task(E6b): seat assignment via canvas selection bridge

frontend/src/components/CanvasArea.tsx

@@ -155,6 +155,12 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
         }),
       });
 
+      // ── Task E6b: Selection-Bridge für GuestPanel (Stuhl-Zuweisung) ──
+      (window as unknown as { __v2GetSelection: unknown }).__v2GetSelection = () => {
+        const ids = Array.from(selectionEngine.getSelectedIds());
+        return { ids };
+      };
+
       // ── Task C3fin: Snap-Marks + Selection-Handles im Pixi-Overlay ──
       if (pixi && USE_PIXI_RENDERER) {
         // Snap-Marks bei Mausbewegung (wenn ein V2-Tool aktiv ist):

frontend/src/components/GuestPanel.tsx

@@ -4,7 +4,14 @@
  * wird per API gesetzt (Klick auf Stuhl im Canvas folgt in E6b).
  */
 import React, { useState, useEffect, useCallback } from 'react';
-import { listGuests, createGuest, deleteGuest, type Guest } from '../services/api';
+import { listGuests, createGuest, deleteGuest, updateGuest, type Guest } from '../services/api';
+
+/** E6b: Liest die erste Canvas-Auswahl (via CanvasArea-Bridge). */
+function getFirstSelectedId(): string | null {
+  const bridge = (window as unknown as { __v2GetSelection?: () => { ids: string[] } }).__v2GetSelection;
+  const ids = bridge?.().ids ?? [];
+  return ids[0] ?? null;
+}
 
 interface GuestPanelProps {
   token: string;
@@ -59,6 +66,24 @@ const GuestPanel: React.FC<GuestPanelProps> = ({ token, drawingId, onClose }) =>
     }
   };
 
+  const handleAssign = async (g: Guest) => {
+    try {
+      if (g.seat_element_id) {
+        await updateGuest(token, g.id, { seat_element_id: '' });
+      } else {
+        const seatId = getFirstSelectedId();
+        if (!seatId) {
+          setError('Erst einen Stuhl im Canvas auswählen.');
+          return;
+        }
+        await updateGuest(token, g.id, { seat_element_id: seatId });
+      }
+      await refresh();
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Fehler bei Zuweisung');
+    }
+  };
+
   const filtered = guests.filter((g) =>
     g.name.toLowerCase().includes(search.toLowerCase()) ||
     (g.email ?? '').toLowerCase().includes(search.toLowerCase())
@@ -122,8 +147,13 @@ const GuestPanel: React.FC<GuestPanelProps> = ({ token, drawingId, onClose }) =>
               {g.email && <div style={{ fontSize: 11, opacity: 0.6 }}>{g.email}</div>}
             </div>
             <div style={{ display: 'flex', gap: 6, alignItems: 'center' }}>
+              <button
+                onClick={() => void handleAssign(g)}
+                title={g.seat_element_id ? 'Zuweisung aufheben' : 'Erste Canvas-Auswahl als Sitzplatz zuweisen'}
+                style={{ opacity: g.seat_element_id ? 1 : 0.6 }}
+              >💺</button>
               {g.seat_element_id && (
-                <span style={{ fontSize: 11, opacity: 0.7 }} title="Sitzplatz zugewiesen">💺</span>
+                <span style={{ fontSize: 11, opacity: 0.7 }} title="Sitzplatz zugewiesen">✓</span>
               )}
               <button onClick={() => void handleDelete(g.id)} aria-label={`Lösche ${g.name}`}>🗑</button>
             </div>