feed: ignore shift click

the global click callback should ignore shift click which allows
to use native browser behavior (open link in new window).

src/main.ts

@@ -278,13 +278,13 @@ const handleButton = (button: HTMLButtonElement) => {
 };
 
 document.body.addEventListener('click', (event: MouseEvent) => {
+  // dont intercept command or shift-click
+  if (event.metaKey || event.shiftKey) {
+    return;
+  }
   const target = event.target as HTMLElement;
   const a = target?.closest('a');
   if (a) {
-    // dont intercept command-click
-    if (event.metaKey) {
-      return;
-    }
     handleLink(a, event);
     return;
   }