Stage 1: project setup, Exercise Library, both Mode designs and the Mode switch

- Flutter Android app on CookIT's stack (provider, shared_preferences, gen-l10n)
- tools/exercise-import turns free-exercise-db into 876 bundled Exercises
  with 1,746 WebP images (20 MB); stretching -> Stretching, rest -> Workout
- ZenStyle tokens per Mode: calm rounded sage/teal with breath ripples vs.
  dark ember-to-red with floor-tape slashes; the theme morphs at each
  Mode's own pace
- Remembered global Mode switch, Plans / Library / History tabs

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/src/history/views/history_view.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+
+import '../../design/page_header.dart';
+import '../../localization/app_localizations.dart';
+
+/// The current Mode's finished Sessions.
+class HistoryView extends StatelessWidget {
+  const HistoryView({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    return ListView(
+      children: [
+        PageHeader(title: l10n.historyTitle),
+        const SizedBox(height: 24),
+        EmptyState(icon: Icons.history_rounded, title: l10n.historyEmptyTitle, body: l10n.historyEmptyBody),
+      ],
+    );
+  }
+}