add muted_hover token and rework tab strip visuals

crates/theme/src/resolve.rs

@@ -111,6 +111,11 @@ pub(crate) fn resolve(
             base.secondary_foreground,
         ),
         muted: pick(def_color(|d| d.muted()), system_palette.muted, base.muted),
+        muted_hover: pick(
+            def_color(|d| d.muted_hover()),
+            system_palette.muted_hover,
+            base.muted_hover,
+        ),
         muted_foreground: pick(
             def_color(|d| d.muted_foreground()),
             system_palette.muted_foreground,
@@ -601,4 +606,20 @@ mod tests {
         let preset_stated = resolve(&system(ThemeVariant::Dark, palette, None), Some(&def), None);
         assert_eq!(preset_stated.colors.info, hsla(0x0ea5e9));
     }
+
+    #[test]
+    fn muted_hover_follows_the_overlay_chain() {
+        // No platform states a hover wash; a preset or user file is the only
+        // override above the neutral base.
+        let palette = PartialPalette {
+            muted_hover: Some(hsla(0x155e75)),
+            ..PartialPalette::default()
+        };
+        let stated = resolve(&system(ThemeVariant::Dark, palette, None), None, None);
+        assert_eq!(stated.colors.muted_hover, hsla(0x155e75));
+
+        let def = ThemeDefinition::parse_toml("muted_hover = \"#0ea5e9\"\n").unwrap();
+        let preset_stated = resolve(&system(ThemeVariant::Dark, palette, None), Some(&def), None);
+        assert_eq!(preset_stated.colors.muted_hover, hsla(0x0ea5e9));
+    }
 }