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.

2 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/Database/IDB/activities.ts b/src/lib/Database/IDB/activities.ts
index 3aaf1d61..15d9ccbc 100644
--- a/src/lib/Database/IDB/activities.ts
+++ b/src/lib/Database/IDB/activities.ts
@@ -1,5 +1,5 @@
-import type { ActivitiesPage } from "$lib/Data/AniList/activity";
 import Dexie, { type Table } from "dexie";
+import type { ActivitiesPage } from "$lib/Data/AniList/activity";
 
 export interface ActivityPage {
 	page: number;
diff --git a/src/lib/Database/IDB/user.ts b/src/lib/Database/IDB/user.ts
index 1158a8ff..23e274d4 100644
--- a/src/lib/Database/IDB/user.ts
+++ b/src/lib/Database/IDB/user.ts
@@ -1,5 +1,5 @@
-import type { AniListAuthorisation } from "$lib/Data/AniList/identity";
 import Dexie, { type Table } from "dexie";
+import type { AniListAuthorisation } from "$lib/Data/AniList/identity";
 
 export interface User {
 	id: number;