test(tag): the tag filter has room beside four material tabs

The test font draws every letter as a full square, so at 1,200 wide the
four tabs left the flashcards' filter folded into the menu.

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/tag/widget/tag_widgets_test.dart

@@ -68,7 +68,9 @@ void main() {
   /// Opens the studyset `japanese`, with the cards and tags the test stored
   /// through [cards] and [tags]: the app reads them from the same gateways.
   Future<void> showList(WidgetTester tester) async {
-    tester.view.physicalSize = const Size(1200, 1600);
+    // Wide enough for the flashcards' filter beside four tabs, in the test
+    // font's square letters.
+    tester.view.physicalSize = const Size(1600, 1600);
     tester.view.devicePixelRatio = 1;
     addTearDown(tester.view.reset);
     final studysets = FakeStudysetGateway()