Improve Linux terminal keymap and context menu (#16845)

Follow-up https://github.com/zed-industries/zed/pull/16085 that fixes
the search deploy to be actually a part of the terminal-related
bindings.

Part of https://github.com/zed-industries/zed/issues/16839

Also 

* fixes few other bindings to use `shift` and avoid conflicts with the
existing key bindings.
* adds terminal inline assist to the context menu and makes both the
menu and the button to dynamically adjust to `assist.enabled` settings
change

It is still unclear to me, why certain labels for certain bindings are
wrong (it's still showing `ctrl-w` for closing the terminal tab, and
`shift-insert` instead of `ctrl-shift-v` for Paste, while Insert is near
and has a `ctrl-shift-c` binding shown) but at least the keys work now.

Release notes: 
- Improved Linux terminal keymap and context menu

crates/terminal_view/src/terminal_panel.rs

@@ -33,6 +33,7 @@ use workspace::{
 };
 
 use anyhow::Result;
+use zed_actions::InlineAssist;
 
 const TERMINAL_PANEL_KEY: &str = "TerminalPanel";
 
@@ -68,7 +69,8 @@ pub struct TerminalPanel {
     _subscriptions: Vec<Subscription>,
     deferred_tasks: HashMap<TaskId, Task<()>>,
     enabled: bool,
-    additional_tab_bar_buttons: Vec<AnyView>,
+    assistant_enabled: bool,
+    assistant_tab_bar_button: Option<AnyView>,
 }
 
 impl TerminalPanel {
@@ -154,23 +156,25 @@ impl TerminalPanel {
             deferred_tasks: HashMap::default(),
             _subscriptions: subscriptions,
             enabled,
-            additional_tab_bar_buttons: Vec::new(),
+            assistant_enabled: false,
+            assistant_tab_bar_button: None,
         };
         this.apply_tab_bar_buttons(cx);
         this
     }
 
-    pub fn register_tab_bar_button(
-        &mut self,
-        button: impl Into<AnyView>,
-        cx: &mut ViewContext<Self>,
-    ) {
-        self.additional_tab_bar_buttons.push(button.into());
+    pub fn asssistant_enabled(&mut self, enabled: bool, cx: &mut ViewContext<Self>) {
+        self.assistant_enabled = enabled;
+        if enabled {
+            self.assistant_tab_bar_button = Some(cx.new_view(|_| InlineAssistTabBarButton).into());
+        } else {
+            self.assistant_tab_bar_button = None;
+        }
         self.apply_tab_bar_buttons(cx);
     }
 
     fn apply_tab_bar_buttons(&self, cx: &mut ViewContext<Self>) {
-        let additional_buttons = self.additional_tab_bar_buttons.clone();
+        let assistant_tab_bar_button = self.assistant_tab_bar_button.clone();
         self.pane.update(cx, |pane, cx| {
             pane.set_render_tab_bar_buttons(cx, move |pane, cx| {
                 if !pane.has_focus(cx) && !pane.context_menu_focused(cx) {
@@ -179,7 +183,7 @@ impl TerminalPanel {
                 let focus_handle = pane.focus_handle(cx);
                 let right_children = h_flex()
                     .gap_2()
-                    .children(additional_buttons.clone())
+                    .children(assistant_tab_bar_button.clone())
                     .child(
                         PopoverMenu::new("terminal-tab-bar-popover-menu")
                             .trigger(
@@ -686,6 +690,10 @@ impl TerminalPanel {
     fn has_no_terminals(&self, cx: &WindowContext) -> bool {
         self.pane.read(cx).items_len() == 0 && self.pending_terminals_to_add == 0
     }
+
+    pub fn assistant_enabled(&self) -> bool {
+        self.assistant_enabled
+    }
 }
 
 async fn wait_for_terminals_tasks(
@@ -851,6 +859,19 @@ impl Panel for TerminalPanel {
     }
 }
 
+struct InlineAssistTabBarButton;
+
+impl Render for InlineAssistTabBarButton {
+    fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
+        IconButton::new("terminal_inline_assistant", IconName::ZedAssistant)
+            .icon_size(IconSize::Small)
+            .on_click(cx.listener(|_, _, cx| {
+                cx.dispatch_action(InlineAssist::default().boxed_clone());
+            }))
+            .tooltip(move |cx| Tooltip::for_action("Inline Assist", &InlineAssist::default(), cx))
+    }
+}
+
 #[derive(Serialize, Deserialize)]
 struct SerializedTerminalPanel {
     items: Vec<u64>,