agent: Remove unused `agent: chat mode` command palette action (#29741)

Danilo Leal and Joseph T. Lyons created

We weren't using this one anymore. We used to use it for the switch that
toggled tools on, which doesn't exist anymore.

Release Notes:

- N/A

---------

Co-authored-by: Joseph T. Lyons <josephtlyons@gmail.com>

Change summary

assets/keymaps/default-linux.json  | 1 -
assets/keymaps/default-macos.json  | 1 -
crates/agent/src/assistant.rs      | 1 -
crates/agent/src/message_editor.rs | 7 +------
4 files changed, 1 insertion(+), 9 deletions(-)

Detailed changes

assets/keymaps/default-linux.json 🔗

@@ -248,7 +248,6 @@
       "ctrl-shift-o": "agent::ToggleNavigationMenu",
       "ctrl-shift-i": "agent::ToggleOptionsMenu",
       "shift-escape": "agent::ExpandMessageEditor",
-      "ctrl-e": "agent::ChatMode",
       "ctrl-alt-e": "agent::RemoveAllContext"
     }
   },

assets/keymaps/default-macos.json 🔗

@@ -293,7 +293,6 @@
       "cmd-shift-o": "agent::ToggleNavigationMenu",
       "cmd-shift-i": "agent::ToggleOptionsMenu",
       "shift-escape": "agent::ExpandMessageEditor",
-      "cmd-e": "agent::ChatMode",
       "cmd-alt-e": "agent::RemoveAllContext"
     }
   },

crates/agent/src/assistant.rs 🔗

@@ -62,7 +62,6 @@ actions!(
         AddContextServer,
         RemoveSelectedThread,
         Chat,
-        ChatMode,
         CycleNextInlineAssist,
         CyclePreviousInlineAssist,
         FocusUp,

crates/agent/src/message_editor.rs 🔗

@@ -42,7 +42,7 @@ use crate::profile_selector::ProfileSelector;
 use crate::thread::{Thread, TokenUsageRatio};
 use crate::thread_store::ThreadStore;
 use crate::{
-    AgentDiff, Chat, ChatMode, ExpandMessageEditor, NewThread, OpenAgentDiff, RemoveAllContext,
+    AgentDiff, Chat, ExpandMessageEditor, NewThread, OpenAgentDiff, RemoveAllContext,
     ToggleContextPicker, ToggleProfileSelector,
 };
 
@@ -206,10 +206,6 @@ impl MessageEditor {
         &self.context_store
     }
 
-    fn toggle_chat_mode(&mut self, _: &ChatMode, _window: &mut Window, cx: &mut Context<Self>) {
-        cx.notify();
-    }
-
     pub fn expand_message_editor(
         &mut self,
         _: &ExpandMessageEditor,
@@ -499,7 +495,6 @@ impl MessageEditor {
             .on_action(cx.listener(Self::toggle_context_picker))
             .on_action(cx.listener(Self::remove_all_context))
             .on_action(cx.listener(Self::move_up))
-            .on_action(cx.listener(Self::toggle_chat_mode))
             .on_action(cx.listener(Self::expand_message_editor))
             .capture_action(cx.listener(Self::paste))
             .gap_2()