[background] Use low contrast rules and dots in page backgrounds

src/core/view/background/DottedBackgroundPainter.cpp

@@ -7,9 +7,9 @@ DottedBackgroundPainter::DottedBackgroundPainter() = default;
 DottedBackgroundPainter::~DottedBackgroundPainter() = default;
 
 void DottedBackgroundPainter::resetConfig() {
-    this->defaultForegroundColor1 = 0xBDBDBDU;
+    this->defaultForegroundColor1 = 0x303030U;
     this->defaultAlternativeForegroundColor1 = 0x434343U;
-    this->lineWidth = 1.5;
+    this->lineWidth = 1.0;
     this->drawRaster1 = 10;
 }
 

src/core/view/background/GraphBackgroundPainter.cpp

@@ -9,7 +9,7 @@ GraphBackgroundPainter::GraphBackgroundPainter() = default;
 GraphBackgroundPainter::~GraphBackgroundPainter() = default;
 
 void GraphBackgroundPainter::resetConfig() {
-    this->defaultForegroundColor1 = 0xBDBDBDU;
+    this->defaultForegroundColor1 = 0x303030;
     this->defaultAlternativeForegroundColor1 = 0x434343U;
     this->lineWidth = 0.5;
     this->drawRaster1 = 14.17;

src/core/view/background/LineBackgroundPainter.cpp

@@ -7,9 +7,9 @@ LineBackgroundPainter::LineBackgroundPainter(bool verticalLine): verticalLine(ve
 LineBackgroundPainter::~LineBackgroundPainter() = default;
 
 void LineBackgroundPainter::resetConfig() {
-    this->defaultForegroundColor1 = 0x40A0FFU;
+    this->defaultForegroundColor1 = 0x303030U;
     this->defaultAlternativeForegroundColor1 = 0x434343U;
-    this->defaultForegroundColor2 = 0xFF0080U;
+    this->defaultForegroundColor2 = 0xDF223FU;
     this->defaultAlternativeForegroundColor2 = 0x220080U;
     this->lineWidth = 0.5;
 }