fix: custom tooltip with inline fill color, dynamic subtitle

- Replace ChartTooltipContent with custom tooltip that reads fill
  directly from payload — guaranteed to show the slice color
- Subtitle adapts: shows 'current and previous period' only when
  previous period data exists, otherwise 'rage vs dead breakdown'
- Filter out zero-count slices from chart data

components/behavior/FrustrationTrend.tsx

@@ -1,12 +1,10 @@
 'use client'
 
 import { TrendUp } from '@phosphor-icons/react'
-import { Pie, PieChart } from 'recharts'
+import { Pie, PieChart, Tooltip } from 'recharts'
 
 import {
   ChartContainer,
-  ChartTooltip,
-  ChartTooltipContent,
   type ChartConfig,
 } from '@/components/charts'
 import type { FrustrationSummary } from '@/lib/api/stats'
@@ -30,6 +28,13 @@ function SkeletonCard() {
   )
 }
 
+const LABELS: Record<string, string> = {
+  rage_clicks: 'Rage Clicks',
+  dead_clicks: 'Dead Clicks',
+  prev_rage_clicks: 'Prev Rage Clicks',
+  prev_dead_clicks: 'Prev Dead Clicks',
+}
+
 const COLORS = {
   rage_clicks: 'rgba(253, 94, 15, 0.7)',
   dead_clicks: 'rgba(180, 83, 9, 0.7)',
@@ -38,27 +43,32 @@ const COLORS = {
 } as const
 
 const chartConfig = {
-  count: {
-    label: 'Count',
-  },
-  rage_clicks: {
-    label: 'Rage Clicks',
-    color: COLORS.rage_clicks,
-  },
-  dead_clicks: {
-    label: 'Dead Clicks',
-    color: COLORS.dead_clicks,
-  },
-  prev_rage_clicks: {
-    label: 'Prev Rage Clicks',
-    color: COLORS.prev_rage_clicks,
-  },
-  prev_dead_clicks: {
-    label: 'Prev Dead Clicks',
-    color: COLORS.prev_dead_clicks,
-  },
+  count: { label: 'Count' },
+  rage_clicks: { label: 'Rage Clicks', color: COLORS.rage_clicks },
+  dead_clicks: { label: 'Dead Clicks', color: COLORS.dead_clicks },
+  prev_rage_clicks: { label: 'Prev Rage Clicks', color: COLORS.prev_rage_clicks },
+  prev_dead_clicks: { label: 'Prev Dead Clicks', color: COLORS.prev_dead_clicks },
 } satisfies ChartConfig
 
+function CustomTooltip({ active, payload }: { active?: boolean; payload?: Array<{ payload: { type: string; count: number; fill: string } }> }) {
+  if (!active || !payload?.length) return null
+  const item = payload[0].payload
+  return (
+    <div className="flex items-center gap-2 rounded-lg border border-neutral-200 dark:border-neutral-700 bg-white dark:bg-neutral-800 px-2.5 py-1.5 text-xs shadow-xl">
+      <div
+        className="h-2.5 w-2.5 shrink-0 rounded-full"
+        style={{ backgroundColor: item.fill }}
+      />
+      <span className="text-neutral-500 dark:text-neutral-400">
+        {LABELS[item.type] ?? item.type}
+      </span>
+      <span className="font-mono font-medium tabular-nums text-neutral-900 dark:text-neutral-50">
+        {item.count.toLocaleString()}
+      </span>
+    </div>
+  )
+}
+
 export default function FrustrationTrend({ summary, loading }: FrustrationTrendProps) {
   if (loading || !summary) return <SkeletonCard />
 
@@ -70,13 +80,14 @@ export default function FrustrationTrend({ summary, loading }: FrustrationTrendP
   const totalChange = totalPrevious > 0
     ? Math.round(((totalCurrent - totalPrevious) / totalPrevious) * 100)
     : null
+  const hasPrevious = totalPrevious > 0
 
   const chartData = [
     { type: 'rage_clicks', count: summary.rage_clicks, fill: COLORS.rage_clicks },
     { type: 'dead_clicks', count: summary.dead_clicks, fill: COLORS.dead_clicks },
     { type: 'prev_rage_clicks', count: summary.prev_rage_clicks, fill: COLORS.prev_rage_clicks },
     { type: 'prev_dead_clicks', count: summary.prev_dead_clicks, fill: COLORS.prev_dead_clicks },
-  ]
+  ].filter(d => d.count > 0)
 
   if (!hasData) {
     return (
@@ -87,7 +98,7 @@ export default function FrustrationTrend({ summary, loading }: FrustrationTrendP
           </h3>
         </div>
         <p className="text-sm text-neutral-500 dark:text-neutral-400 mb-4">
-          Current vs. previous period comparison
+          Rage vs. dead click breakdown
         </p>
         <div className="flex-1 min-h-[270px] flex flex-col items-center justify-center text-center px-6 py-8 gap-4">
           <div className="rounded-full bg-neutral-100 dark:bg-neutral-800 p-4">
@@ -97,7 +108,7 @@ export default function FrustrationTrend({ summary, loading }: FrustrationTrendP
             No trend data yet
           </h4>
           <p className="text-sm text-neutral-500 dark:text-neutral-400 max-w-md">
-            Frustration trend data will appear here once rage clicks or dead clicks are detected across periods.
+            Frustration trend data will appear here once rage clicks or dead clicks are detected on your site.
           </p>
         </div>
       </div>
@@ -112,7 +123,9 @@ export default function FrustrationTrend({ summary, loading }: FrustrationTrendP
         </h3>
       </div>
       <p className="text-sm text-neutral-500 dark:text-neutral-400 mb-4">
-        Rage and dead clicks split across current and previous period
+        {hasPrevious
+          ? 'Rage and dead clicks split across current and previous period'
+          : 'Rage vs. dead click breakdown'}
       </p>
 
       <div className="flex-1">
@@ -121,9 +134,9 @@ export default function FrustrationTrend({ summary, loading }: FrustrationTrendP
           className="mx-auto aspect-square max-h-[250px]"
         >
           <PieChart>
-            <ChartTooltip
+            <Tooltip
               cursor={false}
-              content={<ChartTooltipContent hideLabel />}
+              content={<CustomTooltip />}
             />
             <Pie
               data={chartData}