feat: Introduce PokemonImage component for robust image loading with fallback and shiny support, and update iOS platform to 15.0.

lib/components/pokemon_image.dart

@@ -0,0 +1,87 @@
+import 'package:flutter/material.dart';
+
+class PokemonImage extends StatelessWidget {
+  final String imageUrl;
+  final String? fallbackUrl;
+  final BoxFit fit;
+  final double? width;
+  final double? height;
+  final Color? color;
+  final BlendMode? colorBlendMode;
+
+  const PokemonImage({
+    super.key,
+    required this.imageUrl,
+    this.fallbackUrl,
+    this.fit = BoxFit.contain,
+    this.width,
+    this.height,
+    this.color,
+    this.colorBlendMode,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Image.network(
+      imageUrl,
+      fit: fit,
+      width: width,
+      height: height,
+      color: color,
+      colorBlendMode: colorBlendMode,
+      errorBuilder: (context, error, stackTrace) {
+        // If the primary image fails and we have a fallback, try the fallback
+        if (fallbackUrl != null && fallbackUrl != imageUrl) {
+          return Image.network(
+            fallbackUrl!,
+            fit: fit,
+            width: width,
+            height: height,
+            color: color,
+            colorBlendMode: colorBlendMode,
+            errorBuilder: (context, error, stackTrace) {
+              // If the fallback also fails, show a placeholder
+              return _buildPlaceholder();
+            },
+          );
+        }
+        // No fallback, show placeholder
+        return _buildPlaceholder();
+      },
+      loadingBuilder: (context, child, loadingProgress) {
+        if (loadingProgress == null) return child;
+        return Center(
+          child: CircularProgressIndicator(
+            value: loadingProgress.expectedTotalBytes != null
+                ? loadingProgress.cumulativeBytesLoaded / loadingProgress.expectedTotalBytes!
+                : null,
+          ),
+        );
+      },
+    );
+  }
+
+  Widget _buildPlaceholder() {
+    return Center(
+      child: Column(
+        mainAxisAlignment: MainAxisAlignment.center,
+        children: [
+          Icon(
+            Icons.help_outline,
+            size: (width ?? 40) * 0.5,
+            color: Colors.grey[400],
+          ),
+          if ((width ?? 100) > 60)
+            Text(
+              "Not Found",
+              style: TextStyle(
+                color: Colors.grey[600],
+                fontSize: 10,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+        ],
+      ),
+    );
+  }
+}

lib/components/pokemon_tile.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import '../models/pokemon.dart';
+import 'pokemon_image.dart';
 
 class PokemonTile extends StatelessWidget {
   const PokemonTile(this.pokemon, {Key? key}) : super(key: key);
@@ -41,7 +42,7 @@ class PokemonTile extends StatelessWidget {
                 borderRadius: BorderRadius.circular(4),
               ),
               child: pokemon.isCaught 
-                ? Image.network(pokemon.imageUrl, fit: BoxFit.contain)
+                ? PokemonImage(imageUrl: pokemon.imageUrl, fit: BoxFit.contain)
                 : const SizedBox.expand(),
             ),
             const SizedBox(width: 16),