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.

1 files changed, 6 insertions, 6 deletions

diff --git a/src/routes/hololive/[[stream]]/+page.svelte b/src/routes/hololive/[[stream]]/+page.svelte
index 250ce22a..38969b45 100644
--- a/src/routes/hololive/[[stream]]/+page.svelte
+++ b/src/routes/hololive/[[stream]]/+page.svelte
@@ -1,15 +1,15 @@
 <script lang="ts">
 import { onMount } from "svelte";
+import { parseScheduleHtml } from "$lib/Data/hololive";
+import { typeSchedule } from "$lib/Hololive/hololive";
+import Lives from "$lib/Hololive/Lives.svelte";
+import HeadTitle from "$lib/Home/HeadTitle.svelte";
 import Message from "$lib/Loading/Message.svelte";
 import Skeleton from "$lib/Loading/Skeleton.svelte";
-import HeadTitle from "$lib/Home/HeadTitle.svelte";
-import { parseScheduleHtml } from "$lib/Data/hololive";
 import proxy from "$lib/Utility/proxy";
-import locale from "$stores/locale";
 import root from "$lib/Utility/root";
 import identity from "$stores/identity";
-import Lives from "$lib/Hololive/Lives.svelte";
-import { typeSchedule } from "$lib/Hololive/hololive";
+import locale from "$stores/locale";
 import type { PageData } from "./$types";
 
 export let data: PageData;
@@ -35,7 +35,7 @@ const getPinnedStreams = () => {
 		fetch(root(`/api/preferences?id=${$identity.id}`)).then((response) => {
 			if (response.ok)
 				response.json().then((data) => {
-					if (data && data.pinned_hololive_streams)
+					if (data?.pinned_hololive_streams)
 						streams = data.pinned_hololive_streams;
 
 					setSchedule();