Agent chat: queue messages while the agent works, Send now, Stop, New chat, and a model picker (#1566, #1571) (#1566)

Thanks @bherbruck.

docs/agent-chat.md

@@ -41,7 +41,28 @@ when you send a message or press **Connect**.
   unfold it. **Close** (×) hides the panel. Neither stops the agent; **Stop** does.
 - **The agent switcher** under the title picks the agent for this conversation; switching stops
   the one running. Next to it, when the agent has modes of its own (Claude Code has *Default*,
-  *Accept Edits*, *Plan*…), a second drop-down sets the agent's mode.
+  *Accept Edits*, *Plan*…), a second drop-down sets the agent's mode. When the agent reports its models (an ACP agent's
+  model list, or an endpoint's `/models`), a model drop-down shows the one in use and changes it;
+  SolidCraft remembers the last choice for each agent and puts it back on the next session. An
+  endpoint's agent also keeps it as its default model. An agent that reports no models shows no
+  drop-down.
+
+## Typing while the agent works
+
+The input stays enabled during a turn. **Enter** queues the message: it shows in the conversation
+as a **Queued** bubble that you can **Edit** or remove (×) until it is sent. Several queued
+messages go as one prompt, in order, when the turn ends normally.
+
+- **Send now** (on the bubble, or **Ctrl+Enter** / **Cmd+Enter** in the input) stops the current
+  step, waits for the agent to say it stopped, then sends the queue as the next prompt, with a
+  short note that the agent's previous step was interrupted. What the interrupted message changed
+  undoes as one step, like any other message.
+- **Stop** (the square next to the input, or **Esc** in the input) stops the agent and keeps
+  the queue: the bubbles wait for **Send**.
+- **New chat** (the header button, **Ctrl+Shift+L** / **Cmd+Shift+L** with the chat focused)
+  stops what runs, clears the conversation and the queue and starts a fresh session on the same
+  agent, keeping the agent and its mode. It asks first when a message is running or queued. The
+  design's undo history is untouched.
 
 ## Agents
 

docs/control-protocol.md

@@ -147,7 +147,7 @@ labels; `prefs:measure_axis_distances` identifies the checkbox.
 | `ui.capture` | `action?`: `capture`, `revert`, `cancel` | answers the Capture Position question (asked when a command starts or the design is saved while components were moved without capturing); without `action`, what waits |
 | `ui.window` | `action`: minimize, maximize, restore, toggle, close | what the title bar's caption buttons do (on Windows and Linux the application bar is the title bar); close asks about unsaved designs first |
 | `ui.agent_cursor` | `show` (bool), `speed`: a number from 1 to 5 (times the normal speed) or `"instant"` (no animation: the command runs at once and the pointer jumps to where it acted), `follow_camera` (bool); all optional | the settings. While the cursor is shown, `engine.execute` first glides to the command's toolbar button and to each pick, then runs and replies; later requests wait their turn. `"animate": false` on a call skips it |
-| `ui.agent_chat` | `features?`, `toolbar_button?`, `permissions?` (`ask`, `edits`, `all`), `add_agent?` ({`name`, `kind`: `acp` or `api`, `command` or `base_url` + `model`}; no keys), `default_agent?`, `agent?` (the conversation's agent, by id), `mode?` (the agent's own mode), `open?`, `side?` (`left`, `right`), `minimized?`, `width?`, `picker?`, `refresh?`, `connect?`, `stop?`, `send?`: text, `attach_view?`, `permission?`: an option id or `"cancel"` (the newest question of the agent's own), `approve?`: true, false or `"always"` (the oldest request held for Allow/Deny), `cancel?`, `undo?` (the last message's changes) | the chat's state: `features`, `agents` (found and added), `currentAgent`, `state` (off, starting, ready, busy, auth, exited), `agent`, `modes`, `mode`, `authMethods`, `toolsPort`, `pid`, `waiting`, `turn`, `detection` and the conversation (`items`). With `features` off only the settings apply. Desktop only; see [Agent chat](agent-chat.md) |
+| `ui.agent_chat` | `features?`, `toolbar_button?`, `permissions?` (`ask`, `edits`, `all`), `add_agent?` ({`name`, `kind`: `acp` or `api`, `command` or `base_url` + `model`}; no keys), `default_agent?`, `agent?` (the conversation's agent, by id), `mode?` (the agent's own mode), `model?` (one of its models), `open?`, `side?` (`left`, `right`), `minimized?`, `width?`, `picker?`, `refresh?`, `connect?`, `stop?`, `send?`: text, `attach_view?`, `permission?`: an option id or `"cancel"` (the newest question of the agent's own), `approve?`: true, false or `"always"` (the oldest request held for Allow/Deny), `cancel?` (Stop: the queue stays), `send_now?` (stop the running step, then send the queued messages), `remove_pending?` (index), `new_chat?` (clear the chat, new session), `undo?` (the last message's changes) | the chat's state: `features`, `agents` (found and added), `currentAgent`, `state` (off, starting, ready, busy, auth, exited), `agent`, `modes`, `mode`, `models`, `model`, `authMethods`, `toolsPort`, `pid`, `waiting`, `turn`, `pending` (queued messages), `stopped`, `detection` and the conversation (`items`). With `features` off only the settings apply. Desktop only; see [Agent chat](agent-chat.md) |
 | `ui.resize` | `width`, `height` | |
 | `app.quit` | `force?` (quit without asking about unsaved designs) | `quitting` (the window closes), `asking` (a "save changes?" prompt is open) |