Remove Mistake Analyzer and rename Mistake Heatmap to Mastery Map

src/components/AI/MistakeHeatmap.tsx

@@ -1,4 +1,4 @@
-"use client"
+"use client"
 
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
 import { Badge } from "@/components/ui/badge"
@@ -38,7 +38,7 @@ export function MistakeHeatmap() {
       <CardHeader className="pb-4">
         <div className="flex items-center justify-between">
           <CardTitle className="text-xl flex items-center gap-2">
-            <Flame className="text-orange-500" /> Mistake Heatmap
+            <Flame className="text-orange-500" /> Mastery Map
             <Badge variant="outline" className="border-[var(--cyan-ai-30)] text-[var(--cyan-ai)] bg-[var(--cyan-ai-10)] rounded-md text-[10px] uppercase font-bold ml-2 hidden sm:flex">AI Coach</Badge>
           </CardTitle>
           <Info size={16} className="text-muted-foreground" />