Merge commit 'dbb20f76a781defe35d077529c8269d712c1fbd2' into glitch-soc/merge-upstream

Conflicts:
- `tsconfig.json`:
  glitch-soc had extra paths under `app/javascript/flavours`, but upstream
  added `app/javascript` as a whole, so updated to upstream's.

app/javascript/styles/mastodon/admin.scss

@@ -1648,6 +1648,17 @@ a.sparkline {
         }
       }
 
+      a.timestamp {
+        color: $darker-text-color;
+        text-decoration: none;
+
+        &:hover,
+        &:focus,
+        &:active {
+          text-decoration: underline;
+        }
+      }
+
       time {
         margin-inline-start: 5px;
         vertical-align: baseline;