Give users more control over the exercise cache

This allows users to manually refresh the cache and load all exercises
from the server.

lib/widgets/core/settings.dart

@@ -20,10 +20,10 @@
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:wger/l10n/generated/app_localizations.dart';
-import 'package:wger/providers/exercises.dart';
 import 'package:wger/providers/nutrition.dart';
 import 'package:wger/providers/user.dart';
 import 'package:wger/screens/configure_plates_screen.dart';
+import 'package:wger/widgets/core/settings/exercise_cache.dart';
 
 class SettingsPage extends StatelessWidget {
   static String routeName = '/SettingsPage';
@@ -33,7 +33,6 @@ class SettingsPage extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final i18n = AppLocalizations.of(context);
-    final exerciseProvider = Provider.of<ExercisesProvider>(context, listen: false);
     final nutritionProvider = Provider.of<NutritionPlansProvider>(context, listen: false);
     final userProvider = Provider.of<UserProvider>(context);
 
@@ -47,24 +46,7 @@ class SettingsPage extends StatelessWidget {
               style: Theme.of(context).textTheme.headlineSmall,
             ),
           ),
-          ListTile(
-            title: Text(i18n.settingsExerciseCacheDescription),
-            trailing: IconButton(
-              key: const ValueKey('cacheIconExercises'),
-              icon: const Icon(Icons.delete),
-              onPressed: () async {
-                await exerciseProvider.clearAllCachesAndPrefs();
-
-                if (context.mounted) {
-                  final snackBar = SnackBar(
-                    content: Text(i18n.settingsCacheDeletedSnackbar),
-                  );
-
-                  ScaffoldMessenger.of(context).showSnackBar(snackBar);
-                }
-              },
-            ),
-          ),
+          const SettingsExerciseCache(),
           ListTile(
             title: Text(i18n.settingsIngredientCacheDescription),
             trailing: IconButton(
@@ -83,6 +65,12 @@ class SettingsPage extends StatelessWidget {
               },
             ),
           ),
+          ListTile(
+            title: Text(
+              i18n.others,
+              style: Theme.of(context).textTheme.headlineSmall,
+            ),
+          ),
           ListTile(
             title: Text(i18n.themeMode),
             trailing: DropdownButton<ThemeMode>(

lib/widgets/core/settings/exercise_cache.dart

@@ -0,0 +1,89 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:wger/l10n/generated/app_localizations.dart';
+import 'package:wger/providers/exercises.dart';
+
+class SettingsExerciseCache extends StatefulWidget {
+  const SettingsExerciseCache({super.key});
+
+  @override
+  State<SettingsExerciseCache> createState() => _SettingsExerciseCacheState();
+}
+
+class _SettingsExerciseCacheState extends State<SettingsExerciseCache> {
+  bool _isRefreshLoading = false;
+  String _subtitle = '';
+
+  @override
+  Widget build(BuildContext context) {
+    final exerciseProvider = Provider.of<ExercisesProvider>(context, listen: false);
+    final i18n = AppLocalizations.of(context);
+
+    return ListTile(
+      enabled: !_isRefreshLoading,
+      title: Text(i18n.settingsExerciseCacheDescription),
+      subtitle: _subtitle.isNotEmpty ? Text(_subtitle) : null,
+      trailing: Row(mainAxisSize: MainAxisSize.min, children: [
+        IconButton(
+          key: const ValueKey('cacheIconExercisesRefresh'),
+          icon: _isRefreshLoading
+              ? const SizedBox(
+                  width: 24,
+                  height: 24,
+                  child: CircularProgressIndicator(strokeWidth: 2),
+                )
+              : const Icon(Icons.refresh),
+          onPressed: _isRefreshLoading
+              ? null
+              : () async {
+                  setState(() => _isRefreshLoading = true);
+
+                  // Note: status messages are currently left in English on purpose
+                  try {
+                    setState(() => _subtitle = 'Clearing cache...');
+                    await exerciseProvider.clearAllCachesAndPrefs();
+
+                    if (mounted) {
+                      setState(() => _subtitle = 'Loading languages and units...');
+                    }
+                    await exerciseProvider.fetchAndSetInitialData();
+
+                    if (mounted) {
+                      setState(() => _subtitle = 'Loading all exercises from server...');
+                    }
+                    await exerciseProvider.fetchAndSetAllExercises();
+
+                    if (mounted) {
+                      setState(() => _subtitle = '');
+                    }
+                  } finally {
+                    if (mounted) {
+                      setState(() => _isRefreshLoading = false);
+                    }
+                    if (context.mounted) {
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text(i18n.success)),
+                      );
+                    }
+                  }
+                },
+        ),
+        IconButton(
+          key: const ValueKey('cacheIconExercisesDelete'),
+          icon: const Icon(Icons.delete),
+          onPressed: () async {
+            await exerciseProvider.clearAllCachesAndPrefs();
+
+            if (context.mounted) {
+              final snackBar = SnackBar(
+                content: Text(i18n.settingsCacheDeletedSnackbar),
+              );
+
+              ScaffoldMessenger.of(context).showSnackBar(snackBar);
+            }
+          },
+        )
+      ]),
+    );
+  }
+}