feat(import): implement recipe import functionality with file and URL support

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/features/recipes/presentation/create_recipe_screen.dart

@@ -11,7 +11,10 @@ import '../domain/parsed_recipe.dart';
 enum _Step { input, review }
 
 class CreateRecipeScreen extends ConsumerStatefulWidget {
-  const CreateRecipeScreen({super.key});
+  /// Optional markdown to pre-fill the input field, e.g. from import.
+  final String? initialMarkdown;
+
+  const CreateRecipeScreen({super.key, this.initialMarkdown});
 
   @override
   ConsumerState<CreateRecipeScreen> createState() =>
@@ -22,10 +25,16 @@ class _CreateRecipeScreenState extends ConsumerState<CreateRecipeScreen> {
   _Step _step = _Step.input;
 
   // Step 1 — markdown input
-  final _markdownCtrl = TextEditingController();
+  late final TextEditingController _markdownCtrl;
   bool _isParsing = false;
   String? _parseError;
 
+  @override
+  void initState() {
+    super.initState();
+    _markdownCtrl = TextEditingController(text: widget.initialMarkdown ?? '');
+  }
+
   // Step 2 — review state
   ParsedRecipe? _parsed;
   late TextEditingController _nameCtrl;
@@ -39,7 +48,7 @@ class _CreateRecipeScreenState extends ConsumerState<CreateRecipeScreen> {
 
   @override
   void dispose() {
-    _markdownCtrl.dispose();
+    _markdownCtrl.dispose();  // always non-null after initState
     if (_step == _Step.review) {
       _nameCtrl.dispose();
       _servingsCtrl.dispose();