workspace: Implement Extended Terminal Option (#26211)

Closes #10211 
Closes #7575 

Screenshot of feature:
![Screenshot 2025-03-06 at 1 08
13 PM](https://github.com/user-attachments/assets/73cc4519-248b-4264-9ce8-42d0980cf73c)

Screenshot of proposed menu:
![Screenshot 2025-03-06 at 1 14
30 PM](https://github.com/user-attachments/assets/efc7c18a-a2a5-491f-b3e5-5ed181f23906)

Screenshot of proposed menu closed:
![Screenshot 2025-03-06 at 1 14
57 PM](https://github.com/user-attachments/assets/0b42829c-abe3-48aa-9b81-30a0aeeac8fd)

Release Notes:

- Configuration of bottom_dock_layout in settings.json
- Layout Mode button in Title Bar
- 4 different layout modes for the bottom dock: contained (default),
full (extends below both docks), left-aligned, right-aligned (extends
only below the respective dock)

---------

Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>

crates/workspace/src/workspace_settings.rs

@@ -10,6 +10,7 @@ use settings::{Settings, SettingsSources};
 #[derive(Deserialize)]
 pub struct WorkspaceSettings {
     pub active_pane_modifiers: ActivePanelModifiers,
+    pub bottom_dock_layout: BottomDockLayout,
     pub pane_split_direction_horizontal: PaneSplitDirectionHorizontal,
     pub pane_split_direction_vertical: PaneSplitDirectionVertical,
     pub centered_layout: CenteredLayoutSettings,
@@ -71,6 +72,20 @@ pub struct ActivePanelModifiers {
     pub inactive_opacity: Option<f32>,
 }
 
+#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize, PartialEq, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum BottomDockLayout {
+    /// Contained between the left and right docks
+    #[default]
+    Contained,
+    /// Takes up the full width of the window
+    Full,
+    /// Extends under the left dock while snapping to the right dock
+    LeftAligned,
+    /// Extends under the right dock while snapping to the left dock
+    RightAligned,
+}
+
 #[derive(Copy, Clone, Default, Serialize, Deserialize, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum CloseWindowWhenNoItems {
@@ -109,6 +124,10 @@ pub enum RestoreOnStartupBehavior {
 pub struct WorkspaceSettingsContent {
     /// Active pane styling settings.
     pub active_pane_modifiers: Option<ActivePanelModifiers>,
+    /// Layout mode for the bottom dock
+    ///
+    /// Default: contained
+    pub bottom_dock_layout: Option<BottomDockLayout>,
     /// Direction to split horizontally.
     ///
     /// Default: "up"