fix(clipboard): use navigator.clipboard.writeText as primary, arboard as fallback — fixes silent failure on Linux/XWayland

src/lib/pages/HistoryPage.svelte

@@ -178,7 +178,9 @@
   }
 
   function copyItem(item) {
-    invoke("copy_to_clipboard", { text: item.text }).catch(() => {});
+    navigator.clipboard.writeText(item.text).catch(() => {
+      invoke("copy_to_clipboard", { text: item.text }).catch(() => {});
+    });
   }
 
   function removeItem(item) {