feat(frontend): implemented mobile friendly UI responsiveness

7project/frontend/src/pages/BalanceChart.tsx

@@ -1,5 +1,6 @@
 // src/BalanceChart.tsx
-import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer } from 'recharts';
+import { useEffect, useRef, useState } from 'react';
+import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, Legend } from 'recharts';
 import { type BalancePoint } from '../api';
 
 function formatAmount(n: number) {
@@ -10,37 +11,56 @@ function formatDate(dateStr: string) {
   return new Date(dateStr).toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
 }
 
-export default function BalanceChart({ data }: { data: BalancePoint[] }) {
+type Props = { data: BalancePoint[]; pxPerPoint?: number };
+
+export default function BalanceChart({ data, pxPerPoint = 40 }: Props) {
+  const wrapRef = useRef<HTMLDivElement | null>(null);
+  const [containerWidth, setContainerWidth] = useState(0);
+
+  useEffect(() => {
+    function measure() {
+      if (!wrapRef.current) return;
+      setContainerWidth(wrapRef.current.clientWidth);
+    }
+    measure();
+    const obs = new ResizeObserver(measure);
+    if (wrapRef.current) obs.observe(wrapRef.current);
+    return () => obs.disconnect();
+  }, []);
+
   if (data.length === 0) {
     return <div>No data to display</div>;
   }
 
+  const desiredWidth = Math.max(containerWidth, Math.max(600, data.length * pxPerPoint));
+
   return (
-    <ResponsiveContainer width="100%" height={300}>
-      <LineChart
-        data={data}
-        // Increased 'left' margin to create more space for the Y-axis label and tick values
-        margin={{ top: 5, right: 30, left: 50, bottom: 5 }} // <-- Change this line
-      >
-        <CartesianGrid strokeDasharray="3 3" />
-        <XAxis
-          dataKey="date"
-          tickFormatter={formatDate}
-          label={{ value: 'Date', position: 'insideBottom', offset: -5 }}
-        />
-        <YAxis
-          tickFormatter={(value) => formatAmount(value as number)}
-          // Adjusted 'offset' for the Y-axis label.
-          // A negative offset moves it further away from the axis.
-          label={{ value: 'Balance', angle: -90, position: 'insideLeft', offset: -30 }} // <-- Change this line
-        />
-        <Tooltip
-          labelFormatter={formatDate}
-          formatter={(value) => [formatAmount(value as number), 'Balance']}
-        />
-        <Legend />
-        <Line type="monotone" dataKey="balance" stroke="#3b82f6" strokeWidth={2} activeDot={{ r: 8 }} />
-      </LineChart>
-    </ResponsiveContainer>
+    <div ref={wrapRef} className="chart-scroll">
+      <div className="chart-inner" style={{ minWidth: desiredWidth, paddingBottom: 8 }}>
+        <LineChart
+          width={desiredWidth}
+          height={300}
+          data={data}
+          margin={{ top: 5, right: 30, left: 50, bottom: 5 }}
+        >
+          <CartesianGrid strokeDasharray="3 3" />
+          <XAxis
+            dataKey="date"
+            tickFormatter={formatDate}
+            label={{ value: 'Date', position: 'insideBottom', offset: -5 }}
+          />
+          <YAxis
+            tickFormatter={(value) => formatAmount(value as number)}
+            label={{ value: 'Balance', angle: -90, position: 'insideLeft', offset: -30 }}
+          />
+          <Tooltip
+            labelFormatter={formatDate}
+            formatter={(value) => [formatAmount(value as number), 'Balance']}
+          />
+          <Legend />
+          <Line type="monotone" dataKey="balance" stroke="#3b82f6" strokeWidth={2} activeDot={{ r: 8 }} />
+        </LineChart>
+      </div>
+    </div>
   );
 }