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, 7 deletions

diff --git a/src/routes/settings/+page.svelte b/src/routes/settings/+page.svelte
index f9a2ee87..79642944 100644
--- a/src/routes/settings/+page.svelte
+++ b/src/routes/settings/+page.svelte
@@ -1,18 +1,17 @@
 <script lang="ts">
+import LogInRestricted from "$lib/Error/LogInRestricted.svelte";
+import HeadTitle from "$lib/Home/HeadTitle.svelte";
 import Spacer from "$lib/Layout/Spacer.svelte";
-
 import Attributions from "$lib/Settings/Categories/Attributions.svelte";
-import HeadTitle from "$lib/Home/HeadTitle.svelte";
-import Display from "$lib/Settings/Categories/Display.svelte";
+import Cache from "$lib/Settings/Categories/Cache.svelte";
 import Calculation from "$lib/Settings/Categories/Calculation.svelte";
 import Debug from "$lib/Settings/Categories/Debug.svelte";
-import Cache from "$lib/Settings/Categories/Cache.svelte";
+import Display from "$lib/Settings/Categories/Display.svelte";
+import RssFeeds from "$lib/Settings/Categories/RSSFeeds.svelte";
+import SettingSync from "$lib/Settings/Categories/SettingSync.svelte";
 import Category from "$lib/Settings/Category.svelte";
 import tooltip from "$lib/Tooltip/tooltip";
 import locale from "$stores/locale.js";
-import LogInRestricted from "$lib/Error/LogInRestricted.svelte";
-import SettingSync from "$lib/Settings/Categories/SettingSync.svelte";
-import RssFeeds from "$lib/Settings/Categories/RSSFeeds.svelte";
 import type { PageData } from "./$types";
 
 export let data: PageData;