Add filter to subscription-list

flutter/lib/components/filter_chips/filter_chips.dart

@@ -0,0 +1,47 @@
+import 'package:flutter/material.dart';
+
+class FilterChips<T extends Enum> extends StatelessWidget {
+  final List<(T, String)> options;
+  final T value;
+  final void Function(T)? onChanged;
+
+  const FilterChips({
+    Key? key,
+    required this.options,
+    required this.value,
+    required this.onChanged,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+      scrollDirection: Axis.horizontal,
+      child: Row(
+        children: [
+          for (var opt in options) _buildChiplet(context, opt.$1, opt.$2),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildChiplet(BuildContext context, T optValue, String optText) {
+    final isSelected = optValue == value;
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(0, 2, 4, 2),
+      child: InputChip(
+        label: Text(
+          optText,
+          style: isSelected ? TextStyle(color: Theme.of(context).colorScheme.onPrimary) : null,
+        ),
+        visualDensity: VisualDensity(horizontal: -4, vertical: -4),
+        isEnabled: true,
+        selected: true,
+        showCheckmark: false,
+        onPressed: () {
+          if (!isSelected) onChanged?.call(optValue);
+        },
+        selectedColor: isSelected ? Theme.of(context).colorScheme.primary : null,
+      ),
+    );
+  }
+}