feat(jellyfin): From Jellyfin once signed in, the panel in the glow's colour, adding the words listed

Add material's entry is now From Jellyfin (Aus Jellyfin), with a play
icon rather than a TV, as it plays music too, and shows only once the
device is signed in to a server in Settings, as the assistant shows only
once switched on; Settings says where it then is. The screen it opens is
called Jellyfin, and its search finds music too.

The words' panel takes the glow's colour as the scene changes: each copy
the glow takes (every 3 s) gives its average, no lighter than 35 % so the
text stays readable, as strong as the glow and fading into the next as
it does. In the light theme, which has no glow, the panel is tinted from
it while the pointer is over it. What lights up in the panel takes a
scheme made from the same colour; the episode's thumbnail is no longer
used.

While the studyset holds none of the video's words, the study button
adds the words listed (Add 11 words, as the filter shows them), tagged
as a word added alone is; afterwards it studies them, and its menu adds
the new ones listed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/test/feature/jellyfin/watch_screen_test.dart

@@ -196,12 +196,21 @@ void main() {
     // 駅 and 友達 come twice; で, に, を, けど and だ are grammar.
     expect(words.take(2).toSet(), {'駅', '友達'});
     expect(words, isNot(contains('で')));
-    expect(words, contains('待つ'));
 
-    final wait = find.textContaining('待つ', findRichText: true).first;
-    await tester.ensureVisible(wait);
+    // Further down the list.
+    final wait = find.textContaining('待つ', findRichText: true);
+    await tester.scrollUntilVisible(
+      wait,
+      100,
+      scrollable: find
+          .descendant(
+            of: find.byType(CustomScrollView),
+            matching: find.byType(Scrollable),
+          )
+          .first,
+    );
     await tester.pumpAndSettle();
-    await tester.tap(wait);
+    await tester.tap(wait.first);
     await tester.pumpAndSettle();
     expect(players.last!.state.value.position, const Duration(seconds: 16));
     expect(find.text('A form of 待つ'), findsOneWidget);
@@ -602,6 +611,11 @@ void main() {
 
     await tester.tap(find.text('Study'));
     await tester.pumpAndSettle();
+    // The words listed it lacks can be added from here too.
+    expect(
+      find.textContaining(RegExp(r'^Add the \d+ new words listed$')),
+      findsOneWidget,
+    );
     await tester.tap(find.text('Cram, each once'));
     await tester.pump();
     await tester.pump(const Duration(seconds: 1));
@@ -627,6 +641,34 @@ void main() {
     );
   });
 
+  testWidgets("with none of the video's words held, the button adds the "
+      'words listed, tagged from Jellyfin, and then studies them', (
+    tester,
+  ) async {
+    await watch(tester);
+
+    final add = find.textContaining(RegExp(r'^Add \d+ words$'));
+    expect(add, findsOneWidget);
+    final listed = int.parse(
+      RegExp(r'\d+').firstMatch(tester.widget<Text>(add).data!)![0]!,
+    );
+    expect(listed, greaterThan(1));
+    await tester.tap(add);
+    await tester.pumpAndSettle();
+
+    expect(find.text('$listed words added'), findsOneWidget);
+    final added = await cards.cardsOf('japanese');
+    expect(added, hasLength(listed));
+    final tagging = await tags.read();
+    for (final card in added) {
+      expect(
+        [for (final tag in tagging.of(card.id)) tag.name],
+        containsAll(['Sample Journey', 'Sample Journey S1 E1']),
+      );
+    }
+    expect(find.text('Study'), findsOneWidget);
+  });
+
   testWidgets("a song's lyrics move with it, its words looked up as a "
       "video's; a word added is tagged with the artist and the song", (
     tester,