Allow user to enqueue messages

[stanislavHamara]

Kapture.2026-01-15.at.16.19.33.mp4

Implements a message queue in the TUI that allows users to enqueue up to 5 messages while the agent is busy processing. Queued messages are automatically sent when the previous message finishes, providing a smoother workflow without losing user input.

Changes

Core queue logic (pkg/tui/page/chat/chat.go):

• Added queuedMessage struct and messageQueue field to chatPage
• handleSendMsg() – queues messages when agent is busy, processes immediately when idle
• processNextQueuedMessage() – pops and processes the next queued message (called when stream stops)
• handleClearQueue() – clears all queued messages with Ctrl+X
• syncQueueToSidebar() – syncs queue previews to sidebar display

Editor changes (pkg/tui/components/editor/editor.go):

• Removed working guards that blocked sending – now delegates queuing decision to chatPage

Key binding (pkg/tui/tui.go, pkg/tui/messages/messages.go):

• Added Ctrl+X binding to clear the message queue
• Added ClearQueueMsg message type

Visual feedback:

• Resize handle shows queue count: "Working… (3 queued)"
• Sidebar displays "Queue (N)" section with truncated message previews
• Notifications inform users: "Message queued (2 waiting) · Ctrl+X to clear"

Sidebar (pkg/tui/components/sidebar/sidebar.go):

• Added SetQueuedMessages() method and queueSection() renderer
• Queue section shows tree-style list of pending messages with clear hint

Behavior

• Messages sent while agent is busy are queued (max 5)
• When agent finishes, next queued message auto-starts
• Esc cancels current stream but preserves the queue
• Ctrl+X clears all queued messages
• Queue full → warning notification, message rejected

Tests

• pkg/tui/page/chat/queue_test.go – flow tests for queueing, rejection, clearing, FIFO order
• pkg/tui/components/sidebar/queue_test.go – sidebar queue section renderingWIP