fix: isolate delivered agent chats by project

src/pages/Chat/CodingChatPanel.tsx

@@ -969,7 +969,7 @@ export function CodingChatPanel({
             onPointerMove={(event) => { if (event.currentTarget.hasPointerCapture(event.pointerId)) setConsultationWidth(Math.max(320, Math.min(640, window.innerWidth - event.clientX))); }}
             onPointerUp={(event) => { if (event.currentTarget.hasPointerCapture(event.pointerId)) event.currentTarget.releasePointerCapture(event.pointerId); }}
             onKeyDown={(event) => { if (event.key === 'ArrowLeft' || event.key === 'ArrowRight') { event.preventDefault(); setConsultationWidth((width) => Math.max(320, Math.min(640, width + (event.key === 'ArrowLeft' ? 20 : -20)))); } }} />
-          <TeacherChatPanel key={`${account}:${teacherCompanion.selectedAgent?.teacher_id ?? activeProject.id}`}
+          <TeacherChatPanel key={`${account}:${activeProject.id}:${teacherCompanion.selectedAgent?.teacher_id ?? 'legacy'}`}
             projectId={activeProject.id} projectName={activeProject.name} sourceId={targetConversationId ?? ''}
             selectedAgent={teacherCompanion.selectedAgent}
             catalogState={teacherCompanion.catalogState}