refactor: 1 more timer cleanup and more nit-picks

scripts/common.js

@@ -21,7 +21,7 @@ exports.sections_config = {
     '': { // '' is the default section when no 'section' specified in pages.js (to avoid adding 'app' as section for all)
         path     : '',
         js_files : ['vendor', 'binary'],
-        css_files: ['common.min', 'app.min', 'static.min','reset.min'],
+        css_files: ['common.min', 'app.min', 'static.min', 'reset.min'],
         has_pjax : true,
     },
 };

src/javascript/app/pages/bottom/tabs.jsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react';
+import React, { useEffect, useRef, useState } from 'react';
 import ReactDOM from 'react-dom';
 import { SegmentedControlSingleChoice } from '@deriv-com/quill-ui';
 import { Explanation } from './explanation.jsx';
@@ -75,9 +75,7 @@ const BottomTabs = () => {
         }, 100);
     }, [selectedTab, savedTab]);
 
-    useEffect(() => {
-        return () => clearTimeout(triggerOldTabTimer.current);
-    }, []);
+    useEffect(() => () => clearTimeout(triggerOldTabTimer.current), []);
 
     return (
         <>

src/javascript/app/pages/trade/markets/contracts-dropdown.jsx

@@ -10,6 +10,7 @@ export const ContractDropdown = () => {
     const [data, setData] = useState(dataManager.getAllContracts());
     const selectedRef = useRef(null);
     const containerRef = useRef(null);
+    const closeDropdownTimer = useRef();
 
     const onContractClick = (formName) => {
         if (formName === data?.formName) { return; }
@@ -30,12 +31,13 @@ export const ContractDropdown = () => {
 
         triggerContractChange();
 
-        setTimeout(() => {
+        closeDropdownTimer.current = setTimeout(() => {
             close();
         }, 10);
-
     };
 
+    useEffect(() => () => clearTimeout(closeDropdownTimer.current), []);
+
     useEffect(() => {
         setData(oldData => ({
             ...oldData,

src/sass/_common/components.scss

@@ -28,7 +28,7 @@
     }
 }
 
-.highcharts-container { 
+.highcharts-container {
     .highcharts-subtitle {
         white-space: normal !important;