feat: refactor MailViewer component path

frontend/src/routes/(app)/+page.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-  import MailViewer from "$lib/components/dashboard/MailViewer.svelte";
+  import MailViewer from "$lib/components/MailViewer.svelte";
   import { mailState } from "$lib/stores/mail-state.svelte";
 
   let { data } = $props();

frontend/src/routes/(app)/+page.ts

@@ -2,7 +2,6 @@ import { redirect } from '@sveltejs/kit';
 import type { PageLoad } from './$types';
 import { GetViewerData, GetStartupFile, ReadEML, ReadMSG } from '$lib/wailsjs/go/main/App';
 import DOMPurify from 'dompurify';
-import { settingsStore } from '$lib/stores/settings.svelte';
 import type { internal } from '$lib/wailsjs/go/models';
 
 export const load: PageLoad = async () => {

frontend/src/routes/(app)/settings/+page.svelte

@@ -6,7 +6,7 @@
   import { Label } from "$lib/components/ui/label";
   import { Separator } from "$lib/components/ui/separator";
   import { Switch } from "$lib/components/ui/switch";
-  import { ChevronLeft, Command, Option, Flame } from "@lucide/svelte";
+  import { ChevronLeft, Flame } from "@lucide/svelte";
   import type { EMLy_GUI_Settings } from "$lib/types";
   import { toast } from "svelte-sonner";
   import { It, Us } from "svelte-flags";