Allow adding conference speakers after creation on details page.

Hosts can assign team speakers and invite panelists by email from the
conference show page, with presenter refs synced to live sessions.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/Feature/MeetWebTest.php

@@ -723,6 +723,55 @@ class MeetWebTest extends TestCase
             ->assertSee('NextGen Summit');
     }
 
+    public function test_host_can_add_speakers_after_conference_created(): void
+    {
+        $speaker = User::create([
+            'public_id' => 'speaker-user-001',
+            'name' => 'Keynote Speaker',
+            'email' => 'speaker@example.com',
+        ]);
+
+        Member::create([
+            'owner_ref' => $this->user->public_id,
+            'organization_id' => $this->organization->id,
+            'user_ref' => $speaker->public_id,
+            'role' => 'member',
+        ]);
+
+        $room = Room::create([
+            'owner_ref' => $this->user->public_id,
+            'organization_id' => $this->organization->id,
+            'host_user_ref' => $this->user->public_id,
+            'title' => 'Product launch',
+            'type' => 'town_hall',
+            'status' => 'scheduled',
+            'scheduled_at' => now()->addDay(),
+            'timezone' => 'UTC',
+            'settings' => array_merge(config('meet.default_settings'), [
+                'green_room' => true,
+                'stage_mode' => true,
+                'presenter_refs' => [],
+            ]),
+        ]);
+
+        $this->actingAs($this->user)
+            ->post(route('meet.conferences.speakers.update', $room), [
+                'presenter_refs' => [$speaker->public_id],
+                'invite_emails' => 'guest-speaker@example.com',
+            ])
+            ->assertRedirect(route('meet.conferences.show', $room))
+            ->assertSessionHas('success');
+
+        $room->refresh();
+        $this->assertContains($speaker->public_id, $room->setting('presenter_refs'));
+
+        $this->assertDatabaseHas('meet_invitations', [
+            'room_id' => $room->id,
+            'email' => 'guest-speaker@example.com',
+            'role' => 'panelist',
+        ]);
+    }
+
     public function test_host_can_create_space_room(): void
     {
         $this->actingAs($this->user)