enhance fullscreen mode feature

[cristal-node]

功能描述 / Feature description

the viewer does not exit fullscreen when controllers pop up, as a result it is hard to use android navigation bar and gestures.

the viewer should exit fullscreen at the same time when the controllers pop up while reading. and also enter fullscreen mode again when the controllers disappear.

tachiyomi and other manga reader app have this behavior.

备注 / Additional details

i'm using android 11. i cant read chinese, so couldn't find any similar issue.

自查步骤 / Self-review steps

• 如果您有足够的时间和能力，并愿意为此功能请求提交 PR ，请勾上此复选框 / Pull request is welcome. Check this if you want to start a pull request
• 您已搜索过 Issue Tracker，没有找到类似的请求 / I have searched on Issue Tracker, No duplicate or related open issue has been found
• 您确保这个 Issue 只发起一个功能请求。如果您有多个功能请求，烦请发起多个 Issue / Ensure there is only one feature request in this issue. Please make mutiply issue for mutiply feature request