style: apply biome autofixes and resolve remaining lint findingsHEADmain

Auto-fixed cosmetic findings (import ordering, obj["k"]->obj.k, optional
chaining, template literals, Date.now, parseInt radix, useless ternaries/
switch cases). Resolved the non-autofixable rest by hand:

- Senpy: static-only class -> object literal (no this/static reliance).
- app.html: var global shim -> window.global = window (keeps the shim,
  drops the unused-var flag).
- biome-ignore with rationale for the logout document.cookie clear and the
  holodule scrape non-null assertion.

Verified: biome check 0 diagnostics, svelte-check 0/0, 24/24 unit tests.

3 files changed, 7 insertions, 7 deletions

diff --git a/src/lib/Home/HeadTitle.svelte b/src/lib/Home/HeadTitle.svelte
index 73cf3e3d..228304b4 100644
--- a/src/lib/Home/HeadTitle.svelte
+++ b/src/lib/Home/HeadTitle.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
+import type { Locale } from "$lib/Locale/layout";
 import { siteUrl } from "$lib/Utility/appOrigin";
 import locale from "$stores/locale";
-import type { Locale } from "$lib/Locale/layout";
 
 type HeadTitleKey = keyof NonNullable<Locale["headTitle"]>;
 
@@ -18,7 +18,7 @@ let {
 const resolved = $derived(
 	routeKey ? ($locale().headTitle?.[routeKey] ?? routeKey) : route,
 );
-const title = $derived((resolved ? `${resolved} • ` : "") + "due.moe");
+const title = $derived(`${resolved ? `${resolved} • ` : ""}due.moe`);
 </script>
 
 <svelte:head>
diff --git a/src/lib/Home/LastActivity.svelte b/src/lib/Home/LastActivity.svelte
index 1b4952f8..6a8c3f6a 100644
--- a/src/lib/Home/LastActivity.svelte
+++ b/src/lib/Home/LastActivity.svelte
@@ -1,11 +1,11 @@
 <script lang="ts">
-import userIdentity from "$stores/identity";
 import { onMount } from "svelte";
+import { get } from "svelte/store";
 import type { AniListAuthorisation } from "$lib/Data/AniList/identity";
-import { lastActivityDate } from "../Data/AniList/lastActivity";
-import settings from "$stores/settings";
+import userIdentity from "$stores/identity";
 import locale from "$stores/locale";
-import { get } from "svelte/store";
+import settings from "$stores/settings";
+import { lastActivityDate } from "../Data/AniList/lastActivity";
 
 let { user }: { user: AniListAuthorisation } = $props();
 let lastActivityWasToday = $state(true);
diff --git a/src/lib/Home/Root.svelte b/src/lib/Home/Root.svelte
index 32a86761..793a0151 100644
--- a/src/lib/Home/Root.svelte
+++ b/src/lib/Home/Root.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
-import settings from "$stores/settings";
 import { fly } from "svelte/transition";
+import settings from "$stores/settings";
 
 export let data: { url: string };
 export let way: number;