Use proper semantic color values

Adjust header colors on light theme

- Use adjusted background-color for header instead of text.hint.
- Use slightly darker secondary font color for better readability against the
  head background color.

Use more semantic theme colors for bug list
Use more semantic theme colors for bug messages
Fix usage of text hint for filter header

webui/src/pages/bug/Message.tsx

@@ -1,7 +1,7 @@
 import React from 'react';
 
 import Paper from '@material-ui/core/Paper';
-import { fade, makeStyles } from '@material-ui/core/styles';
+import { makeStyles } from '@material-ui/core/styles';
 
 import Author, { Avatar } from 'src/components/Author';
 import Content from 'src/components/Content';
@@ -31,7 +31,9 @@ const useStyles = makeStyles((theme) => ({
     padding: '0.5rem 1rem',
     borderBottom: `1px solid ${theme.palette.divider}`,
     display: 'flex',
-    backgroundColor: fade(theme.palette.text.hint, 0.05),
+    borderTopRightRadius: theme.shape.borderRadius,
+    borderTopLeftRadius: theme.shape.borderRadius,
+    backgroundColor: theme.palette.info.main,
   },
   title: {
     flex: 1,

webui/src/pages/list/FilterToolbar.tsx

@@ -3,7 +3,7 @@ import { LocationDescriptor } from 'history';
 import React from 'react';
 
 import Toolbar from '@material-ui/core/Toolbar';
-import { fade, makeStyles } from '@material-ui/core/styles';
+import { makeStyles } from '@material-ui/core/styles';
 import CheckCircleOutline from '@material-ui/icons/CheckCircleOutline';
 import ErrorOutline from '@material-ui/icons/ErrorOutline';
 
@@ -19,7 +19,7 @@ import { useBugCountQuery } from './FilterToolbar.generated';
 
 const useStyles = makeStyles((theme) => ({
   toolbar: {
-    backgroundColor: fade(theme.palette.text.hint, 0.05),
+    backgroundColor: theme.palette.primary.light,
     borderColor: theme.palette.divider,
     borderWidth: '1px 0',
     borderStyle: 'solid',

webui/src/pages/list/ListQuery.tsx

@@ -6,7 +6,7 @@ import { Button } from '@material-ui/core';
 import IconButton from '@material-ui/core/IconButton';
 import InputBase from '@material-ui/core/InputBase';
 import Paper from '@material-ui/core/Paper';
-import { fade, makeStyles, Theme } from '@material-ui/core/styles';
+import { makeStyles, Theme } from '@material-ui/core/styles';
 import ErrorOutline from '@material-ui/icons/ErrorOutline';
 import KeyboardArrowLeft from '@material-ui/icons/KeyboardArrowLeft';
 import KeyboardArrowRight from '@material-ui/icons/KeyboardArrowRight';
@@ -56,10 +56,11 @@ const useStyles = makeStyles<Theme, StylesProps>((theme) => ({
   },
   search: {
     borderRadius: theme.shape.borderRadius,
+    color: theme.palette.text.secondary,
     borderColor: theme.palette.divider,
     borderStyle: 'solid',
     borderWidth: '1px',
-    backgroundColor: fade(theme.palette.text.hint, 0.05),
+    backgroundColor: theme.palette.primary.light,
     padding: theme.spacing(0, 1),
     width: ({ searching }) => (searching ? '20rem' : '15rem'),
     transition: theme.transitions.create([
@@ -69,13 +70,11 @@ const useStyles = makeStyles<Theme, StylesProps>((theme) => ({
     ]),
   },
   searchFocused: {
-    borderColor: fade(theme.palette.primary.main, 0.4),
     backgroundColor: theme.palette.background.paper,
-    width: '20rem!important',
   },
   placeholderRow: {
     padding: theme.spacing(1),
-    borderBottomColor: theme.palette.grey['300'],
+    borderBottomColor: theme.palette.divider,
     borderBottomWidth: '1px',
     borderBottomStyle: 'solid',
     display: 'flex',
@@ -91,7 +90,8 @@ const useStyles = makeStyles<Theme, StylesProps>((theme) => ({
     ...theme.typography.h5,
     padding: theme.spacing(8),
     textAlign: 'center',
-    borderBottomColor: theme.palette.grey['300'],
+    color: theme.palette.text.hint,
+    borderBottomColor: theme.palette.divider,
     borderBottomWidth: '1px',
     borderBottomStyle: 'solid',
     '& > p': {
@@ -99,12 +99,15 @@ const useStyles = makeStyles<Theme, StylesProps>((theme) => ({
     },
   },
   errorBox: {
-    color: theme.palette.error.main,
+    color: theme.palette.error.dark,
     '& > pre': {
       fontSize: '1rem',
       textAlign: 'left',
-      backgroundColor: theme.palette.grey['900'],
-      color: theme.palette.common.white,
+      borderColor: theme.palette.divider,
+      borderWidth: '1px',
+      borderRadius: theme.shape.borderRadius,
+      borderStyle: 'solid',
+      color: theme.palette.text.primary,
       marginTop: theme.spacing(4),
       padding: theme.spacing(2, 3),
     },

webui/src/themes/DefaultDark.ts

@@ -5,6 +5,14 @@ const defaultDarkTheme = createMuiTheme({
     type: 'dark',
     primary: {
       main: '#263238',
+      light: '#525252',
+    },
+    error: {
+      main: '#f44336',
+      dark: '#ff4949',
+    },
+    info: {
+      main: '#2a393e',
     },
   },
 });

webui/src/themes/DefaultLight.ts

@@ -5,6 +5,13 @@ const defaultLightTheme = createMuiTheme({
     type: 'light',
     primary: {
       main: '#263238',
+      light: '#f5f5f5',
+    },
+    info: {
+      main: '#e2f1ff',
+    },
+    text: {
+      secondary: '#555',
     },
   },
 });