Consolidate unstyled font smoothing styles

**Why**:

- Account for missing `usa-button--unstyled:hover` and `usa-button--unstyled:active`
- Single point to remove in the future, as noted in the preceding comment

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Fix rounded corners on sidebar current page item.
 - Fix unintentional rounded corners on search text field.
 - Fix utility classes not always applying as expected when applied to components. For example, using `margin-` utility classes on an unstyled button would previously unexpectedly conflict with and not take precedent over the button's own margins.
+- Fix all instances of font weight appearance of unstyled buttons in content which applies anti-aliased font smoothing. Previous bug fix attempts had still missed default `:hover` and `:active` states.
 
 ## 5.0.3
 

src/scss/components/_buttons.scss

@@ -26,8 +26,16 @@ $button-stroke-big: inset 0 0 0 units($theme-button-stroke-width * 2);
   // reset, these styles could be safely removed.
   //
   // See: https://github.com/uswds/uswds/pull/4115
-  -moz-osx-font-smoothing: inherit;
-  -webkit-font-smoothing: inherit;
+  &,
+  &:hover,
+  &.usa-button--hover,
+  &:active,
+  &.usa-button--active,
+  &:disabled,
+  &.usa-button--disabled {
+    -moz-osx-font-smoothing: inherit;
+    -webkit-font-smoothing: inherit;
+  }
 
   // USWDS currently only sets hover and active unstyled button styles for the browser-native
   // states, and not with the modifier classes. It also does not apply these styles to the disabled
@@ -39,8 +47,6 @@ $button-stroke-big: inset 0 0 0 units($theme-button-stroke-width * 2);
   &.usa-button--active,
   &:disabled,
   &.usa-button--disabled {
-    -moz-osx-font-smoothing: inherit;
-    -webkit-font-smoothing: inherit;
     background-color: transparent;
     box-shadow: none;
     text-decoration: underline;