Update card editing to redirect to account details

Modify EditCard page to:
- Accept optional accountId parameter to pre-select account for new cards
- Redirect to AccountDetails page after save (if card has linked account)
- Update navigation to go back to Accounts instead of Cards page

This integrates card management into the account-centric workflow.

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

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

MoneyMap/Pages/EditCard.cshtml

@@ -6,7 +6,7 @@
 
 <div class="d-flex justify-content-between align-items-center mb-3">
     <h2>@(Model.IsNewCard ? "Add Card" : "Edit Card")</h2>
-    <a asp-page="/Cards" class="btn btn-outline-secondary">Back to Cards</a>
+    <a asp-page="/Accounts" class="btn btn-outline-secondary">Back to Accounts</a>
 </div>
 
 <div class="row">
@@ -71,7 +71,7 @@
                         <button type="submit" class="btn btn-primary">
                             @(Model.IsNewCard ? "Add Card" : "Save Changes")
                         </button>
-                        <a asp-page="/Cards" class="btn btn-secondary">Cancel</a>
+                        <a asp-page="/Accounts" class="btn btn-secondary">Cancel</a>
                     </div>
                 </form>
             </div>

MoneyMap/Pages/EditCard.cshtml.cs

@@ -27,7 +27,7 @@ namespace MoneyMap.Pages
         [TempData]
         public string? SuccessMessage { get; set; }
 
-        public async Task<IActionResult> OnGetAsync(int? id)
+        public async Task<IActionResult> OnGetAsync(int? id, int? accountId)
         {
             await LoadAvailableAccountsAsync();
 
@@ -52,6 +52,12 @@ namespace MoneyMap.Pages
             else
             {
                 IsNewCard = true;
+
+                // Pre-select account if accountId parameter is provided
+                if (accountId.HasValue)
+                {
+                    Card.AccountId = accountId.Value;
+                }
             }
 
             return Page();
@@ -98,7 +104,15 @@ namespace MoneyMap.Pages
             }
 
             await _db.SaveChangesAsync();
-            return RedirectToPage("/Cards");
+
+            // Redirect back to account details if card is linked to an account
+            if (Card.AccountId.HasValue)
+            {
+                return RedirectToPage("/AccountDetails", new { id = Card.AccountId.Value });
+            }
+
+            // Otherwise redirect to accounts list
+            return RedirectToPage("/Accounts");
         }
 
         private async Task LoadAvailableAccountsAsync()