Support for ed25519 key for SFTP/SSH (`Unsupported Algorithm [1.3.101.112]`)

I wanted to add a SFTP server with key-based auth but it crashes with the stack trace below when pressing "Add" or "Save" on the add/edit SFTP dialog.

The cause appears to be that my key is using ed25519 algorithm which appears to be unsupported. The key was generated in ConnectBot.

I am using version 1.7.4 (39) from F-Droid on Android 13. I noticed that the last release was almost a year ago, but I haven't tested whenever it is fixed or not in the current development version.

java.lang.IllegalArgumentException: Unsupported Algorithm [1.3.101.112]
	at R6.b.l(SourceFile:71)
	at e6.d.c(SourceFile:91)
	at me.zhanghai.android.files.storage.EditSftpServerFragment.k0(SourceFile:338)
	at q5.o.onClick(SourceFile:96)
	at android.view.View.performClick(View.java:7516)
	at com.google.android.material.button.MaterialButton.performClick(SourceFile:10)
	at android.view.View.performClickInternal(View.java:7490)
	at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
	at android.view.View$PerformClick.run(View.java:29349)
	at android.os.Handler.handleCallback(Handler.java:942)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loopOnce(Looper.java:346)
	at android.os.Looper.loop(Looper.java:475)
	at android.app.ActivityThread.main(ActivityThread.java:7950)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:942)

Start at EditSftpServerFragment.k0 in the stack trace and compare the reported 1.7.4 behavior with the current development version. Reproduce saving an SFTP server configured with a ConnectBot-generated ed25519 key; done means the dialog no longer crashes and key-based authentication is supported.