fix(desktop): DeerFlow UI — ChatArea refactor + ai-elements + dead CSS cleanup

ChatArea retry button uses setInput instead of direct sendToGateway,
fix bootstrap spinner stuck for non-logged-in users,
remove dead CSS (aurora-title/sidebar-open/quick-action-chips),
add ai components (ReasoningBlock/StreamingText/ChatMode/ModelSelector/TaskProgress),
add ClassroomPlayer + ResizableChatLayout + artifact panel

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src-tauri/src/classroom_commands/mod.rs

@@ -0,0 +1,41 @@
+//! Classroom generation and interaction commands
+//!
+//! Tauri commands for the OpenMAIC-style interactive classroom:
+//! - Generate classroom (4-stage pipeline with progress events)
+//! - Multi-agent chat
+//! - Export (HTML/Markdown/JSON)
+
+use std::sync::Arc;
+use tokio::sync::Mutex;
+use zclaw_kernel::generation::Classroom;
+
+pub mod chat;
+pub mod export;
+pub mod generate;
+
+// ---------------------------------------------------------------------------
+// Shared state types
+// ---------------------------------------------------------------------------
+
+/// In-memory classroom store: classroom_id → Classroom
+pub type ClassroomStore = Arc<Mutex<std::collections::HashMap<String, Classroom>>>;
+
+/// Active generation tasks: topic → progress
+pub type GenerationTasks = Arc<Mutex<std::collections::HashMap<String, zclaw_kernel::generation::GenerationProgress>>>;
+
+// Re-export chat state type
+// Re-export chat state type — used by lib.rs to construct managed state
+#[allow(unused_imports)]
+pub use chat::ChatStore;
+
+// ---------------------------------------------------------------------------
+// State constructors
+// ---------------------------------------------------------------------------
+
+pub fn create_classroom_state() -> ClassroomStore {
+    Arc::new(Mutex::new(std::collections::HashMap::new()))
+}
+
+pub fn create_generation_tasks() -> GenerationTasks {
+    Arc::new(Mutex::new(std::collections::HashMap::new()))
+}