Enhance UI/UX for Upload Notifications

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### Current behavior (Single-file control, queue continues)

Upload notification is designed around single-file control, while the `Upload List` screen can be used for managing all uploads. This is intentional, but it’s worth walking through the different UX paths and why some are better suited for certain surfaces than others.

- Each upload has its own notification.
- User can pause or cancel that specific file.
- If one upload is paused or canceled, the remaining files continue uploading.
- For more complex actions (resume, remove all, pause all), the user goes to the Upload List screen.

### Use case: Pause or cancel all uploads from notification

- User suddenly has very slow or unstable internet.
- User wants to stop everything immediately with one tap.

**Possible solution:**

Add a “Pause all” / “Cancel all” button to the notification.

### Use case: Pausing many individual uploads

- User uploads 50 files.
- User pauses 10 specific uploads.

And user wants to have 10 paused upload notifications so that they can resume from notification not Upload list screen and one ongoing upload notification.

In my opinion notifications are meant for fast, low-decision actions. Adding button for all scenarious would be not good.

Lets discuss UI/UX for these use cases. @kra-mo @ZetaTom @tobiasKaminsky