Use `font-normal` and `font-small` mixins where possible

src/styles/sidebar/components/annotation-share-control.scss

@@ -30,14 +30,14 @@
   }
 
   & .form-input {
+    @include var.font-small;
     padding: 0.5em;
     border-radius: 0;
-    font-size: var.$small-font-size;
   }
 
   &__permissions {
+    @include var.font-small;
     margin: 0.5em 0;
-    font-size: var.$small-font-size;
   }
 
   &__arrow {

src/styles/sidebar/components/annotation-share-info.scss

@@ -6,9 +6,9 @@
 
   &__group,
   &__private {
+    @include var.font-normal;
     display: flex;
     align-items: baseline;
-    font-size: var.$body1-font-size;
     color: var.$color-text-light;
   }
 

src/styles/sidebar/components/autocomplete-list.scss

@@ -8,6 +8,7 @@
 }
 
 .autocomplete-list__items {
+  @include var.font-normal;
   @supports (clip-path: polygon(0 0, 100% 0, 0% 100%, 0% 100%)) {
     &:before {
       /**
@@ -29,7 +30,6 @@
     }
   }
   position: absolute;
-  font-size: var.$body2-font-size;
   top: 5px;
   max-width: 100%;
   min-width: 10em;

src/styles/sidebar/components/help-panel.scss

@@ -10,11 +10,10 @@
   }
 
   &__content {
+    @include var.font-normal;
     padding: 0.5em;
     border-top: 1px solid var.$grey-3;
     border-bottom: 1px solid var.$grey-3;
-    line-height: var.$normal-line-height;
-    font-size: var.$normal-font-size;
 
     a {
       text-decoration: underline;

src/styles/sidebar/components/markdown-editor.scss

@@ -42,7 +42,7 @@ $toolbar-border: 0.1em solid var.$grey-3;
   }
 
   &.is-text {
-    font-size: 13px;
+    @include var.font-normal;
   }
 
   &-icon {

src/styles/sidebar/components/menu-section.scss

@@ -5,8 +5,8 @@
 }
 
 .menu-section__heading {
+  @include var.font-normal;
   color: var.$color-text-light;
-  font-size: var.$body1-font-size;
   line-height: 1;
   margin: 1px 1px 0;
   margin-bottom: 10px;

src/styles/sidebar/components/moderation-banner.scss

@@ -5,12 +5,12 @@
   $h-padding: 15px;
 
   .moderation-banner {
+    @include var.font-normal;
     position: relative;
 
     color: white;
     display: flex;
     flex-direction: row;
-    font-size: var.$normal-font-size;
     font-weight: bold;
   }