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/admin/duplicates/+page.svelte

@@ -1,17 +1,17 @@
 <script lang="ts">
-  import { pageTitle } from '$lib/branding';
+  import { pageTitle } from '#lib/branding.js';
   import { Copy, TriangleAlert } from 'lucide-svelte';
   import {
     createDuplicatesQuery,
     runDuplicateSweep,
     dismissDuplicateGroup,
     mergeDuplicateGroup
-  } from '$lib/api/admin';
-  import { errMessage } from '$lib/api/errors';
-  import { pushToast } from '$lib/stores/toast.svelte';
-  import { relativeTime } from '$lib/utils/relativeTime';
-  import type { AdminDuplicateGroup, AdminDuplicateMember } from '$lib/api/types';
-  import FingerprintSettingsCard from '$lib/components/FingerprintSettingsCard.svelte';
+  } from '#lib/api/admin.js';
+  import { errMessage } from '#lib/api/errors.js';
+  import { pushToast } from '#lib/stores/toast.svelte.js';
+  import { relativeTime } from '#lib/utils/relativeTime.js';
+  import type { AdminDuplicateGroup, AdminDuplicateMember } from '#lib/api/types.js';
+  import FingerprintSettingsCard from '#lib/components/FingerprintSettingsCard.svelte';
 
   // Tracks the duplicate sweep believes hold one recording (#3912). Dismissing a
   // group says "these are not duplicates", and the sweep will not propose that

web/src/routes/admin/duplicates/duplicates.test.ts

@@ -1,9 +1,9 @@
 import { afterEach, describe, expect, test, vi } from 'vitest';
 import { fireEvent, render, screen } from '@testing-library/svelte';
 import { mockQuery } from '../../../test-utils/query';
-import type { AdminDuplicatesResponse } from '$lib/api/types';
+import type { AdminDuplicatesResponse } from '#lib/api/types.js';
 
-vi.mock('$lib/api/admin', () => ({
+vi.mock('#lib/api/admin.js', () => ({
   createDuplicatesQuery: vi.fn(),
   runDuplicateSweep: vi.fn().mockResolvedValue({ started: true }),
   dismissDuplicateGroup: vi.fn().mockResolvedValue(undefined),
@@ -29,7 +29,7 @@ import {
   dismissDuplicateGroup,
   mergeDuplicateGroup,
   runDuplicateSweep
-} from '$lib/api/admin';
+} from '#lib/api/admin.js';
 
 const HOUR = 3_600_000;
 const ago = (ms: number) => new Date(Date.now() - ms).toISOString();