fix: join fronters in query output properly

src/entrypoints/popup/App.svelte

···
                                                     >{fronter.name}</a
                                                 >
                                             {:else}
-                                                {fronter.name}
-                                            {/if}
-                                            {#if i < queryResult.fronters.length - 1},
+                                                {fronter.name +
+                                                    (i <
+                                                    queryResult.fronters
+                                                        .length -
+                                                        1
+                                                        ? ", "
+                                                        : "")}
                                             {/if}
                                         {/each}
                                     </div>