Part of #663: User Interface > Show Tool Group Labels

The toolbar names its tool groups (Select, Shapes, Draw, Modify...). A new
preference, on by default, turns the names off for a cleaner toolbar: a faint
dash then separates the groups.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/cmd/prefscmds.rs

@@ -275,6 +275,7 @@ pub const PREF_SPECS: &[PrefSpec] = &[
         ])
     ),
     p!("autoCollapseIconPanels", "User Interface", "", "Auto-Collapse Iconic Panels", bool),
+    p!("toolGroupLabels", "User Interface", "", "Show Tool Group Labels", bool),
     p!("openDocumentsAsTabs", "User Interface", "", "Open Documents As Tabs", bool),
     p!("largeTabs", "User Interface", "", "Large Tabs", bool),
     p!("uiScaling", "User Interface", "UI Scaling", "Scale", num(0.75, 2.0, "×")),

crates/engine/src/lib.rs

@@ -491,6 +491,9 @@ pub struct Prefs {
     pub ui_brightness: String,
     pub canvas_color: String,
     pub auto_collapse_icon_panels: bool,
+    /// User Interface › Show Tool Group Labels: the toolbar's group names (Select, Shapes, Draw…);
+    /// off, a faint dash separates the groups instead (#663).
+    pub tool_group_labels: bool,
     pub open_documents_as_tabs: bool,
     pub large_tabs: bool,
     pub ui_scaling: f64,
@@ -706,6 +709,7 @@ impl Default for Prefs {
             ui_brightness: s("mediumDark"),
             canvas_color: s("matchUi"),
             auto_collapse_icon_panels: false,
+            tool_group_labels: true,
             open_documents_as_tabs: true,
             large_tabs: false,
             ui_scaling: 1.0,