fix(statusbar): scale pill number, label and badge follow one viewport

The pill number used the first-content fallback while the label and sync badge used explicit-only resolution, showing e.g. a 1:50 number beside a 1:1 label with no badge. Label and badge now resolve through target_viewport_handle like the number; render-path handle fn, set-paths and Model branches untouched. Tests: scale_pill_sources_agree_without_targeted_viewport (RED: live probe Some(0.02)/1:1/None) plus Model-unchanged pin. Full suite: 2027 passed / 0 failed / 25 ignored.

src/scene/mod.rs

@@ -6386,7 +6386,13 @@ impl Scene {
         if self.current_layout == "Model" {
             return self.document.header.current_annotation_scale.clone();
         }
-        self.explicit_viewport_handle()
+        // Same viewport the pill number comes from (active → selected →
+        // first-content fallback), so label, number and badge always describe
+        // one viewport (#48). Degenerate case: with zero Scale objects the
+        // name falls back to paper/"1:1" while the number stays factual.
+        // The render paths use displayed_annotation_scale_HANDLE, which stays
+        // explicit-only — untouched by this fix.
+        self.target_viewport_handle()
             .and_then(|viewport| self.viewport_scale_handle(viewport))
             .and_then(|handle| match self.document.objects.get(&handle) {
                 Some(ObjectType::Scale(scale)) => Some(scale.name.clone()),
@@ -6480,7 +6486,8 @@ impl Scene {
     }
 
     pub fn viewport_annotation_scale_synced(&self) -> Option<bool> {
-        let viewport = self.explicit_viewport_handle()?;
+        // Same viewport as the pill number and label (#48).
+        let viewport = self.target_viewport_handle()?;
         let EntityType::Viewport(vp) = self.document.get_entity(viewport)? else {
             return None;
         };
@@ -14447,6 +14454,48 @@ mod layout_cache_tests {
         );
         assert!(after.iter().any(|n| n == "TEST_CACHED_UCS"));
     }
+
+    // #48: with no active/selected viewport, the pill number, label and sync
+    // badge must all describe the SAME viewport (the first-content fallback
+    // the number already used) — not a mix of viewport number, paper label
+    // and hidden badge.
+    #[test]
+    fn scale_pill_sources_agree_without_targeted_viewport() {
+        let mut scene = Scene::new();
+        scene.add_layout("P1").unwrap();
+        scene.current_layout = "P1".to_string();
+        assert!(scene.add_scale("1:50", 1.0, 50.0));
+        let mut vp = codec::entities::Viewport::new();
+        vp.width = 100.0;
+        vp.height = 100.0;
+        let handle = scene
+            .document
+            .add_entity_to_layout(codec::EntityType::Viewport(vp), "P1")
+            .unwrap();
+        assert!(scene.set_viewport_scale_named_for(handle, "1:50").is_some());
+        assert!(scene.active_viewport.is_none());
+        let number = scene.first_viewport_scale();
+        let name = scene.displayed_annotation_scale_name();
+        let synced = scene.viewport_annotation_scale_synced();
+        eprintln!("number={number:?} name={name:?} synced={synced:?}");
+        assert!(
+            number.is_some() && name == "1:50" && synced == Some(true),
+            "pill trio must agree"
+        );
+    }
+
+    #[test]
+    fn scale_pill_model_layout_unchanged() {
+        // Model layout has no viewports: number None, header label, no badge.
+        let scene = Scene::new();
+        assert!(scene.current_layout == "Model");
+        assert!(scene.first_viewport_scale().is_none());
+        assert_eq!(
+            scene.displayed_annotation_scale_name(),
+            scene.document.header.current_annotation_scale
+        );
+        assert!(scene.viewport_annotation_scale_synced().is_none());
+    }
 }
 
 #[cfg(test)]