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, 9 insertions, 9 deletions

diff --git a/src/routes/events/+page.svelte b/src/routes/events/+page.svelte
index 0474852b..4fa734bd 100644
--- a/src/routes/events/+page.svelte
+++ b/src/routes/events/+page.svelte
@@ -1,6 +1,6 @@
 <script>
-import Spacer from "$lib/Layout/Spacer.svelte";
 import Event from "$lib/Events/Event.svelte";
+import Spacer from "$lib/Layout/Spacer.svelte";
 import Message from "$lib/Loading/Message.svelte";
 
 import root from "$lib/Utility/root";
diff --git a/src/routes/events/group/[group]/+page.svelte b/src/routes/events/group/[group]/+page.svelte
index 34db0fae..f7ca8769 100644
--- a/src/routes/events/group/[group]/+page.svelte
+++ b/src/routes/events/group/[group]/+page.svelte
@@ -1,12 +1,12 @@
 <script lang="ts">
-import Spacer from "$lib/Layout/Spacer.svelte";
-import type { Group as GroupType } from "$lib/Database/SB/groups.js";
+import { onMount } from "svelte";
 import type { Event as EventType } from "$lib/Database/SB/events.js";
+import type { Group as GroupType } from "$lib/Database/SB/groups.js";
+import Event from "$lib/Events/Event.svelte";
+import Group from "$lib/Events/Group.svelte";
+import Spacer from "$lib/Layout/Spacer.svelte";
 import Message from "$lib/Loading/Message.svelte";
 import root from "$lib/Utility/root";
-import { onMount } from "svelte";
-import Group from "$lib/Events/Group.svelte";
-import Event from "$lib/Events/Event.svelte";
 import locale from "$stores/locale";
 import type { PageData } from "./$types";
 
diff --git a/src/routes/events/groups/+page.svelte b/src/routes/events/groups/+page.svelte
index 198c637b..f0c0f44b 100644
--- a/src/routes/events/groups/+page.svelte
+++ b/src/routes/events/groups/+page.svelte
@@ -1,10 +1,10 @@
 <script lang="ts">
-import Spacer from "$lib/Layout/Spacer.svelte";
+import { onMount } from "svelte";
 import type { Group as GroupType } from "$lib/Database/SB/groups";
+import Group from "$lib/Events/Group.svelte";
+import Spacer from "$lib/Layout/Spacer.svelte";
 import Message from "$lib/Loading/Message.svelte";
 import root from "$lib/Utility/root";
-import { onMount } from "svelte";
-import Group from "$lib/Events/Group.svelte";
 import locale from "$stores/locale";
 
 let groupsResponse: Promise<Response>;