Add search functionality to transactions page

Added a search bar that allows users to filter transactions by:
- Transaction name
- Memo
- Category
- Notes
- Merchant name

The search uses a case-sensitive contains filter across all these
fields. The search parameter is preserved across pagination links and
included in the "Clear Filters" button logic.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

MoneyMap/Pages/Transactions.cshtml

@@ -13,6 +13,10 @@
 <div class="card shadow-sm mb-3">
     <div class="card-body">
         <form method="get" class="row g-3">
+            <div class="col-md-12 mb-2">
+                <label for="Search" class="form-label">Search</label>
+                <input asp-for="Search" type="text" class="form-control" placeholder="Search by name, memo, category, notes, or merchant..." />
+            </div>
             <div class="col-md-2">
                 <label for="Category" class="form-label">Category</label>
                 <select asp-for="Category" class="form-select">
@@ -55,7 +59,7 @@
                 <button type="submit" class="btn btn-primary w-100">Filter</button>
             </div>
         </form>
-        @if (!string.IsNullOrWhiteSpace(Model.Category) || !string.IsNullOrWhiteSpace(Model.Merchant) || !string.IsNullOrWhiteSpace(Model.CardId) || Model.StartDate.HasValue || Model.EndDate.HasValue)
+        @if (!string.IsNullOrWhiteSpace(Model.Search) || !string.IsNullOrWhiteSpace(Model.Category) || !string.IsNullOrWhiteSpace(Model.Merchant) || !string.IsNullOrWhiteSpace(Model.CardId) || Model.StartDate.HasValue || Model.EndDate.HasValue)
         {
             <div class="mt-2">
                 <a asp-page="/Transactions" class="btn btn-sm btn-outline-secondary">Clear Filters</a>
@@ -207,6 +211,7 @@ else
                 <a class="page-link"
                    asp-page="/Transactions"
                    asp-route-pageNumber="@(Model.PageNumber - 1)"
+                   asp-route-search="@Model.Search"
                    asp-route-category="@Model.Category"
                    asp-route-merchant="@Model.Merchant"
                    asp-route-cardId="@Model.CardId"
@@ -223,6 +228,7 @@ else
                     <a class="page-link"
                        asp-page="/Transactions"
                        asp-route-pageNumber="1"
+                       asp-route-search="@Model.Search"
                        asp-route-category="@Model.Category"
                        asp-route-merchant="@Model.Merchant"
                        asp-route-cardId="@Model.CardId"
@@ -241,6 +247,7 @@ else
                     <a class="page-link"
                        asp-page="/Transactions"
                        asp-route-pageNumber="@i"
+                       asp-route-search="@Model.Search"
                        asp-route-category="@Model.Category"
                        asp-route-merchant="@Model.Merchant"
                        asp-route-cardId="@Model.CardId"
@@ -259,6 +266,7 @@ else
                     <a class="page-link"
                        asp-page="/Transactions"
                        asp-route-pageNumber="@Model.TotalPages"
+                       asp-route-search="@Model.Search"
                        asp-route-category="@Model.Category"
                        asp-route-merchant="@Model.Merchant"
                        asp-route-cardId="@Model.CardId"
@@ -274,6 +282,7 @@ else
                 <a class="page-link"
                    asp-page="/Transactions"
                    asp-route-pageNumber="@(Model.PageNumber + 1)"
+                   asp-route-search="@Model.Search"
                    asp-route-category="@Model.Category"
                    asp-route-merchant="@Model.Merchant"
                    asp-route-cardId="@Model.CardId"

MoneyMap/Pages/Transactions.cshtml.cs

@@ -19,6 +19,9 @@ namespace MoneyMap.Pages
             _db = db;
         }
 
+        [BindProperty(SupportsGet = true)]
+        public string? Search { get; set; }
+
         [BindProperty(SupportsGet = true)]
         public string? Category { get; set; }
 
@@ -58,6 +61,16 @@ namespace MoneyMap.Pages
                 .AsQueryable();
 
             // Apply filters
+            if (!string.IsNullOrWhiteSpace(Search))
+            {
+                query = query.Where(t =>
+                    t.Name.Contains(Search) ||
+                    (t.Memo != null && t.Memo.Contains(Search)) ||
+                    (t.Category != null && t.Category.Contains(Search)) ||
+                    (t.Notes != null && t.Notes.Contains(Search)) ||
+                    (t.Merchant != null && t.Merchant.Name.Contains(Search)));
+            }
+
             if (!string.IsNullOrWhiteSpace(Category))
             {
                 if (Category == "(blank)")