Übersicht: Schüler-Drilldown (Klick → aktuelle Simulationsparameter, cockpit-artig)

live.php: student_runs=<id> liefert letzte Läufe (detail_json = Parameter) + Live-State
+ Recency. teacher.html: Klick auf Triage-Zeile öffnet Modal mit Erfolg/Zuletzt, Live-
Tätigkeit und den letzten Durchläufen samt geparsten Sim-Parametern (CO₂, Fehlklicks …).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

App/php/api/live.php

@@ -443,6 +443,56 @@ if ($method === 'GET') {
         ]);
     }
 
+    // ===================================================================
+    // SCHÜLER-DRILLDOWN — student_runs=<id>
+    // Aktuelle Sim-Parameter: letzte Läufe (detail_json) + Live-State + Recency.
+    // ===================================================================
+    if (isset($_GET['student_runs'])) {
+        $studentId = (int)$_GET['student_runs'];
+        $stu = $db->fetchOne(
+            'SELECT s.id, s.display_name, s.username, s.emoji_avatar
+               FROM students s JOIN classes c ON c.id = s.class_id
+              WHERE s.id = ? AND c.teacher_id = ?',
+            [$studentId, $teacherId]);
+        if (!$stu) Response::error('Schüler:in nicht gefunden', 404);
+
+        $runs = $db->fetchAll(
+            'SELECT module_id, score, duration_sec, detail_json, completed_at
+               FROM student_results WHERE student_id = ? ORDER BY completed_at DESC LIMIT 12',
+            [$studentId]);
+        $live = $db->fetchOne(
+            'SELECT module_id, state_json, UNIX_TIMESTAMP(last_seen) AS last_seen_ts
+               FROM live_sessions WHERE student_id = ? ORDER BY last_seen DESC LIMIT 1',
+            [$studentId]);
+        $active = $live && ((int)$live['last_seen_ts'] >= time() - LIVE_ACTIVE_WINDOW_SEC);
+
+        // Recency-Kennzahlen aus den Läufen
+        $recentScores = []; $daysSince = null;
+        foreach ($runs as $i => $r) {
+            if ($daysSince === null && $r['completed_at']) $daysSince = (int)floor((time() - strtotime($r['completed_at'])) / 86400);
+            if ($i < 3 && $r['score'] !== null) $recentScores[] = (float)$r['score'];
+        }
+        $recentErfolg = $recentScores ? (int)round(array_sum($recentScores) / count($recentScores)) : null;
+
+        Response::ok([
+            'studentId'    => $studentId,
+            'displayName'  => $stu['display_name'] ?: $stu['username'],
+            'emoji'        => $stu['emoji_avatar'] ?: '🧑‍🎓',
+            'recentErfolg' => $recentErfolg,
+            'daysSince'    => $daysSince,
+            'live'         => $active ? ['moduleId' => $live['module_id'], 'state' => json_decode($live['state_json'], true)] : null,
+            'runs'         => array_map(function ($r) {
+                return [
+                    'moduleId'    => $r['module_id'],
+                    'score'       => $r['score'] !== null ? (float)$r['score'] : null,
+                    'durationSec' => (int)$r['duration_sec'],
+                    'completedAt' => $r['completed_at'],
+                    'params'      => $r['detail_json'] ? json_decode($r['detail_json'], true) : null,
+                ];
+            }, $runs),
+        ]);
+    }
+
     // Klassen-Liste: alle aktiven Sessions
     $classId = (int)($_GET['class_id'] ?? 0);
     if (!$classId) Response::error('class_id erforderlich');