fix: ER diagram row contrast, mindmap branch colors, timeline blue boxes, xyChart blue bars

frontend/js/mermaid-viewer.js

@@ -55,8 +55,8 @@ var DARK_THEME = {
   primaryTextColor: '#c8daf0',
   primaryBorderColor: '#4a7ab5',
   lineColor: '#5a7a9a',
-  secondaryColor: '#1a2d47',
-  tertiaryColor: '#142236',
+  secondaryColor: '#2a4a6a',
+  tertiaryColor: '#3a6090',
   // Background & containers
   background: '#0f1117',
   mainBkg: '#1a2030',
@@ -137,8 +137,43 @@ var DARK_THEME = {
   classText: '#c8daf0',
   // State diagram
   labelColor: '#c8daf0',
-  // ER diagram
-  attributeEvenColor: '#c8daf0',
+  // ER diagram — alternating row colors for readability
+  fillType0: '#1a2d47',
+  fillType1: '#1e3a55',
+  fillType2: '#223350',
+  fillType3: '#1a2a40',
+  fillType4: '#1e3350',
+  fillType5: '#223a58',
+  fillType6: '#1a2d47',
+  fillType7: '#1e3a55',
+  entityBorder: '#4a7ab5',
+  attributeEvenColor: '#e0e8f0',
+  // Timeline — section colors
+  cScale0: '#1e3a5f',
+  cScale1: '#2a5a8a',
+  cScale2: '#153050',
+  cScale3: '#3a6a9a',
+  cScale4: '#204070',
+  cScale5: '#4a7ab5',
+  cScaleLabel0: '#c8daf0',
+  cScaleLabel1: '#c8daf0',
+  cScaleLabel2: '#c8daf0',
+  cScaleLabel3: '#c8daf0',
+  cScaleLabel4: '#c8daf0',
+  cScaleLabel5: '#c8daf0',
+  // XY Chart — bar and line colors
+  xyChartBackgroundColor: '#0f1117',
+  xyChartTitleColor: '#c8daf0',
+  xyChartXaxisTitleColor: '#8aacca',
+  xyChartYaxisTitleColor: '#8aacca',
+  plotColor1: '#1e3a5f',
+  plotColor2: '#4a7ab5',
+  plotColor3: '#2a5a8a',
+  plotColor4: '#5a8ac0',
+  plotColor5: '#3a6a9a',
+  plotColor6: '#6a9ad0',
+  plotColor7: '#153050',
+  plotColor8: '#204070',
   // General text
   textColor: '#c8daf0',
   fontSize: '14px',