Fix MonthlyTrends dynamic title, remove Period Summary, convert BalanceChart to stacked area chart

Co-authored-by: elisiariocouto <818914+elisiariocouto@users.noreply.github.com>

frontend/src/components/analytics/BalanceChart.tsx

@@ -1,6 +1,6 @@
 import {
-  LineChart,
-  Line,
+  AreaChart,
+  Area,
   XAxis,
   YAxis,
   CartesianGrid,
@@ -111,7 +111,7 @@ export default function BalanceChart({ data, accounts, className }: BalanceChart
       </h3>
       <div className="h-80">
         <ResponsiveContainer width="100%" height="100%">
-          <LineChart data={finalData}>
+          <AreaChart data={finalData}>
             <CartesianGrid strokeDasharray="3 3" />
             <XAxis
               dataKey="date"
@@ -131,25 +131,25 @@ export default function BalanceChart({ data, accounts, className }: BalanceChart
               tickFormatter={(value) => `€${value.toLocaleString()}`}
             />
             <Tooltip
-              formatter={(value: number) => [
+              formatter={(value: number, name: string) => [
                 `€${value.toLocaleString()}`,
-                "Balance",
+                getAccountDisplayName(name),
               ]}
               labelFormatter={(label) => `Date: ${label}`}
             />
             <Legend />
             {Object.keys(accountBalances).map((accountId, index) => (
-              <Line
+              <Area
                 key={accountId}
                 type="monotone"
                 dataKey={accountId}
+                stackId="1"
+                fill={colors[index % colors.length]}
                 stroke={colors[index % colors.length]}
-                strokeWidth={2}
-                dot={{ r: 4 }}
                 name={getAccountDisplayName(accountId)}
               />
             ))}
-          </LineChart>
+          </AreaChart>
         </ResponsiveContainer>
       </div>
     </div>

frontend/src/components/analytics/MonthlyTrends.tsx

@@ -53,7 +53,7 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
       
       if (!monthlyMap[monthKey]) {
         monthlyMap[monthKey] = {
-          month: date.toLocaleDateString(undefined, { 
+          month: date.toLocaleDateString('en-GB', { 
             year: 'numeric', 
             month: 'short' 
           }),
@@ -77,10 +77,20 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
       ...Object.entries(monthlyMap)
         .sort(([a], [b]) => a.localeCompare(b))
         .map(([, data]) => data)
-        .slice(-12) // Last 12 months
     );
   }
 
+  // Calculate number of months to display based on days filter
+  const getMonthsToDisplay = (days: number): number => {
+    if (days <= 30) return 1;
+    if (days <= 180) return 6;
+    if (days <= 365) return 12;
+    return Math.ceil(days / 30);
+  };
+
+  const monthsToDisplay = getMonthsToDisplay(days);
+  const displayData = monthlyData.slice(-monthsToDisplay);
+
   if (isLoading) {
     return (
       <div className={className}>
@@ -94,7 +104,7 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
     );
   }
 
-  if (monthlyData.length === 0) {
+  if (displayData.length === 0) {
     return (
       <div className={className}>
         <h3 className="text-lg font-medium text-gray-900 mb-4">
@@ -123,14 +133,22 @@ export default function MonthlyTrends({ className, days = 365 }: MonthlyTrendsPr
     return null;
   };
 
+  // Generate dynamic title based on time period
+  const getTitle = (days: number): string => {
+    if (days <= 30) return "Monthly Spending Trends (Last 30 Days)";
+    if (days <= 180) return "Monthly Spending Trends (Last 6 Months)";
+    if (days <= 365) return "Monthly Spending Trends (Last 12 Months)";
+    return `Monthly Spending Trends (Last ${Math.ceil(days / 30)} Months)`;
+  };
+
   return (
     <div className={className}>
       <h3 className="text-lg font-medium text-gray-900 mb-4">
-        Monthly Spending Trends (Last 12 Months)
+        {getTitle(days)}
       </h3>
       <div className="h-80">
         <ResponsiveContainer width="100%" height="100%">
-          <BarChart data={monthlyData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
+          <BarChart data={displayData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>
             <CartesianGrid strokeDasharray="3 3" />
             <XAxis 
               dataKey="month" 

frontend/src/routes/analytics.tsx

@@ -144,41 +144,6 @@ function AnalyticsDashboard() {
       <div className="bg-white rounded-lg shadow p-6 border border-gray-200">
         <MonthlyTrends days={selectedPeriod.days} />
       </div>
-
-      {/* Summary Section */}
-      {stats && (
-        <div className="bg-blue-50 rounded-lg p-6 border border-blue-200">
-          <h3 className="text-lg font-medium text-blue-900 mb-4">
-            Period Summary ({stats.period_days} days)
-          </h3>
-          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4 text-sm">
-            <div>
-              <p className="text-blue-700 font-medium">Booked Transactions</p>
-              <p className="text-blue-900">{stats.booked_transactions}</p>
-            </div>
-            <div>
-              <p className="text-blue-700 font-medium">Pending Transactions</p>
-              <p className="text-blue-900">{stats.pending_transactions}</p>
-            </div>
-            <div>
-              <p className="text-blue-700 font-medium">Transaction Ratio</p>
-              <p className="text-blue-900">
-                {stats.total_transactions > 0
-                  ? `${Math.round(
-                      (stats.booked_transactions / stats.total_transactions) * 100
-                    )}% booked`
-                  : "No transactions"}
-              </p>
-            </div>
-            <div>
-              <p className="text-blue-700 font-medium">Spend Rate</p>
-              <p className="text-blue-900">
-                €{((stats.total_expenses || 0) / stats.period_days).toFixed(2)}/day
-              </p>
-            </div>
-          </div>
-        </div>
-      )}
     </div>
   );
 }