new_editor: unify shared UI text measurement semantics

new_editor/include/XCEditor/Shell/UIEditorStatusBar.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <XCEditor/Foundation/UIEditorTextMeasurement.h>
+
 #include <XCEngine/UI/DrawData.h>
 
 #include <cstddef>
@@ -38,7 +40,8 @@ struct UIEditorStatusBarSegment {
     UIEditorStatusBarTextTone tone = UIEditorStatusBarTextTone::Primary;
     bool interactive = true;
     bool showSeparator = false;
-    float desiredWidth = 0.0f;
+    // Pure measured label width. Segment padding is applied only in layout.
+    float measuredLabelWidth = 0.0f;
 };
 
 struct UIEditorStatusBarState {
@@ -57,6 +60,8 @@ struct UIEditorStatusBarMetrics {
     float separatorInsetY = 5.0f;
     float slotGapMin = 18.0f;
     float cornerRounding = 0.0f;
+    float labelFontSize = 12.0f;
+    float labelInsetY = 0.0f;
     float estimatedGlyphWidth = 6.5f;
     float borderThickness = 1.0f;
     float focusedBorderThickness = 1.0f;
@@ -100,6 +105,11 @@ struct UIEditorStatusBarHitTarget {
     std::size_t index = UIEditorStatusBarInvalidIndex;
 };
 
+float ResolveUIEditorStatusBarMeasuredLabelWidth(
+    const UIEditorStatusBarSegment& segment,
+    const UIEditorStatusBarMetrics& metrics = {},
+    const UIEditorTextMeasurer* textMeasurer = nullptr);
+
 float ResolveUIEditorStatusBarDesiredSegmentWidth(
     const UIEditorStatusBarSegment& segment,
     const UIEditorStatusBarMetrics& metrics = {});