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/quick_action_bar/src/quick_action_bar.rs

@@ -1,5 +1,5 @@
 use assistant::assistant_settings::AssistantSettings;
-use assistant::{AssistantPanel, InlineAssist};
+use assistant::AssistantPanel;
 use editor::actions::{
     AddSelectionAbove, AddSelectionBelow, DuplicateLineDown, GoToDiagnostic, GoToHunk,
     GoToPrevDiagnostic, GoToPrevHunk, MoveLineDown, MoveLineUp, SelectAll, SelectLargerSyntaxNode,
@@ -20,6 +20,7 @@ use ui::{
 use workspace::{
     item::ItemHandle, ToolbarItemEvent, ToolbarItemLocation, ToolbarItemView, Workspace,
 };
+use zed_actions::InlineAssist;
 
 mod repl_menu;
 mod toggle_markdown_preview;