fix: improve workbench height & box-sizing (#223)

Author: mortalYoung

src/components/collapse/style.scss

@@ -40,11 +40,12 @@ $collapse__extra: #{$collapse}__extra;
     &__header {
         align-items: center;
         border: 1px solid transparent;
+        box-sizing: border-box;
         cursor: pointer;
         display: flex;
         font-size: 11px;
         font-weight: bold;
-        height: 22px;
+        height: 25px;
         outline: none;
         padding: 1px 2px;
         user-select: none;

src/workbench/activityBar/style.scss

@@ -2,7 +2,6 @@
 
 #{$activityBar} {
     flex: 1;
-    padding-bottom: 20px;
     width: 48px;
 
     &__container {

src/workbench/sidebar/style.scss

@@ -6,6 +6,10 @@
     position: relative;
     width: 100%;
 
+    &-explorer {
+        height: 100%;
+    }
+
     h2 {
         cursor: default;
         font-size: 11px;
@@ -44,7 +48,7 @@
 
     &__content {
         bottom: 0;
-        height: calc(100vh - 57px);
+        height: calc(100% - 35px);
         left: 0;
         position: relative;
         right: 0;

src/workbench/style.scss

@@ -2,6 +2,7 @@
 
 #{$workbench} {
     bottom: 0;
+    height: calc(100% - 22px);
     left: 0;
     position: absolute;
     right: 0;