The full screen collapses to a small bar too easily

### Description

When using pocketCasts to version 7.84. In Android 15 on my pixel 7 but on other phones as well the full screen collapses to a small bar too easily with one minor mistaken press
I suggest a lock icon that will allow us to maintain a full screen unless it's released
Thanks for listening

### Step-by-step reproduction instructions

Opening a full screen play, start listening then press anywhere almost and it collapses to a little bar at the bottom

### Screenshots or screen recording

_No response_

### Did you search for existing bug reports?

- [x] I have searched for existing bug reports.

### Device, Operating system, and Pocket Casts app version

_No response_

Start by reproducing the collapse behavior in the full-screen player on Android 15, following the steps in the issue. Trace the full-screen player entry point and its press handling; done means a lock control can keep the player expanded until the user releases it, without breaking normal collapse behavior.

Written by the indexing model from the issue text.