fix: subagent unique ID matching + AgentState serialization + pre-existing TS errors

- S-3: Thread task_id (UUID) through all 6 layers (LoopEvent → StreamChatEvent → kernel-types → gateway-client → streamStore) so subtasks are matched by ID, not description string
- AgentState: Add #[serde(rename_all = "lowercase")] to fix PascalCase serialization ("Running" → "running"), update frontend matcher
- S-1: Remove unused onClose prop from ArtifactPanel + ChatArea call site
- Fix hooks/index.ts: remove orphaned useAutomationEvents re-exports (module deleted)
- Fix types/index.ts: remove orphaned automation type/value re-exports (module deleted)
- Fix ChatArea.tsx: framer-motion 12 + React 19 type compat — use createElement + explicit any return type to avoid unknown-in-JSX-child error

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

desktop/src-tauri/src/kernel_commands/chat.rs

@@ -49,7 +49,7 @@ pub enum StreamChatEvent {
     ThinkingDelta { delta: String },
     ToolStart { name: String, input: serde_json::Value },
     ToolEnd { name: String, output: serde_json::Value },
-    SubtaskStatus { description: String, status: String, detail: Option<String> },
+    SubtaskStatus { task_id: String, description: String, status: String, detail: Option<String> },
     IterationStart { iteration: usize, max_iterations: usize },
     HandStart { name: String, params: serde_json::Value },
     HandEnd { name: String, result: serde_json::Value },
@@ -341,9 +341,10 @@ pub async fn agent_chat_stream(
                                 StreamChatEvent::ToolEnd { name: name.clone(), output: output.clone() }
                             }
                         }
-                        LoopEvent::SubtaskStatus { description, status, detail } => {
-                            tracing::debug!("[agent_chat_stream] SubtaskStatus: {} - {}", description, status);
+                        LoopEvent::SubtaskStatus { task_id, description, status, detail } => {
+                            tracing::debug!("[agent_chat_stream] SubtaskStatus: {} - {} (id={})", description, status, task_id);
                             StreamChatEvent::SubtaskStatus {
+                                task_id: task_id.clone(),
                                 description: description.clone(),
                                 status: status.clone(),
                                 detail: detail.clone(),