feat(app): a note as one card, as before

A note is one card on the tinted ground: its title, its tags behind an
Add tags chip, a line, then its text. The app bar says only how saving
stands; its "Note in …" title goes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMm7usAo6q9ZZRoPkWjoxi
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

halkyon_learn_flutter/lib/l10n/app_localizations_en.dart

@@ -771,16 +771,6 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get noteDeleted => 'Note deleted';
 
-  @override
-  String noteNewTitleFor(String title) {
-    return 'New note in \"$title\"';
-  }
-
-  @override
-  String noteTitleFor(String title) {
-    return 'Note in \"$title\"';
-  }
-
   @override
   String get noteTitleHint => 'Title';
 
@@ -813,7 +803,7 @@ class AppLocalizationsEn extends AppLocalizations {
   String get noteAddTags => 'Add tags';
 
   @override
-  String get noteTags => 'Tags';
+  String get noteEditTags => 'Edit tags';
 
   @override
   String get studysetFlashcardsEmpty => 'No flashcards yet';