feat(FN-681): add multi-tab terminal support

- Implemented multi-tab support in TerminalModal component
- Each tab maintains independent WebSocket connection and xterm instance
- Tab management: create, switch, close tabs with keyboard shortcuts (Ctrl+Tab)
- Added Plus button to create new tabs
- Added close button on tabs (except last remaining tab)
- Updated keyboard shortcuts text in status bar
- Connection status indicator per tab
- Per-tab scrollback buffers preserved when switching tabs
- Auto-cleanup of all sessions when modal closes
- Added comprehensive tests for multi-tab functionality

packages/core/src/store.ts

@@ -2012,45 +2012,13 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
   }
 
   /**
-   * Add a steering comment to a task (legacy support).
+   * Add a steering comment to a task.
    * Steering comments are injected into the AI execution context.
    * @deprecated Use addComment instead - comments are now unified
    */
   async addSteeringComment(id: string, text: string, author: "user" | "agent" = "user"): Promise<Task> {
-    return this.withTaskLock(id, async () => {
-      const dir = this.taskDir(id);
-      const task = await this.readTaskJson(dir);
-
-      // Initialize steeringComments array if missing
-      if (!task.steeringComments) {
-        task.steeringComments = [];
-      }
-
-      const comment: import("./types.js").SteeringComment = {
-        id: `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
-        text,
-        createdAt: new Date().toISOString(),
-        author,
-      };
-
-      task.steeringComments.push(comment);
-      task.updatedAt = new Date().toISOString();
-
-      // Initialize log array if missing (for legacy tasks)
-      if (!task.log) {
-        task.log = [];
-      }
-      task.log.push({
-        timestamp: task.updatedAt,
-        action: `Steering comment added by ${author}`,
-      });
-
-      await this.atomicWriteTaskJson(dir, task);
-      if (this.watcher) this.taskCache.set(id, { ...task });
-
-      this.emit("task:updated", task);
-      return task;
-    });
+    // Delegates to addComment for unified comment storage
+    return this.addComment(id, text, author);
   }
 
   async updateTaskComment(id: string, commentId: string, text: string): Promise<Task> {