refactor(engine): extract shared spawn_tab_chip widget into ui_modal

Settings' tab_chip becomes a thin wrapper; the You hub (Phase E) will
reuse the same widget so tabbed modals stay visually identical.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

solitaire_engine/src/settings_plugin/ui.rs

@@ -18,6 +18,7 @@ use crate::theme::{ImportError, import_theme, refresh_registry};
 use crate::ui_focus::FocusRow;
 use crate::ui_modal::{
     ButtonVariant, spawn_modal, spawn_modal_actions, spawn_modal_button, spawn_modal_header,
+    spawn_tab_chip,
 };
 use crate::ui_theme::{
     BG_BASE, BG_ELEVATED, BG_ELEVATED_HI, BORDER_SUBTLE, HighContrastBorder, RADIUS_SM,
@@ -117,41 +118,22 @@ pub(super) fn spawn_settings_panel(
     });
 }
 
-/// One Settings tab chip. The active chip is filled + bright; inactive
-/// chips are quiet outlines.
+/// One Settings tab chip — thin wrapper over the shared
+/// [`spawn_tab_chip`] widget so Settings and the You hub stay visually
+/// identical.
 fn tab_chip(
     parent: &mut ChildSpawnerCommands,
     tab: SettingsTab,
     active: bool,
     font_res: Option<&FontResource>,
 ) {
-    let font = TextFont {
-        font: font_res.map(|f| f.0.clone()).unwrap_or_default(),
-        font_size: TYPE_CAPTION,
-        ..default()
-    };
-    parent
-        .spawn((
-            SettingsTabButton(tab),
-            Button,
-            Node {
-                padding: UiRect::axes(VAL_SPACE_3, VAL_SPACE_2),
-                justify_content: JustifyContent::Center,
-                border: UiRect::all(Val::Px(1.0)),
-                border_radius: BorderRadius::all(Val::Px(RADIUS_SM)),
-                ..default()
-            },
-            BackgroundColor(if active { BG_ELEVATED_HI } else { BG_BASE }),
-            BorderColor::all(if active { STATE_SUCCESS } else { BORDER_SUBTLE }),
-            HighContrastBorder::with_default(if active { STATE_SUCCESS } else { BORDER_SUBTLE }),
-        ))
-        .with_children(|b| {
-            b.spawn((
-                Text::new(tab.label()),
-                font,
-                TextColor(if active { TEXT_PRIMARY } else { TEXT_SECONDARY }),
-            ));
-        });
+    spawn_tab_chip(
+        parent,
+        SettingsTabButton(tab),
+        tab.label(),
+        active,
+        font_res,
+    );
 }
 
 /// Audio tab: the two volume rows.

solitaire_engine/src/ui_modal.rs

@@ -60,9 +60,9 @@ use crate::settings_plugin::SettingsResource;
 use crate::ui_theme::{
     ACCENT_PRIMARY, ACCENT_PRIMARY_HOVER, ACCENT_SECONDARY, BG_BASE, BG_ELEVATED, BG_ELEVATED_HI,
     BG_ELEVATED_PRESSED, BG_ELEVATED_TOP, BORDER_STRONG, BORDER_SUBTLE, HighContrastBorder,
-    MOTION_MODAL_SECS, RADIUS_LG, RADIUS_MD, SCRIM, TEXT_PRIMARY, TEXT_SECONDARY, TYPE_BODY_LG,
-    TYPE_CAPTION, TYPE_HEADLINE, VAL_SPACE_2, VAL_SPACE_3, VAL_SPACE_4, VAL_SPACE_5,
-    scaled_duration,
+    MOTION_MODAL_SECS, RADIUS_LG, RADIUS_MD, RADIUS_SM, SCRIM, STATE_SUCCESS, TEXT_PRIMARY,
+    TEXT_SECONDARY, TYPE_BODY_LG, TYPE_CAPTION, TYPE_HEADLINE, VAL_SPACE_2, VAL_SPACE_3,
+    VAL_SPACE_4, VAL_SPACE_5, scaled_duration,
 };
 
 // ---------------------------------------------------------------------------
@@ -402,6 +402,46 @@ pub fn spawn_modal_button<M: Component>(
         });
 }
 
+/// One tab chip for a tabbed modal (Settings, the You hub). The active
+/// chip is filled + bright with a success-green border; inactive chips
+/// are quiet outlines. `marker` is the plugin's click-target component
+/// carrying which tab the chip selects.
+pub fn spawn_tab_chip<M: Component>(
+    parent: &mut ChildSpawnerCommands,
+    marker: M,
+    label: &str,
+    active: bool,
+    font_res: Option<&FontResource>,
+) {
+    let font = TextFont {
+        font: font_res.map(|f| f.0.clone()).unwrap_or_default(),
+        font_size: TYPE_CAPTION,
+        ..default()
+    };
+    parent
+        .spawn((
+            marker,
+            Button,
+            Node {
+                padding: UiRect::axes(VAL_SPACE_3, VAL_SPACE_2),
+                justify_content: JustifyContent::Center,
+                border: UiRect::all(Val::Px(1.0)),
+                border_radius: BorderRadius::all(Val::Px(RADIUS_SM)),
+                ..default()
+            },
+            BackgroundColor(if active { BG_ELEVATED_HI } else { BG_BASE }),
+            BorderColor::all(if active { STATE_SUCCESS } else { BORDER_SUBTLE }),
+            HighContrastBorder::with_default(if active { STATE_SUCCESS } else { BORDER_SUBTLE }),
+        ))
+        .with_children(|b| {
+            b.spawn((
+                Text::new(label),
+                font,
+                TextColor(if active { TEXT_PRIMARY } else { TEXT_SECONDARY }),
+            ));
+        });
+}
+
 // ---------------------------------------------------------------------------
 // Generic touch-scroll helper
 // ---------------------------------------------------------------------------