Allow upside-down portrait mode (reverse portrait) for video playback

[TransZAllen]

Checklist

• I made sure that there are no existing issues - open or closed - which I could contribute my information to.
• I have read the FAQ and my problem isn't listed.
• I'm aware that this is a request for NewPipe itself and that requests for adding a new service need to be made at NewPipeExtractor.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Description:

Hi! I’ve noticed a small usability improvement idea while watching vertical videos on my phone — especially when charging.
When watching vertical videos, I often place my phone upright on a surface (bottom edge on the table) while charging.
However, since the charging port is at the bottom, the cable prevents the phone from standing properly → can't stand flat.

Here’s an example YouTube video showing this behavior:
🔗 https://www.youtube.com/watch?v=CehUpX-B4BQ
(This is a portrait-oriented video — intended for vertical viewing.)

When I flip my phone upside down:

• Sometimes the video switches to landscape mode — not ideal for vertical content.
• Sometimes the video stays in portrait mode, but the entire screen (including the UI) appears upside down — making it unwatchable.

If NewPipe supported upside-down portrait orientation, I could simply flip my phone and continue watching comfortably while charging.

Some apps like Tor VPN Beta (Play Store link) allow this — the entire interface (including the system status bar: time, battery, and signal icons) rotates 180°, following the device orientation.

Benefits:

• Better usability while charging
• No negative effect for users who don’t use this orientation

Why do you want this feature?

Better watching experience for vertical videos while charging.