fix(tvos): open the sign-in keyboard after fast server probes instead of freezing remote input

Adding an Emby server on Apple TV locked the app up after entering the
URL: the server probe answered inside the URL keyboard's dismissal
animation, so the username field's system keyboard silently never
presented while its editing session kept ownership of every remote
press — leaving only Menu, which suspends the app. Jellyfin was
unaffected in practice because Quick Connect skips the username focus.

Engine 3.44.0+6 defers first-responder takes until the in-flight
keyboard presentation clears and routes remote presses to the engine
whenever no keyboard is actually on screen, so the session can no
longer strand the user.

close #2011

tvos/engine.sha256

@@ -1 +1 @@
-21dcdb1b8e369e8385cd41b7844e7248923680a22f4ea303a976494724a0829d
+c9d14e12e35d15b0dc958662e51153291292ea24b08c9bd34825199929ae6041

tvos/engine.version

@@ -1 +1 @@
-3.44.0+5
+3.44.0+6