feat(mobile): immich-ui icon button (#24502)

* feat(mobile): immich-ui icon button

* fix lint

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/presentation/pages/dev/ui_showcase.page.dart

@@ -0,0 +1,51 @@
+import 'package:auto_route/auto_route.dart';
+import 'package:flutter/material.dart';
+import 'package:immich_mobile/extensions/build_context_extensions.dart';
+import 'package:immich_ui/immich_ui.dart';
+
+List<Widget> _showcaseBuilder(Function(ImmichVariant variant, ImmichColor color) builder) {
+  final children = <Widget>[];
+
+  final items = [
+    (variant: ImmichVariant.filled, title: "Filled Variant"),
+    (variant: ImmichVariant.ghost, title: "Ghost Variant"),
+  ];
+
+  for (final (:variant, :title) in items) {
+    children.add(Text(title));
+    children.add(Row(spacing: 10, children: [for (var color in ImmichColor.values) builder(variant, color)]));
+  }
+
+  return children;
+}
+
+@RoutePage()
+class ImmichUIShowcasePage extends StatelessWidget {
+  const ImmichUIShowcasePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Immich UI Showcase')),
+      body: Padding(
+        padding: const EdgeInsets.all(20),
+        child: SingleChildScrollView(
+          child: Column(
+            spacing: 10,
+            mainAxisAlignment: MainAxisAlignment.start,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text("IconButton", style: context.textTheme.titleLarge),
+              ..._showcaseBuilder(
+                (variant, color) =>
+                    ImmichIconButton(icon: Icons.favorite, color: color, variant: variant, onTap: () {}),
+              ),
+              Text("CloseButton", style: context.textTheme.titleLarge),
+              ..._showcaseBuilder((variant, color) => ImmichCloseButton(color: color, variant: variant, onTap: () {})),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}