Light theme default + yt-dlp search fallback

lib/models/radar_recommendation.dart

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+import 'video_item.dart';
+
+enum RadarSessionMode {
+  normal,
+  discovery,
+  learn,
+  relax,
+  short,
+  long,
+}
+
+extension RadarSessionModeLabel on RadarSessionMode {
+  String get label {
+    switch (this) {
+      case RadarSessionMode.normal:
+        return 'Comme d’habitude';
+      case RadarSessionMode.discovery:
+        return 'Je veux du nouveau';
+      case RadarSessionMode.learn:
+        return 'Apprendre';
+      case RadarSessionMode.relax:
+        return 'Détente';
+      case RadarSessionMode.short:
+        return 'Courtes vidéos';
+      case RadarSessionMode.long:
+        return 'Long format';
+    }
+  }
+
+  String get shortLabel {
+    switch (this) {
+      case RadarSessionMode.normal:
+        return 'Normal';
+      case RadarSessionMode.discovery:
+        return 'Découverte';
+      case RadarSessionMode.learn:
+        return 'Apprendre';
+      case RadarSessionMode.relax:
+        return 'Détente';
+      case RadarSessionMode.short:
+        return 'Court';
+      case RadarSessionMode.long:
+        return 'Long';
+    }
+  }
+}
+
+enum RadarLane {
+  forYou,
+  continueTopic,
+  discovery,
+}
+
+class RadarRecommendation {
+  const RadarRecommendation({
+    required this.video,
+    required this.score,
+    required this.reasons,
+    required this.breakdown,
+    required this.lane,
+    required this.matchedTerms,
+    required this.isNewAuthor,
+  });
+
+  final VideoItem video;
+  final int score;
+  final List<String> reasons;
+  final Map<String, int> breakdown;
+  final RadarLane lane;
+  final List<String> matchedTerms;
+  final bool isNewAuthor;
+}
+
+class RadarFeed {
+  const RadarFeed({
+    required this.mode,
+    required this.generatedAt,
+    required this.profileTopics,
+    required this.primary,
+    required this.continueTopic,
+    required this.discovery,
+    this.categories = const <String, List<RadarRecommendation>>{},
+  });
+
+  final RadarSessionMode mode;
+  final DateTime generatedAt;
+  final List<String> profileTopics;
+  final List<RadarRecommendation> primary;
+  final List<RadarRecommendation> continueTopic;
+  final List<RadarRecommendation> discovery;
+
+  /// Primary local classification of proposed videos.
+  ///
+  /// A recommendation belongs to one main category so the category lanes
+  /// stay clean and predictable.
+  final Map<String, List<RadarRecommendation>> categories;
+
+  bool get isEmpty =>
+      primary.isEmpty &&
+      continueTopic.isEmpty &&
+      discovery.isEmpty;
+}