Feature: Add AI-Powered Categorization section to Recategorize page

Add new card for AI categorization alongside rule-based:
- Rename existing section to "Rule-Based Categorization"
- Add "AI-Powered Categorization" section with provider badge
- Link to AICategorizePreview for AI category suggestions
- Display explanation of how AI categorization works
- Inject IConfiguration to read AI provider setting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

MoneyMap/Pages/Recategorize.cshtml

@@ -48,10 +48,10 @@
 
 <div class="card shadow-sm mb-3">
     <div class="card-header">
-        <strong>Auto-Categorize Existing Transactions</strong>
+        <strong>Rule-Based Categorization</strong>
     </div>
     <div class="card-body">
-        <p>Use the category mappings to automatically categorize transactions that are already in your database.</p>
+        <p>Use the category mappings to automatically categorize transactions based on pattern matching.</p>
 
         <div class="row g-3">
             <div class="col-md-6">
@@ -87,6 +87,51 @@
     </div>
 </div>
 
+<div class="card shadow-sm mb-3">
+    <div class="card-header d-flex justify-content-between align-items-center">
+        <strong>AI-Powered Categorization</strong>
+        <span class="badge bg-info">@Model.AIProvider</span>
+    </div>
+    <div class="card-body">
+        <p>Use AI to analyze transaction names and suggest categories. High-confidence matches will automatically create new mapping rules for future use.</p>
+
+        <div class="row g-3">
+            <div class="col-md-6">
+                <div class="border rounded p-3 h-100">
+                    <h5 class="mb-3">AI Categorize Uncategorized</h5>
+                    <p class="text-muted small">
+                        Process up to 50 uncategorized transactions. Review AI suggestions before applying.
+                    </p>
+                    @if (Model.Stats.Uncategorized > 0)
+                    {
+                        <a asp-page="/AICategorizePreview" class="btn btn-success">
+                            AI Categorize with Preview
+                        </a>
+                    }
+                    else
+                    {
+                        <button type="button" class="btn btn-success" disabled>
+                            AI Categorize with Preview
+                        </button>
+                    }
+                </div>
+            </div>
+
+            <div class="col-md-6">
+                <div class="border rounded p-3 h-100">
+                    <h5 class="mb-3">How AI Categorization Works</h5>
+                    <ul class="text-muted small mb-0">
+                        <li>AI analyzes transaction name, memo, and amount</li>
+                        <li>Suggests category and canonical merchant name</li>
+                        <li>Creates pattern rules for 70%+ confidence matches</li>
+                        <li>Future transactions auto-match the new rules</li>
+                    </ul>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
 <div class="card shadow-sm">
     <div class="card-header">
         <strong>How It Works</strong>

MoneyMap/Pages/Recategorize.cshtml.cs

@@ -11,15 +11,22 @@ namespace MoneyMap.Pages
         private readonly MoneyMapContext _db;
         private readonly ITransactionCategorizer _categorizer;
         private readonly ITransactionStatisticsService _statsService;
+        private readonly IConfiguration _config;
 
-        public RecategorizeModel(MoneyMapContext db, ITransactionCategorizer categorizer, ITransactionStatisticsService statsService)
+        public RecategorizeModel(
+            MoneyMapContext db,
+            ITransactionCategorizer categorizer,
+            ITransactionStatisticsService statsService,
+            IConfiguration config)
         {
             _db = db;
             _categorizer = categorizer;
             _statsService = statsService;
+            _config = config;
         }
 
         public RecategorizeStats Stats { get; set; } = new();
+        public string AIProvider => _config["AI:CategorizationProvider"] ?? "OpenAI";
 
         [TempData]
         public string? SuccessMessage { get; set; }