feat(frontend): Enhance transactions page with advanced filtering and UI improvements.

- Fix amount range filters (min/max) connection to API parameters
- Add enhanced quick date filters: "This week", "This year" alongside existing options
- Create skeleton loading components (TransactionSkeleton, FiltersSkeleton) to replace simple spinner
- Add running balance column with toggle functionality for both desktop and mobile views
- Consolidate TransactionsList.tsx and TransactionsTable.tsx into single comprehensive component
- Improve UI design with better visual hierarchy, spacing, and responsive layout
- Add proper TypeScript types and fix linting issues

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

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

frontend/src/components/TransactionSkeleton.tsx

@@ -0,0 +1,103 @@
+interface TransactionSkeletonProps {
+  rows?: number;
+  view?: "table" | "mobile";
+}
+
+export default function TransactionSkeleton({
+  rows = 5,
+  view = "table"
+}: TransactionSkeletonProps) {
+  const skeletonRows = Array.from({ length: rows }, (_, index) => index);
+
+  if (view === "mobile") {
+    return (
+      <div className="bg-white rounded-lg shadow divide-y divide-gray-200">
+        {skeletonRows.map((_, index) => (
+          <div key={index} className="p-4 animate-pulse">
+            <div className="flex items-start justify-between">
+              <div className="flex-1">
+                <div className="flex items-start space-x-3">
+                  <div className="p-2 rounded-full bg-gray-200 flex-shrink-0">
+                    <div className="h-4 w-4 bg-gray-300 rounded"></div>
+                  </div>
+                  <div className="flex-1 min-w-0 space-y-2">
+                    <div className="h-4 bg-gray-200 rounded w-3/4"></div>
+                    <div className="space-y-1">
+                      <div className="h-3 bg-gray-200 rounded w-1/2"></div>
+                      <div className="h-3 bg-gray-200 rounded w-2/3"></div>
+                      <div className="h-3 bg-gray-200 rounded w-1/3"></div>
+                    </div>
+                  </div>
+                </div>
+              </div>
+              <div className="text-right ml-3 flex-shrink-0 space-y-2">
+                <div className="h-6 bg-gray-200 rounded w-20"></div>
+                <div className="h-4 bg-gray-200 rounded w-16 ml-auto"></div>
+                <div className="h-6 bg-gray-200 rounded w-12 ml-auto"></div>
+              </div>
+            </div>
+          </div>
+        ))}
+      </div>
+    );
+  }
+
+  return (
+    <div className="bg-white rounded-lg shadow overflow-hidden">
+      <div className="overflow-x-auto">
+        <table className="min-w-full divide-y divide-gray-200">
+          <thead className="bg-gray-50">
+            <tr>
+              <th className="px-6 py-3 text-left">
+                <div className="h-4 bg-gray-200 rounded w-20 animate-pulse"></div>
+              </th>
+              <th className="px-6 py-3 text-left">
+                <div className="h-4 bg-gray-200 rounded w-16 animate-pulse"></div>
+              </th>
+              <th className="px-6 py-3 text-left">
+                <div className="h-4 bg-gray-200 rounded w-12 animate-pulse"></div>
+              </th>
+              <th className="px-6 py-3 text-left">
+                <div className="h-4 bg-gray-200 rounded w-8 animate-pulse"></div>
+              </th>
+            </tr>
+          </thead>
+          <tbody className="bg-white divide-y divide-gray-200">
+            {skeletonRows.map((_, index) => (
+              <tr key={index} className="animate-pulse">
+                <td className="px-6 py-4">
+                  <div className="flex items-start space-x-3">
+                    <div className="p-2 rounded-full bg-gray-200 flex-shrink-0">
+                      <div className="h-4 w-4 bg-gray-300 rounded"></div>
+                    </div>
+                    <div className="flex-1 space-y-2">
+                      <div className="h-4 bg-gray-200 rounded w-3/4"></div>
+                      <div className="space-y-1">
+                        <div className="h-3 bg-gray-200 rounded w-1/2"></div>
+                        <div className="h-3 bg-gray-200 rounded w-2/3"></div>
+                      </div>
+                    </div>
+                  </div>
+                </td>
+                <td className="px-6 py-4">
+                  <div className="text-right">
+                    <div className="h-6 bg-gray-200 rounded w-24 ml-auto mb-1"></div>
+                  </div>
+                </td>
+                <td className="px-6 py-4">
+                  <div className="space-y-1">
+                    <div className="h-4 bg-gray-200 rounded w-20"></div>
+                    <div className="h-3 bg-gray-200 rounded w-16"></div>
+                  </div>
+                </td>
+                <td className="px-6 py-4">
+                  <div className="h-6 bg-gray-200 rounded w-12"></div>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      </div>
+    </div>
+  );
+}