chore(deps): SvelteKit 3 with adapter-static 4 and TypeScript 6, full-tree npm audit (#5021)

Merges Renovate's kit 3 (PR #149) and adapter-static 4 (PR #148) bumps,
plus the migration they need. The mechanical part is `sv migrate
sveltekit-3`, run one task at a time and reviewed:

- svelte.config.js is gone. Its options move into sveltekit() in
  vite.config.ts, exported as kitOptions so vitest.config.ts runs the
  same kit setup, including the $test-utils alias the tests import.
- $lib becomes #lib through package.json "imports". There is no
  src/lib/index, so only the "#lib/*" entry is kept.
- tsconfig extends $app/tsconfig.
- Peer floors raised to kit 3's requirements: svelte ^5.57.1, vite
  ^8.0.12, svelte-check ^4.7.5.

By hand, from the codemod's list of non-automated tasks:

- goto's replaceState option is now replace; keepFocus becomes
  reset: false. For the search typeahead, reset: false also stops the
  scroll-to-top, which is wanted while typing.
- The test setup mocks drop pushState/replaceState and $app/paths
  base/assets, which kit 3 removed, and mock refreshAll in place of
  invalidateAll.
- The other flagged files only read page.url or goto internal routes,
  so they needed no change.

TypeScript goes to ^6, not the ^7 Renovate offers: kit 3 declares
typescript ^6 as a peer and svelte-check 4.7 accepts ^5 || ^6. Move to
7 once both accept it.

With Tailwind 4 and kit 3 in, `npm audit` on the whole tree reports 0,
so the web lane now audits every dependency rather than only what
ships to browsers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/routes/library/history/page.test.ts

@@ -1,7 +1,7 @@
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { render, screen } from '@testing-library/svelte';
 import HistoryPage from './+page.svelte';
-import type { HistoryEvent, HistoryResponse } from '$lib/api/history';
+import type { HistoryEvent, HistoryResponse } from '#lib/api/history.js';
 import { makeTrack } from '$test-utils/fixtures/track';
 
 const mkTrack = (id: string) => makeTrack({ id: `track-${id}`, title: `Song ${id}` });
@@ -20,9 +20,9 @@ let mockIsFetchingNextPage = false;
 const mockFetchNextPage = vi.fn();
 const mockRefetch = vi.fn();
 
-vi.mock('$lib/api/history', async () => {
-  const actual = await vi.importActual<typeof import('$lib/api/history')>(
-    '$lib/api/history'
+vi.mock('#lib/api/history.js', async () => {
+  const actual = await vi.importActual<typeof import('#lib/api/history.js')>(
+    '#lib/api/history.js'
   );
   return {
     ...actual,
@@ -44,11 +44,11 @@ vi.mock('$lib/api/history', async () => {
   };
 });
 
-vi.mock('$lib/player/store.svelte', () => ({
+vi.mock('#lib/player/store.svelte.js', () => ({
   playQueue: vi.fn()
 }));
 
-vi.mock('$lib/branding', () => ({
+vi.mock('#lib/branding.js', () => ({
   pageTitle: (s: string) => `Minstrel · ${s}`
 }));