WIP UI Tweaks (#2911)

- Tighten up toolbar
- Reduce intensity of active tools
- Remove divider between project + branch
- Add a styletree for toolbar + move breadcrumb into it
- Some ts theme tidying

[[PR Description]]

Release Notes:

- Improved density and contrast of a number of UI elements.

crates/theme/src/theme.rs

@@ -88,8 +88,6 @@ pub struct Workspace {
     pub dock: Dock,
     pub status_bar: StatusBar,
     pub toolbar: Toolbar,
-    pub breadcrumb_height: f32,
-    pub breadcrumbs: Interactive<ContainedText>,
     pub disconnected_overlay: ContainedText,
     pub modal: ContainerStyle,
     pub zoomed_panel_foreground: ContainerStyle,
@@ -120,7 +118,6 @@ pub struct Titlebar {
     pub height: f32,
     pub menu: TitlebarMenu,
     pub project_menu_button: Toggleable<Interactive<ContainedText>>,
-    pub project_name_divider: ContainedText,
     pub git_menu_button: Toggleable<Interactive<ContainedText>>,
     pub item_spacing: f32,
     pub face_pile_spacing: f32,
@@ -411,6 +408,8 @@ pub struct Toolbar {
     pub height: f32,
     pub item_spacing: f32,
     pub toggleable_tool: Toggleable<Interactive<IconButton>>,
+    pub breadcrumb_height: f32,
+    pub breadcrumbs: Interactive<ContainedText>,
 }
 
 #[derive(Clone, Deserialize, Default, JsonSchema)]