feat(divination): 重构手动起卦教程，支持三硬币交互选择

apps/lib/shared/widgets/divination/divination_shared_widgets.dart

@@ -5,15 +5,24 @@ import '../../theme/app_color_palette.dart';
 import '../../theme/design_tokens.dart';
 
 class DivinationGuideImage extends StatelessWidget {
-  const DivinationGuideImage({super.key, required this.path});
+  const DivinationGuideImage({super.key, required this.paths});
 
-  final String path;
+  final List<String> paths;
 
   @override
   Widget build(BuildContext context) {
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: AppSpacing.lg),
-      child: Image.asset(path, fit: BoxFit.contain),
+      child: paths.length == 1
+          ? Image.asset(paths.first, fit: BoxFit.contain)
+          : Row(
+              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+              children: [
+                Expanded(child: Image.asset(paths[0], fit: BoxFit.contain)),
+                const SizedBox(width: AppSpacing.md),
+                Expanded(child: Image.asset(paths[1], fit: BoxFit.contain)),
+              ],
+            ),
     );
   }
 }
@@ -67,17 +76,31 @@ class DivinationInstructionCard extends StatelessWidget {
   }
 }
 
-class DivinationGuideDialog extends StatelessWidget {
+class DivinationGuideDialog extends StatefulWidget {
   const DivinationGuideDialog({
     super.key,
     required this.title,
     required this.guideImages,
-    required this.instructionText,
+    required this.instructions,
   });
 
   final String title;
-  final List<String> guideImages;
-  final String instructionText;
+  final List<List<String>> guideImages;
+  final List<String> instructions;
+
+  @override
+  State<DivinationGuideDialog> createState() => _DivinationGuideDialogState();
+}
+
+class _DivinationGuideDialogState extends State<DivinationGuideDialog> {
+  final PageController _pageController = PageController();
+  int _currentPage = 0;
+
+  @override
+  void dispose() {
+    _pageController.dispose();
+    super.dispose();
+  }
 
   @override
   Widget build(BuildContext context) {
@@ -90,7 +113,7 @@ class DivinationGuideDialog extends StatelessWidget {
           children: [
             const SizedBox(height: AppSpacing.lg),
             Text(
-              title,
+              widget.title,
               style: Theme.of(context).textTheme.titleLarge?.copyWith(
                 color: Theme.of(context).colorScheme.primary,
                 fontWeight: FontWeight.w700,
@@ -98,15 +121,25 @@ class DivinationGuideDialog extends StatelessWidget {
             ),
             const SizedBox(height: AppSpacing.md),
             Expanded(
-              child: PageView(
-                children: guideImages
-                    .map((path) => DivinationGuideImage(path: path))
-                    .toList(),
+              child: PageView.builder(
+                controller: _pageController,
+                onPageChanged: (index) {
+                  setState(() {
+                    _currentPage = index;
+                  });
+                },
+                itemCount: widget.guideImages.length,
+                itemBuilder: (context, index) {
+                  return DivinationGuideImage(paths: widget.guideImages[index]);
+                },
               ),
             ),
             Padding(
               padding: const EdgeInsets.all(AppSpacing.lg),
-              child: Text(instructionText),
+              child: Text(
+                widget.instructions[_currentPage],
+                textAlign: TextAlign.center,
+              ),
             ),
             Padding(
               padding: const EdgeInsets.fromLTRB(