diff --git a/tests/unit/admin-providers-validation.spec.ts b/tests/unit/admin-providers-validation.vitest.spec.ts
similarity index 97%
rename from tests/unit/admin-providers-validation.spec.ts
rename to tests/unit/admin-providers-validation.vitest.spec.ts
index ca3b68b..e977cc7 100644
--- a/tests/unit/admin-providers-validation.spec.ts
+++ b/tests/unit/admin-providers-validation.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { inArray } from 'drizzle-orm';
 import { db } from '../../src/db';
 import { adminProviders } from '../../src/db/schema';
@@ -12,7 +12,7 @@ import {
   type AdminProviderRecord,
 } from '../../src/lib/server/admin/providers';
 
-test.describe('admin provider validation', () => {
+describe('admin provider validation', () => {
   test('normalizes valid slugs to lowercase', () => {
     expect(validateSlug('My-Provider-1')).toBe('my-provider-1');
   });
diff --git a/tests/unit/admin-tts-instructions.spec.ts b/tests/unit/admin-tts-instructions.vitest.spec.ts
similarity index 92%
rename from tests/unit/admin-tts-instructions.spec.ts
rename to tests/unit/admin-tts-instructions.vitest.spec.ts
index 0a7198e..11e06e8 100644
--- a/tests/unit/admin-tts-instructions.spec.ts
+++ b/tests/unit/admin-tts-instructions.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { resolveEffectiveTtsInstructions } from '../../src/lib/server/admin/tts-instructions';
 
-test.describe('resolveEffectiveTtsInstructions', () => {
+describe('resolveEffectiveTtsInstructions', () => {
   test('uses explicit request instructions when model supports them', () => {
     const out = resolveEffectiveTtsInstructions({
       model: 'gpt-4o-mini-tts',
diff --git a/tests/unit/audiobook-scope.spec.ts b/tests/unit/audiobook-scope.vitest.spec.ts
similarity index 93%
rename from tests/unit/audiobook-scope.spec.ts
rename to tests/unit/audiobook-scope.vitest.spec.ts
index b73ba40..ca9705b 100644
--- a/tests/unit/audiobook-scope.spec.ts
+++ b/tests/unit/audiobook-scope.vitest.spec.ts
@@ -1,7 +1,7 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { buildAllowedAudiobookUserIds, pickAudiobookOwner } from '../../src/lib/server/audiobooks/user-scope';
 
-test.describe('audiobook scope selection', () => {
+describe('audiobook scope selection', () => {
   test('uses only unclaimed scope when auth is disabled', () => {
     const result = buildAllowedAudiobookUserIds(false, null, 'unclaimed::ns');
     expect(result.preferredUserId).toBe('unclaimed::ns');
diff --git a/tests/unit/audiobook-settings.spec.ts b/tests/unit/audiobook-settings.vitest.spec.ts
similarity index 96%
rename from tests/unit/audiobook-settings.spec.ts
rename to tests/unit/audiobook-settings.vitest.spec.ts
index af3c788..1cc371c 100644
--- a/tests/unit/audiobook-settings.spec.ts
+++ b/tests/unit/audiobook-settings.vitest.spec.ts
@@ -1,10 +1,10 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   canonicalizeAudiobookSettingsForRuntime,
   coerceAudiobookGenerationSettings,
 } from '../../src/lib/server/audiobooks/settings';
 
-test.describe('coerceAudiobookGenerationSettings', () => {
+describe('coerceAudiobookGenerationSettings', () => {
   test('accepts current metadata shape without migration', () => {
     const result = coerceAudiobookGenerationSettings({
       providerRef: 'openai',
diff --git a/tests/unit/audiobook.spec.ts b/tests/unit/audiobook.vitest.spec.ts
similarity index 95%
rename from tests/unit/audiobook.spec.ts
rename to tests/unit/audiobook.vitest.spec.ts
index 53417a2..0533385 100644
--- a/tests/unit/audiobook.spec.ts
+++ b/tests/unit/audiobook.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { 
   escapeFFMetadata,
   encodeChapterTitleTag,
@@ -7,7 +7,7 @@ import {
   decodeChapterFileName
 } from '../../src/lib/server/audiobooks/chapters';
 
-test.describe('escapeFFMetadata', () => {
+describe('escapeFFMetadata', () => {
   test('escapes special characters correctly', () => {
     const input = 'Title with = ; # and backslash \\';
     // Expected: Equal -> \=, Semicolon -> \;, Hash -> \#, Backslash -> \\
@@ -37,7 +37,7 @@ test.describe('escapeFFMetadata', () => {
   });
 });
 
-test.describe('Title Tags', () => {
+describe('Title Tags', () => {
   test('encodeChapterTitleTag formats correctly', () => {
     expect(encodeChapterTitleTag(0, 'Intro')).toBe('0001 - Intro');
     expect(encodeChapterTitleTag(9, 'Chapter Ten')).toBe('0010 - Chapter Ten');
@@ -63,7 +63,7 @@ test.describe('Title Tags', () => {
   });
 });
 
-test.describe('Chapter File Names', () => {
+describe('Chapter File Names', () => {
   test('encodeChapterFileName formats correctly', () => {
     expect(encodeChapterFileName(0, 'Intro', 'mp3')).toBe('0001__Intro.mp3');
     expect(encodeChapterFileName(1, 'Part 2', 'm4b')).toBe('0002__Part%202.m4b');
diff --git a/tests/unit/audiobooks-blobstore.spec.ts b/tests/unit/audiobooks-blobstore.vitest.spec.ts
similarity index 95%
rename from tests/unit/audiobooks-blobstore.spec.ts
rename to tests/unit/audiobooks-blobstore.vitest.spec.ts
index 198b2bf..5f2c917 100644
--- a/tests/unit/audiobooks-blobstore.spec.ts
+++ b/tests/unit/audiobooks-blobstore.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   audiobookKey,
   audiobookPrefix,
@@ -14,7 +14,7 @@ function configureS3Env() {
   process.env.S3_PREFIX = 'openreader-test';
 }
 
-test.describe('audiobooks-blobstore', () => {
+describe('audiobooks-blobstore', () => {
   test.beforeAll(() => {
     configureS3Env();
   });
diff --git a/tests/unit/changelog-check.spec.ts b/tests/unit/changelog-check.vitest.spec.ts
similarity index 95%
rename from tests/unit/changelog-check.spec.ts
rename to tests/unit/changelog-check.vitest.spec.ts
index f95bcbc..19d8642 100644
--- a/tests/unit/changelog-check.spec.ts
+++ b/tests/unit/changelog-check.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { scheduleChangelogCheck } from '../../src/lib/client/changelog-check';
 
@@ -6,7 +6,7 @@ function wait(ms: number): Promise<void> {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }
 
-test.describe('changelog check scheduling', () => {
+describe('changelog check scheduling', () => {
   test('cancels throwaway mount and runs exactly once on remount', async () => {
     const completedRef = { current: null as string | null };
     const inFlightRef = { current: null as string | null };
diff --git a/tests/unit/changelog.spec.ts b/tests/unit/changelog.vitest.spec.ts
similarity index 96%
rename from tests/unit/changelog.spec.ts
rename to tests/unit/changelog.vitest.spec.ts
index 02117d9..3d56744 100644
--- a/tests/unit/changelog.spec.ts
+++ b/tests/unit/changelog.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   findCurrentVersionIndex,
@@ -10,7 +10,7 @@ import {
   type ChangelogManifestEntry,
 } from '../../src/lib/shared/changelog';
 
-test.describe('changelog utilities', () => {
+describe('changelog utilities', () => {
   test('normalizes version strings with and without v prefix', () => {
     expect(normalizeVersion('v2.2.0')).toBe('2.2.0');
     expect(normalizeVersion('2.2.0')).toBe('2.2.0');
diff --git a/tests/unit/document-previews-render.spec.ts b/tests/unit/document-previews-render.vitest.spec.ts
similarity index 90%
rename from tests/unit/document-previews-render.spec.ts
rename to tests/unit/document-previews-render.vitest.spec.ts
index 85f6a31..c82ed75 100644
--- a/tests/unit/document-previews-render.spec.ts
+++ b/tests/unit/document-previews-render.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import path from 'path';
 import { readFile } from 'fs/promises';
 import {
@@ -6,7 +6,7 @@ import {
   renderPdfFirstPageToJpeg,
 } from '../../src/lib/server/documents/previews-render';
 
-test.describe('document-previews-render', () => {
+describe('document-previews-render', () => {
   test('renders first PDF page to JPEG preview', async () => {
     const pdfPath = path.join(process.cwd(), 'tests/files/sample.pdf');
     const bytes = await readFile(pdfPath);
diff --git a/tests/unit/epub-audiobook-hook.spec.ts b/tests/unit/epub-audiobook-hook.vitest.spec.ts
similarity index 94%
rename from tests/unit/epub-audiobook-hook.spec.ts
rename to tests/unit/epub-audiobook-hook.vitest.spec.ts
index 8efd21b..309eb4e 100644
--- a/tests/unit/epub-audiobook-hook.spec.ts
+++ b/tests/unit/epub-audiobook-hook.vitest.spec.ts
@@ -1,11 +1,11 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   filterNonEmptySpineTextEntries,
   resolveLoadedSpineSectionDocument,
 } from '../../src/hooks/epub/useEPUBAudiobook';
 
-test.describe('EPUB audiobook hook helpers', () => {
+describe('EPUB audiobook hook helpers', () => {
   test('resolveLoadedSpineSectionDocument prefers ownerDocument when available', () => {
     const ownerDocument = { body: { textContent: 'from ownerDocument' } } as unknown as Document;
     const loaded = { ownerDocument } as unknown;
diff --git a/tests/unit/epub-location-controller.spec.ts b/tests/unit/epub-location-controller.vitest.spec.ts
similarity index 92%
rename from tests/unit/epub-location-controller.spec.ts
rename to tests/unit/epub-location-controller.vitest.spec.ts
index ca165a7..c784eab 100644
--- a/tests/unit/epub-location-controller.spec.ts
+++ b/tests/unit/epub-location-controller.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   isDirectionalEpubLocation,
@@ -6,7 +6,7 @@ import {
   shouldPersistEpubLocation,
 } from '../../src/hooks/epub/useEPUBLocationController';
 
-test.describe('EPUB location controller helpers', () => {
+describe('EPUB location controller helpers', () => {
   test('detects directional locations', () => {
     expect(isDirectionalEpubLocation('next')).toBe(true);
     expect(isDirectionalEpubLocation('prev')).toBe(true);
diff --git a/tests/unit/epub-spine-coordinates.spec.ts b/tests/unit/epub-spine-coordinates.vitest.spec.ts
similarity index 97%
rename from tests/unit/epub-spine-coordinates.spec.ts
rename to tests/unit/epub-spine-coordinates.vitest.spec.ts
index 2d8b9a5..eca51e3 100644
--- a/tests/unit/epub-spine-coordinates.spec.ts
+++ b/tests/unit/epub-spine-coordinates.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import type { Book } from 'epubjs';
 import {
   buildEpubLocator,
@@ -71,7 +71,7 @@ function makeFakeBook(items: Array<{ index: number; href: string; cfiBase: strin
   return { book, sections };
 }
 
-test.describe('findSegmentOffset', () => {
+describe('findSegmentOffset', () => {
   test('finds an offset for matching text', () => {
     const spineText = 'Hello world. This is a test paragraph for offsets.';
     const offset = findSegmentOffset(spineText, 'this is a test');
@@ -98,7 +98,7 @@ test.describe('findSegmentOffset', () => {
   });
 });
 
-test.describe('resolveSpineFromCfi', () => {
+describe('resolveSpineFromCfi', () => {
   test('returns spine identity for a CFI inside a known spine', () => {
     const { book } = makeFakeBook([
       { index: 2, href: 'OEBPS/ch02.xhtml', cfiBase: '/6/4', text: 'chapter 2 contents' },
@@ -125,7 +125,7 @@ test.describe('resolveSpineFromCfi', () => {
   });
 });
 
-test.describe('buildEpubLocator', () => {
+describe('buildEpubLocator', () => {
   test('produces a stable locator with charOffset within the spine item', async () => {
     const { book } = makeFakeBook([
       {
@@ -175,7 +175,7 @@ test.describe('buildEpubLocator', () => {
   });
 });
 
-test.describe('buildEpubLocatorFromChunk', () => {
+describe('buildEpubLocatorFromChunk', () => {
   test('uses the chunk anchor offset as a hint to disambiguate repeated text', () => {
     const spineText = 'foo bar foo bar foo bar';
     const anchorEarly = {
@@ -230,7 +230,7 @@ test.describe('buildEpubLocatorFromChunk', () => {
   });
 });
 
-test.describe('buildEpubLocator anchored-search regression', () => {
+describe('buildEpubLocator anchored-search regression', () => {
   // Pins the contract for the server-side resolver path: when called with
   // a `chunkText` argument representing the current rendered page, the
   // returned locator's `charOffset` is **at or after** the chunk's position
@@ -261,7 +261,7 @@ test.describe('buildEpubLocator anchored-search regression', () => {
   });
 });
 
-test.describe('findSegmentOffset fallback contract', () => {
+describe('findSegmentOffset fallback contract', () => {
   // These tests pin the documented behavior of `findSegmentOffset`. The
   // from-start fallback is correct for single-shot lookups but **wrong** in
   // a monotonic per-sentence walk — `resolveMonotonicSentenceOffsets` exists
@@ -278,7 +278,7 @@ test.describe('findSegmentOffset fallback contract', () => {
   });
 });
 
-test.describe('resolveMonotonicSentenceOffsets', () => {
+describe('resolveMonotonicSentenceOffsets', () => {
   test('returns monotonically non-decreasing offsets for sentences in order', () => {
     const spineText = 'The cat sat on the mat. The dog barked loudly. Then it was quiet.';
     const sentences = [
@@ -347,7 +347,7 @@ test.describe('resolveMonotonicSentenceOffsets', () => {
   });
 });
 
-test.describe('getSpineItemPlainText shape handling', () => {
+describe('getSpineItemPlainText shape handling', () => {
   // Regression: epubjs's `Section.load()` resolves to the spine item's
   // `<html>` Element (NOT a Document). Reading `loaded.body` directly was
   // returning undefined for every spine item, so spineText came back ''
diff --git a/tests/unit/epub-word-highlight.spec.ts b/tests/unit/epub-word-highlight.vitest.spec.ts
similarity index 95%
rename from tests/unit/epub-word-highlight.spec.ts
rename to tests/unit/epub-word-highlight.vitest.spec.ts
index dc9720a..8899dc8 100644
--- a/tests/unit/epub-word-highlight.spec.ts
+++ b/tests/unit/epub-word-highlight.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   buildMonotonicWordToTokenMap,
@@ -27,7 +27,7 @@ const alignmentWords = (words: string[]): TTSSentenceAlignment['words'] =>
     charEnd: word.length,
   }));
 
-test.describe('EPUB word highlight mapping', () => {
+describe('EPUB word highlight mapping', () => {
   test('tokenizes canonical segment words with source offsets', () => {
     const tokens = tokenizeCanonicalSegment(segment('"Hello," she said.', 12));
 
diff --git a/tests/unit/icons-grid.spec.ts b/tests/unit/icons-grid.vitest.spec.ts
similarity index 91%
rename from tests/unit/icons-grid.spec.ts
rename to tests/unit/icons-grid.vitest.spec.ts
index 5663c47..c21f95b 100644
--- a/tests/unit/icons-grid.spec.ts
+++ b/tests/unit/icons-grid.vitest.spec.ts
@@ -1,7 +1,7 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { iconsGridStyle, maxColumnsForIconGrid } from '../../src/components/doclist/views/iconsGrid';
 
-test.describe('icons grid layout', () => {
+describe('icons grid layout', () => {
   test('calculates max columns from width and icon size', () => {
     expect(maxColumnsForIconGrid('md', 136)).toBe(1);
     expect(maxColumnsForIconGrid('md', 300)).toBe(2);
diff --git a/tests/unit/kokoro.spec.ts b/tests/unit/kokoro.vitest.spec.ts
similarity index 89%
rename from tests/unit/kokoro.spec.ts
rename to tests/unit/kokoro.vitest.spec.ts
index 3860c1f..5f1950a 100644
--- a/tests/unit/kokoro.spec.ts
+++ b/tests/unit/kokoro.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { getMaxVoicesForProvider } from '../../src/lib/shared/kokoro';
 
-test.describe('kokoro voice limits', () => {
+describe('kokoro voice limits', () => {
   test('keeps Replicate single-voice even for Kokoro models', () => {
     expect(getMaxVoicesForProvider('replicate', 'kokoro')).toBe(1);
     expect(getMaxVoicesForProvider('replicate', 'hexgrad/Kokoro-82M')).toBe(1);
diff --git a/tests/unit/nlp.spec.ts b/tests/unit/nlp.vitest.spec.ts
similarity index 96%
rename from tests/unit/nlp.spec.ts
rename to tests/unit/nlp.vitest.spec.ts
index ce65ef0..4753b20 100644
--- a/tests/unit/nlp.spec.ts
+++ b/tests/unit/nlp.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { 
   preprocessSentenceForAudio, 
   splitTextToTtsBlocks, 
@@ -18,7 +18,7 @@ const expectNormalizedBlocks = (blocks: string[], maxLen = Number.POSITIVE_INFIN
   }
 };
 
-test.describe('preprocessSentenceForAudio', () => {
+describe('preprocessSentenceForAudio', () => {
   test('normalizes common extraction artifacts', () => {
     const cases: Array<{ input: string; expected: string }> = [
       {
@@ -45,7 +45,7 @@ test.describe('preprocessSentenceForAudio', () => {
   });
 });
 
-test.describe('splitTextToTtsBlocks (PDF-oriented)', () => {
+describe('splitTextToTtsBlocks (PDF-oriented)', () => {
   test('returns [] for empty input', () => {
     expect(splitTextToTtsBlocks('')).toEqual([]);
     expect(splitTextToTtsBlocks('   ')).toEqual([]);
@@ -160,7 +160,7 @@ test.describe('splitTextToTtsBlocks (PDF-oriented)', () => {
   });
 });
 
-test.describe('splitTextToTtsBlocksEPUB (highlight-friendly)', () => {
+describe('splitTextToTtsBlocksEPUB (highlight-friendly)', () => {
   test('returns [] for empty input', () => {
     expect(splitTextToTtsBlocksEPUB('')).toEqual([]);
     expect(splitTextToTtsBlocksEPUB('   ')).toEqual([]);
@@ -193,7 +193,7 @@ test.describe('splitTextToTtsBlocksEPUB (highlight-friendly)', () => {
   });
 });
 
-test.describe('normalizeTextForTts', () => {
+describe('normalizeTextForTts', () => {
   test('returns a single normalized string without newlines', () => {
     const input = 'Hello.\nWorld.\n\nNext paragraph.';
     const normalized = normalizeTextForTts(input);
diff --git a/tests/unit/onboarding-flow.spec.ts b/tests/unit/onboarding-flow.vitest.spec.ts
similarity index 94%
rename from tests/unit/onboarding-flow.spec.ts
rename to tests/unit/onboarding-flow.vitest.spec.ts
index 9533aa8..27eaaa6 100644
--- a/tests/unit/onboarding-flow.spec.ts
+++ b/tests/unit/onboarding-flow.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { createCoalescedAsyncRunner, resolveNextOnboardingStep } from '../../src/lib/client/onboarding-flow';
 
-test.describe('onboarding flow resolver', () => {
+describe('onboarding flow resolver', () => {
   test('resolves deterministic order with privacy first', () => {
     const step = resolveNextOnboardingStep({
       privacyRequired: true,
@@ -78,7 +78,7 @@ test.describe('onboarding flow resolver', () => {
   });
 });
 
-test.describe('coalesced onboarding runner', () => {
+describe('coalesced onboarding runner', () => {
   test('coalesces concurrent triggers into one extra rerun', async () => {
     let runs = 0;
     let nestedRequested = false;
diff --git a/tests/unit/onboarding-state.spec.ts b/tests/unit/onboarding-state.vitest.spec.ts
similarity index 90%
rename from tests/unit/onboarding-state.spec.ts
rename to tests/unit/onboarding-state.vitest.spec.ts
index 9379c2a..c457b92 100644
--- a/tests/unit/onboarding-state.spec.ts
+++ b/tests/unit/onboarding-state.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { ONBOARDING_STATE_REGISTRY } from '../../src/lib/shared/onboarding-state';
 import { SYNCED_PREFERENCE_KEYS } from '../../src/types/user-state';
 
-test.describe('onboarding state storage scopes', () => {
+describe('onboarding state storage scopes', () => {
   test('keeps local onboarding flags out of synced server preferences', () => {
     expect(ONBOARDING_STATE_REGISTRY.privacyAccepted.scope).toBe('local-dexie');
     expect(ONBOARDING_STATE_REGISTRY.firstVisitSettingsOpened.scope).toBe('local-dexie');
diff --git a/tests/unit/sha256.spec.ts b/tests/unit/sha256.vitest.spec.ts
similarity index 91%
rename from tests/unit/sha256.spec.ts
rename to tests/unit/sha256.vitest.spec.ts
index 64796a3..1a44fec 100644
--- a/tests/unit/sha256.spec.ts
+++ b/tests/unit/sha256.vitest.spec.ts
@@ -1,10 +1,10 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { 
   sha256HexSoftwareFromBytes, 
   sha256HexFromString 
 } from '../../src/lib/client/sha256';
 
-test.describe('SHA256 Software Implementation', () => {
+describe('SHA256 Software Implementation', () => {
     // Known test vectors
     // "" -> e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
     // "abc" -> ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad
diff --git a/tests/unit/transfer-user-documents.spec.ts b/tests/unit/transfer-user-documents.vitest.spec.ts
similarity index 95%
rename from tests/unit/transfer-user-documents.spec.ts
rename to tests/unit/transfer-user-documents.vitest.spec.ts
index ca58e28..f1c0bed 100644
--- a/tests/unit/transfer-user-documents.spec.ts
+++ b/tests/unit/transfer-user-documents.vitest.spec.ts
@@ -1,11 +1,11 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import Database from 'better-sqlite3';
 import { drizzle } from 'drizzle-orm/better-sqlite3';
 import { eq } from 'drizzle-orm';
 import { documents } from '../../src/db/schema_sqlite';
 import { transferUserDocuments } from '../../src/lib/server/user/claim-data';
 
-test.describe('transferUserDocuments', () => {
+describe('transferUserDocuments', () => {
   test('moves document rows to new user without PK conflicts', async () => {
     process.env.BASE_URL = 'http://localhost:3003';
     process.env.AUTH_SECRET = 'test-secret';
diff --git a/tests/unit/tts-audio-warm-cache.spec.ts b/tests/unit/tts-audio-warm-cache.vitest.spec.ts
similarity index 97%
rename from tests/unit/tts-audio-warm-cache.spec.ts
rename to tests/unit/tts-audio-warm-cache.vitest.spec.ts
index 06a5d24..4f38c73 100644
--- a/tests/unit/tts-audio-warm-cache.spec.ts
+++ b/tests/unit/tts-audio-warm-cache.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   releaseWarmAudio,
   upsertWarmAudioEntry,
@@ -23,7 +23,7 @@ function createTrackedAudio() {
   return { audio, calls };
 }
 
-test.describe('tts warm audio cache helpers', () => {
+describe('tts warm audio cache helpers', () => {
   test('releaseWarmAudio clears source and invokes teardown methods', () => {
     const tracked = createTrackedAudio();
     releaseWarmAudio(tracked.audio);
diff --git a/tests/unit/tts-epub-handoff.spec.ts b/tests/unit/tts-epub-handoff.vitest.spec.ts
similarity index 97%
rename from tests/unit/tts-epub-handoff.spec.ts
rename to tests/unit/tts-epub-handoff.vitest.spec.ts
index 143e6e1..fa5fb82 100644
--- a/tests/unit/tts-epub-handoff.spec.ts
+++ b/tests/unit/tts-epub-handoff.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   completedEpubBoundarySegment,
@@ -23,7 +23,7 @@ const segment = (
   ...overrides,
 });
 
-test.describe('EPUB boundary handoff', () => {
+describe('EPUB boundary handoff', () => {
   test('records only completed segments that span a source boundary', () => {
     expect(completedEpubBoundarySegment(segment('same page'))).toBeNull();
 
diff --git a/tests/unit/tts-epub-preload.spec.ts b/tests/unit/tts-epub-preload.vitest.spec.ts
similarity index 94%
rename from tests/unit/tts-epub-preload.spec.ts
rename to tests/unit/tts-epub-preload.vitest.spec.ts
index d780e51..f74dd39 100644
--- a/tests/unit/tts-epub-preload.spec.ts
+++ b/tests/unit/tts-epub-preload.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import type { CanonicalTtsSourceUnit } from '../../src/lib/shared/tts-segment-plan';
 import {
@@ -6,7 +6,7 @@ import {
   selectUpcomingWalkerItems,
 } from '../../src/lib/client/epub/tts-epub-preload';
 
-test.describe('EPUB walker preload helpers', () => {
+describe('EPUB walker preload helpers', () => {
   test('selectUpcomingWalkerItems honors depth as current + (depth-1) upcoming', () => {
     const items = [
       { cfi: 'epubcfi(/6/2[;s=a]!/4/2)' }, // same as current after normalization
diff --git a/tests/unit/tts-generate.spec.ts b/tests/unit/tts-generate.vitest.spec.ts
similarity index 92%
rename from tests/unit/tts-generate.spec.ts
rename to tests/unit/tts-generate.vitest.spec.ts
index 364f6f2..a601952 100644
--- a/tests/unit/tts-generate.spec.ts
+++ b/tests/unit/tts-generate.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { extractReplicateAudioUrl } from '../../src/lib/server/tts/generate';
 
-test.describe('replicate output URL extraction', () => {
+describe('replicate output URL extraction', () => {
   test('returns direct URL string output', () => {
     expect(extractReplicateAudioUrl('https://replicate.delivery/audio.mp3')).toBe(
       'https://replicate.delivery/audio.mp3'
diff --git a/tests/unit/tts-locator.spec.ts b/tests/unit/tts-locator.vitest.spec.ts
similarity index 96%
rename from tests/unit/tts-locator.spec.ts
rename to tests/unit/tts-locator.vitest.spec.ts
index 19e0eee..6e8b32c 100644
--- a/tests/unit/tts-locator.spec.ts
+++ b/tests/unit/tts-locator.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   compareSegmentLocators,
   locatorGroupKey,
@@ -25,7 +25,7 @@ const epubLocator = (
   ...(cfi ? { cfi } : {}),
 });
 
-test.describe('locatorGroupKey', () => {
+describe('locatorGroupKey', () => {
   test('groups stable EPUB locators by spine index and href', () => {
     expect(locatorGroupKey(epubLocator('OEBPS/ch02.xhtml', 2, 0))).toBe('epub:2:OEBPS/ch02.xhtml');
     // Different charOffset, same spine → same group (sidebar bucket is chapter-sized).
@@ -55,7 +55,7 @@ test.describe('locatorGroupKey', () => {
   });
 });
 
-test.describe('locatorIdentityKey', () => {
+describe('locatorIdentityKey', () => {
   test('two EPUB rows in the same chapter at different charOffsets get distinct identity keys', () => {
     // This is the bug that caused page-N rows to swallow page-(N+1) rows in
     // the server-side manifest aggregator: the previous code keyed by the
@@ -82,7 +82,7 @@ test.describe('locatorIdentityKey', () => {
   });
 });
 
-test.describe('compareSegmentLocators', () => {
+describe('compareSegmentLocators', () => {
   test('orders EPUB rows by spineIndex then charOffset numerically', () => {
     // Spine 10 must come AFTER spine 2 — a lexicographic compare would
     // wrongly place "10" before "2".
@@ -137,7 +137,7 @@ test.describe('compareSegmentLocators', () => {
   });
 });
 
-test.describe('type guards', () => {
+describe('type guards', () => {
   test('isStableEpubLocator requires all spine fields', () => {
     expect(isStableEpubLocator(epubLocator('a.xhtml', 0, 0))).toBe(true);
     expect(isStableEpubLocator({ readerType: 'epub', spineHref: 'a.xhtml' })).toBe(false);
@@ -159,7 +159,7 @@ test.describe('type guards', () => {
   });
 });
 
-test.describe('normalizeEpubLocationToken', () => {
+describe('normalizeEpubLocationToken', () => {
   test('strips whitespace and step markers but preserves identity', () => {
     const a = normalizeEpubLocationToken('epubcfi(/6/8!/4:0)');
     const b = normalizeEpubLocationToken('  epubcfi(/6/8[;s=a]!/4:0)  ');
diff --git a/tests/unit/tts-provider-catalog.spec.ts b/tests/unit/tts-provider-catalog.vitest.spec.ts
similarity index 99%
rename from tests/unit/tts-provider-catalog.spec.ts
rename to tests/unit/tts-provider-catalog.vitest.spec.ts
index 3c40372..334ea16 100644
--- a/tests/unit/tts-provider-catalog.spec.ts
+++ b/tests/unit/tts-provider-catalog.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   REPLICATE_KOKORO_82M_VERSIONED_MODEL,
@@ -13,7 +13,7 @@ import { resolveReplicateVoiceInputKey, resolveVoices } from '../../src/lib/serv
 import { applyConfigUpdate, getVoicePreferenceKey } from '../../src/lib/client/config/updates';
 import { buildSyncedPreferencePatch } from '../../src/lib/client/config/preferences';
 
-test.describe('tts provider catalog', () => {
+describe('tts provider catalog', () => {
   test('resolves provider models with fixed Deepinfra catalog', () => {
     expect(resolveProviderModels('openai').map((model) => model.id)).toEqual([
       'tts-1',
@@ -389,7 +389,7 @@ test.describe('tts provider catalog', () => {
   });
 });
 
-test.describe('config helpers', () => {
+describe('config helpers', () => {
   test('persists voice preferences by provider/model pair', () => {
     expect(getVoicePreferenceKey('openai', 'tts-1')).toBe('openai:tts-1');
 
diff --git a/tests/unit/tts-segment-audio-urls.spec.ts b/tests/unit/tts-segment-audio-urls.vitest.spec.ts
similarity index 94%
rename from tests/unit/tts-segment-audio-urls.spec.ts
rename to tests/unit/tts-segment-audio-urls.vitest.spec.ts
index 93b8d92..742d53a 100644
--- a/tests/unit/tts-segment-audio-urls.spec.ts
+++ b/tests/unit/tts-segment-audio-urls.vitest.spec.ts
@@ -1,10 +1,10 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   buildSegmentAudioFallbackUrl,
   resolveSegmentAudioUrls,
 } from '../../src/lib/server/tts/segment-audio-urls';
 
-test.describe('tts segment audio url resolution', () => {
+describe('tts segment audio url resolution', () => {
   test('builds fallback URL with encoded params', () => {
     const url = buildSegmentAudioFallbackUrl('doc 1', 'segment/2');
     expect(url).toBe('/api/tts/segments/audio/fallback?documentId=doc%201&segmentId=segment%2F2');
diff --git a/tests/unit/tts-segment-plan-leading.spec.ts b/tests/unit/tts-segment-plan-leading.vitest.spec.ts
similarity index 98%
rename from tests/unit/tts-segment-plan-leading.spec.ts
rename to tests/unit/tts-segment-plan-leading.vitest.spec.ts
index 689d36a..3114733 100644
--- a/tests/unit/tts-segment-plan-leading.spec.ts
+++ b/tests/unit/tts-segment-plan-leading.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { planCanonicalTtsSegments } from '../../src/lib/shared/tts-segment-plan';
 
-test.describe('planCanonicalTtsSegments – leading context handling', () => {
+describe('planCanonicalTtsSegments – leading context handling', () => {
   test('clean boundary: splits block so current source keeps its first sentence', () => {
     const currentSourceKey = 'str:epubcfi(/6/10!/4/2)';
     const plan = planCanonicalTtsSegments([
diff --git a/tests/unit/tts-segment-plan.spec.ts b/tests/unit/tts-segment-plan.vitest.spec.ts
similarity index 98%
rename from tests/unit/tts-segment-plan.spec.ts
rename to tests/unit/tts-segment-plan.vitest.spec.ts
index 8f03797..c9a3740 100644
--- a/tests/unit/tts-segment-plan.spec.ts
+++ b/tests/unit/tts-segment-plan.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { buildSegmentKey, buildSegmentKeyPrefix, planCanonicalTtsSegments } from '../../src/lib/shared/tts-segment-plan';
 
-test.describe('planCanonicalTtsSegments', () => {
+describe('planCanonicalTtsSegments', () => {
   test('emits a cross-boundary segment once and assigns it to the source where it starts', () => {
     const plan = planCanonicalTtsSegments([
       {
@@ -223,7 +223,7 @@ test.describe('planCanonicalTtsSegments', () => {
   });
 });
 
-test.describe('buildSegmentKeyPrefix / buildSegmentKey contract', () => {
+describe('buildSegmentKeyPrefix / buildSegmentKey contract', () => {
   // These keys are the bridge between persistence and the sidebar's merge of
   // synth rows with manifest rows. Both sides must produce identical keys for
   // the same `(documentId, readerType, text)` triple, or the sidebar will
diff --git a/tests/unit/tts-segment-retry-policy.spec.ts b/tests/unit/tts-segment-retry-policy.vitest.spec.ts
similarity index 93%
rename from tests/unit/tts-segment-retry-policy.spec.ts
rename to tests/unit/tts-segment-retry-policy.vitest.spec.ts
index 0dd6e29..140e518 100644
--- a/tests/unit/tts-segment-retry-policy.spec.ts
+++ b/tests/unit/tts-segment-retry-policy.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import {
   isRetryableSegmentStatus,
@@ -6,7 +6,7 @@ import {
   shouldDeferSegmentRetry,
 } from '../../src/lib/client/tts/segment-retry-policy';
 
-test.describe('tts segment retry policy', () => {
+describe('tts segment retry policy', () => {
   test('marks pending/error statuses as retryable', () => {
     expect(isRetryableSegmentStatus('pending')).toBe(true);
     expect(isRetryableSegmentStatus('error')).toBe(true);
diff --git a/tests/unit/tts-segments-audio-cache.spec.ts b/tests/unit/tts-segments-audio-cache.vitest.spec.ts
similarity index 91%
rename from tests/unit/tts-segments-audio-cache.spec.ts
rename to tests/unit/tts-segments-audio-cache.vitest.spec.ts
index ce09173..a1dd8d9 100644
--- a/tests/unit/tts-segments-audio-cache.spec.ts
+++ b/tests/unit/tts-segments-audio-cache.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   buildSegmentAudioCacheHeaders,
   normalizeAudioByteRangeHeader,
@@ -6,7 +6,7 @@ import {
   TTS_SEGMENT_FALLBACK_CACHE_CONTROL,
 } from '../../src/lib/server/tts/segments-audio';
 
-test.describe('tts segment audio cache headers', () => {
+describe('tts segment audio cache headers', () => {
   test('builds fallback cache headers', () => {
     expect(buildSegmentAudioCacheHeaders()).toEqual({
       'Cache-Control': TTS_SEGMENT_FALLBACK_CACHE_CONTROL,
diff --git a/tests/unit/tts-segments-manifest.spec.ts b/tests/unit/tts-segments-manifest.vitest.spec.ts
similarity index 94%
rename from tests/unit/tts-segments-manifest.spec.ts
rename to tests/unit/tts-segments-manifest.vitest.spec.ts
index 513ca5c..ad02218 100644
--- a/tests/unit/tts-segments-manifest.spec.ts
+++ b/tests/unit/tts-segments-manifest.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   compareManifestSegments,
   decodeManifestCursor,
@@ -6,8 +6,9 @@ import {
   encodeManifestCursor,
   parseManifestPageSize,
 } from '../../src/lib/server/tts/segments-manifest';
+import { locatorGroupKey, locatorIdentityKey } from '../../src/lib/shared/tts-locator';
 
-test.describe('tts segments manifest helpers', () => {
+describe('tts segments manifest helpers', () => {
   test('dedupe prefers completed variant over newer pending for same settings key', () => {
     const variants = dedupeManifestVariants([
       {
@@ -125,8 +126,6 @@ test.describe('tts segments manifest helpers', () => {
     const sorted = rows.sort(compareManifestSegments);
     // Recompute groupKey using the production helper to assert the actual
     // grouping behavior rather than the test's hand-labeled groupKey.
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
-    const { locatorGroupKey } = require('../../src/lib/shared/tts-locator');
     const groupKeys = sorted.map((row) => locatorGroupKey(row.locator));
     expect(groupKeys[0]).toBe(groupKeys[1]); // both ch02
     expect(groupKeys[2]).not.toBe(groupKeys[0]); // ch03 is its own group
@@ -141,9 +140,6 @@ test.describe('tts segments manifest helpers', () => {
     // rows visually "disappear" when later pages were generated.
     //
     // The fix uses `locatorIdentityKey` which includes charOffset for EPUB.
-    // eslint-disable-next-line @typescript-eslint/no-require-imports
-    const { locatorIdentityKey, locatorGroupKey } = require('../../src/lib/shared/tts-locator');
-
     const page1Row0 = { readerType: 'epub' as const, spineHref: 'OEBPS/ch02.xhtml', spineIndex: 2, charOffset: 0 };
     const page2Row0 = { readerType: 'epub' as const, spineHref: 'OEBPS/ch02.xhtml', spineIndex: 2, charOffset: 2048 };
 
diff --git a/tests/unit/tts-segments.spec.ts b/tests/unit/tts-segments.vitest.spec.ts
similarity index 98%
rename from tests/unit/tts-segments.spec.ts
rename to tests/unit/tts-segments.vitest.spec.ts
index ddd2125..def8e9f 100644
--- a/tests/unit/tts-segments.spec.ts
+++ b/tests/unit/tts-segments.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   buildProportionalAlignment,
   buildTtsSegmentEntryId,
@@ -11,7 +11,7 @@ import {
   projectSegmentLocator,
 } from '../../src/lib/server/tts/segments';
 
-test.describe('tts segment helpers', () => {
+describe('tts segment helpers', () => {
   test('builds stable settings hash', () => {
     const a = buildTtsSegmentSettingsHash({
       providerRef: 'openai',
diff --git a/tests/unit/tts-settings-admin-view-model.spec.ts b/tests/unit/tts-settings-admin-view-model.vitest.spec.ts
similarity index 97%
rename from tests/unit/tts-settings-admin-view-model.spec.ts
rename to tests/unit/tts-settings-admin-view-model.vitest.spec.ts
index c207ce6..8b1f32f 100644
--- a/tests/unit/tts-settings-admin-view-model.spec.ts
+++ b/tests/unit/tts-settings-admin-view-model.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { resolveTtsSettingsViewModel } from '../../src/lib/client/settings/tts-settings';
 import type { SharedProviderEntry } from '../../src/hooks/useSharedProviders';
@@ -20,7 +20,7 @@ const SHARED: SharedProviderEntry[] = [
   },
 ];
 
-test.describe('resolveTtsSettingsViewModel (admin/shared modes)', () => {
+describe('resolveTtsSettingsViewModel (admin/shared modes)', () => {
   test('keeps default-openai selection when that shared provider exists', () => {
     const vm = resolveTtsSettingsViewModel({
       providerRef: 'default-openai',
diff --git a/tests/unit/walker-theme.spec.ts b/tests/unit/walker-theme.vitest.spec.ts
similarity index 93%
rename from tests/unit/walker-theme.spec.ts
rename to tests/unit/walker-theme.vitest.spec.ts
index c5f5000..777b963 100644
--- a/tests/unit/walker-theme.spec.ts
+++ b/tests/unit/walker-theme.vitest.spec.ts
@@ -1,8 +1,8 @@
-import { expect, test } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 
 import { buildWalkerThemeRules } from '../../src/lib/client/epub/walker-theme';
 
-test.describe('walker theme rules', () => {
+describe('walker theme rules', () => {
   test('always includes foreground/background colors', () => {
     const rules = buildWalkerThemeRules({
       foreground: 'rgb(1, 2, 3)',
diff --git a/tests/unit/whisper-alignment-mapping.spec.ts b/tests/unit/whisper-alignment-mapping.vitest.spec.ts
similarity index 88%
rename from tests/unit/whisper-alignment-mapping.spec.ts
rename to tests/unit/whisper-alignment-mapping.vitest.spec.ts
index 5f91973..b53a4f6 100644
--- a/tests/unit/whisper-alignment-mapping.spec.ts
+++ b/tests/unit/whisper-alignment-mapping.vitest.spec.ts
@@ -1,9 +1,9 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import {
   mapWordsToSentenceOffsets,
 } from '@openreader/compute-core';
 
-test.describe('whisper alignment mapping', () => {
+describe('whisper alignment mapping', () => {
   test('maps words to sentence offsets with punctuation and repeated spaces', () => {
     const aligned = mapWordsToSentenceOffsets('Hello, world  again.', [
       { word: 'Hello', start: 0, end: 0.25 },
diff --git a/tests/unit/whisper-spectral.spec.ts b/tests/unit/whisper-spectral.vitest.spec.ts
similarity index 91%
rename from tests/unit/whisper-spectral.spec.ts
rename to tests/unit/whisper-spectral.vitest.spec.ts
index 90857a2..2b87a04 100644
--- a/tests/unit/whisper-spectral.spec.ts
+++ b/tests/unit/whisper-spectral.vitest.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import { buildGoertzelCoefficients, goertzelPower } from '@openreader/compute-core';
 
 function dftPower(samples: Float32Array, k: number): number {
@@ -13,7 +13,7 @@ function dftPower(samples: Float32Array, k: number): number {
   return (re * re) + (im * im);
 }
 
-test.describe('whisper spectral helpers', () => {
+describe('whisper spectral helpers', () => {
   test('goertzel power matches direct DFT for non-power-of-two frame size', () => {
     const frameSize = 400;
     const bins = 201;
diff --git a/tests/unit/whisper-token-timestamps.spec.ts b/tests/unit/whisper-token-timestamps.vitest.spec.ts
similarity index 95%
rename from tests/unit/whisper-token-timestamps.spec.ts
rename to tests/unit/whisper-token-timestamps.vitest.spec.ts
index a584d6f..c2aded0 100644
--- a/tests/unit/whisper-token-timestamps.spec.ts
+++ b/tests/unit/whisper-token-timestamps.vitest.spec.ts
@@ -1,11 +1,11 @@
-import { test, expect } from '@playwright/test';
+import { describe, expect, test } from 'vitest';
 import * as ort from 'onnxruntime-node';
 import {
   buildWordsFromTimestampedTokens,
   extractTokenStartTimestamps,
 } from '@openreader/compute-core';
 
-test.describe('whisper token timestamp alignment', () => {
+describe('whisper token timestamp alignment', () => {
   test('extracts monotonic token timestamps from cross-attention maps', () => {
     const seqLen = 6;
     const frames = 10;