Show error when navigator.clipboard is not available.

There can be multiple reasons for this, e.g. it is not supported by the
browser or the browser does not provide this feature because there is no
secure context (HTTP).

Closes #231.

ui/src/components/AesKeyInput.tsx

@@ -96,6 +96,12 @@ function AesKeyInput(props: IProps) {
             duration: 3,
           });
         });
+    } else {
+      notification.error({
+        message: "Error",
+        description: "Clipboard functionality is not available.",
+        duration: 3,
+      });
     }
   };
 

ui/src/components/DevAddrInput.tsx

@@ -99,6 +99,12 @@ function DevAddrInput(props: IProps) {
             duration: 3,
           });
         });
+    } else {
+      notification.error({
+        message: "Error",
+        description: "Clipboard functionality is not available.",
+        duration: 3,
+      });
     }
   };
 

ui/src/components/EuiInput.tsx

@@ -96,6 +96,12 @@ function EuiInput(props: IProps) {
             duration: 3,
           });
         });
+    } else {
+      notification.error({
+        message: "Error",
+        description: "Clipboard functionality is not available.",
+        duration: 3,
+      });
     }
   };