disrupt the flow and lead to lost ideas.
• Code generation: Writing complex code or running long-running scripts can benefit from a persistent screen to avoid interruptions and easily view output.
  Additional Considerations:
• Battery: This feature may impact battery life. Consider providing an option to turn off the feature after a certain period of inactivity.
• Wake lock: Use the Android WakeLock API to prevent the screen from turning off.