fix(tv): restore the native Android IME for single-line text input

Android TV returns to the platform keyboard for single-line fields; the
Flutter overlay stays for multiline and explicit call sites. The bugs
that forced the overlay (#1051, #1079) were an engine show/bind ordering
race, now repaired at the app level:

- MainActivity retries a soft-input show the engine dropped while the
  FlutterView was not yet served (flutter/flutter#177360), rebinds the
  IME key session once at first show, and consumes leaked D-pad keys
  while the keyboard is visible (bounded restartInput budget) so focus
  cannot wander behind a stuck keyboard.
- The platform text-input hint is activation-based, so gamepad pause and
  the pre-IME D-pad intercept track a live session instead of mere field
  focus.
- While a session is live with the keyboard away, Back closes it and is
  consumed once, Select re-raises the keyboard, and arrows keep
  caret-aware edge-escape navigation instead of dead-ending.

lib/screens/settings/add_jellyfin_screen.dart

@@ -499,9 +499,10 @@ class _AddJellyfinScreenState extends State<AddJellyfinScreen> with AsyncFormSta
       FocusableTextFormField(
         controller: _urlController,
         focusNode: _urlFocus,
-        tvTextInputPresentation: PlatformDetector.isAppleTV()
-            ? TvTextInputPresentation.platform
-            : TvTextInputPresentation.automatic,
+        // Native on every TV: `automatic` would route this wrap-to-4-lines
+        // field to the Flutter overlay, but it is logically single-line URL
+        // input and the platform IME handles it (#1051, #1079).
+        tvTextInputPresentation: TvTextInputPresentation.platform,
         autofocus: true,
         tvTextInputAutoOpenBehavior: deferredUrlFieldAutoOpen,
         keyboardType: TextInputType.url,