fix: smart CBT result/back routing for DPPs and add Test Type selector in Admin panel

src/app/admin/tests/page.tsx

@@ -41,6 +41,7 @@ export default function AdminTestsPage() {
   
   // Upload Form State
   const [title, setTitle] = useState("")
+  const [testType, setTestType] = useState("CBT")
   const [examPattern, setExamPattern] = useState("JEE_Main")
   const [timeLimit, setTimeLimit] = useState("180")
   const [scheduledDate, setScheduledDate] = useState<Date | null>(null)
@@ -180,6 +181,7 @@ export default function AdminTestsPage() {
     
     const payload = {
       title,
+      type: testType,
       exam_pattern: examPattern,
       time_limit: parseInt(timeLimit),
       admin_id: userId,
@@ -236,6 +238,27 @@ export default function AdminTestsPage() {
                 <label className="text-sm font-medium">Test Title</label>
                 <Input required value={title} onChange={e => setTitle(e.target.value)} placeholder="e.g. JEE Main Mock Test 1" />
               </div>
+
+              {/* TEST TYPE — KEY DIFFERENTIATOR */}
+              <div className="space-y-2">
+                <label className="text-sm font-medium flex items-center gap-2">
+                  Test Type
+                  <span className="text-[10px] text-muted-foreground font-normal">(determines which section it appears in)</span>
+                </label>
+                <select
+                  className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
+                  value={testType}
+                  onChange={(e) => setTestType(e.target.value)}
+                >
+                  <option value="CBT">🎯 CBT Mock Test — appears in Mock Tests section</option>
+                  <option value="DPS">📋 DPP (Daily Practice) — appears in PrepPilot AI section</option>
+                </select>
+                <p className="text-[11px] text-muted-foreground">
+                  {testType === 'CBT'
+                    ? '✅ This will appear under Dashboard → Mock Tests (CBT) for students to attempt.'
+                    : '✅ This will appear under AI Coach → PrepPilot AI as a DPP with full CBT interface.'}
+                </p>
+              </div>
               
               <div className="space-y-2">
                 <label className="text-sm font-medium">Exam Pattern</label>