style(ui): add explicit parentheses for arithmetic precedence

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>

Author: JasonXuDeveloper

UnityProject/Packages/com.jasonxudeveloper.jengine.ui/Editor/Components/Navigation/JTabView.cs

@@ -125,7 +125,7 @@ public JTabView AddTab(string label, VisualElement content)
             if (_maxTabsPerRow > 0)
             {
                 // Reduce basis to account for per-tab margins; flexGrow fills remaining space
-                var percent = (100f - _maxTabsPerRow * 2f) / _maxTabsPerRow;
+                var percent = (100f - (_maxTabsPerRow * 2f)) / _maxTabsPerRow;
                 tabButton.style.flexBasis = new StyleLength(new Length(percent, LengthUnit.Percent));
                 tabButton.style.flexGrow = 1;
                 tabButton.style.flexShrink = 1;

UnityProject/Packages/com.jasonxudeveloper.jengine.ui/Tests/Editor/Components/Navigation/JTabViewTests.cs

@@ -484,7 +484,7 @@ public void AddTab_WithMaxTabsPerRow_SetsFlexBasisPercent()
             // (100 - 3*2) / 3 = 31.33...%
             var basis = tabButton.style.flexBasis; // StyleLength
             Assert.AreEqual(LengthUnit.Percent, basis.value.unit);
-            Assert.AreEqual((100f - 3f * 2f) / 3f, basis.value.value, 0.01f);
+            Assert.AreEqual((100f - (3f * 2f)) / 3f, basis.value.value, 0.01f);
         }
 
         [Test]
@@ -520,7 +520,7 @@ public void AddTab_MaxTabsPerRow2_SetsCorrectBasis()
             var tabButton = bar[0] as Label;
 
             // (100 - 2*2) / 2 = 48%
-            Assert.AreEqual((100f - 2f * 2f) / 2f, tabButton.style.flexBasis.value.value, 0.01f);
+            Assert.AreEqual((100f - (2f * 2f)) / 2f, tabButton.style.flexBasis.value.value, 0.01f);
         }
 
         #endregion