fix: make Max wait readable in chart tooltip and legend

The Max bar uses a dark fill with bright stroke for the outlined look,
but Recharts pulled tooltip/legend text color from the dark fill — making
the Max row unreadable against the dark tooltip background. Render the
tooltip via a custom content fn and recolor the legend's Max label so
both pick up the bright stroke color instead.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

components/charts/WeeklyStatsChart.tsx

@@ -27,6 +27,9 @@ function shortDay(localDate: string): string {
 
 export default function WeeklyStatsChart({ data, hasFastLane, mode }: Props) {
   const showFastLane = mode === "fastLane" && hasFastLane;
+  const avgColor = showFastLane ? "#ff4d8d" : "#4ade80";
+  const maxColor = showFastLane ? "#ff4d8d" : "#22c55e";
+  const maxFill = showFastLane ? "#3d0f22" : "#0a1a0d";
   const chartData = data.map((d) => ({
     day: shortDay(d.localDate),
     avg: showFastLane
@@ -43,22 +46,43 @@ export default function WeeklyStatsChart({ data, hasFastLane, mode }: Props) {
           <XAxis dataKey="day" stroke="#737373" tick={{ fontSize: 11, fill: "#737373" }} tickLine={false} />
           <YAxis stroke="#737373" tick={{ fontSize: 11, fill: "#737373" }} tickLine={false} axisLine={false} />
           <Tooltip
-            contentStyle={{
-              background: "#1c1c1c",
-              border: "1px solid #333",
-              borderRadius: 6,
-              fontSize: "0.75rem",
-              color: "#f5f5f5",
-            }}
-            labelStyle={{ color: "#b0b0b0" }}
-            formatter={(value, name) => {
-              if (value === null || value === undefined) return ["—", name];
-              return [`${value} min`, name];
+            cursor={{ fill: "rgba(255,255,255,0.04)" }}
+            content={({ active, payload, label }) => {
+              if (!active || !payload || payload.length === 0) return null;
+              return (
+                <div
+                  style={{
+                    background: "#1c1c1c",
+                    border: "1px solid #333",
+                    borderRadius: 6,
+                    fontSize: "0.75rem",
+                    padding: "8px 12px",
+                    lineHeight: 1.5,
+                  }}
+                >
+                  <div style={{ color: "#b0b0b0", marginBottom: 2 }}>{label}</div>
+                  {payload.map((entry) => {
+                    const color = entry.dataKey === "max" ? maxColor : avgColor;
+                    const v = entry.value;
+                    const display = v === null || v === undefined ? "—" : `${v} min`;
+                    return (
+                      <div key={String(entry.dataKey)} style={{ color }}>
+                        {entry.name} : {display}
+                      </div>
+                    );
+                  })}
+                </div>
+              );
             }}
           />
-          <Legend wrapperStyle={{ fontSize: "0.72rem", paddingTop: 4 }} />
-          <Bar name="Avg" dataKey="avg" fill={showFastLane ? "#ff4d8d" : "#4ade80"} radius={[3, 3, 0, 0]} isAnimationActive={false} />
-          <Bar name="Max" dataKey="max" fill={showFastLane ? "#3d0f22" : "#0a1a0d"} stroke={showFastLane ? "#ff4d8d" : "#22c55e"} strokeWidth={1} radius={[3, 3, 0, 0]} isAnimationActive={false} />
+          <Legend
+            wrapperStyle={{ fontSize: "0.72rem", paddingTop: 4 }}
+            formatter={(value) =>
+              value === "Max" ? <span style={{ color: maxColor }}>{value}</span> : value
+            }
+          />
+          <Bar name="Avg" dataKey="avg" fill={avgColor} radius={[3, 3, 0, 0]} isAnimationActive={false} />
+          <Bar name="Max" dataKey="max" fill={maxFill} stroke={maxColor} strokeWidth={1} radius={[3, 3, 0, 0]} isAnimationActive={false} />
         </BarChart>
       </ResponsiveContainer>
     </div>