feat(web): migrate to Next.js App Router and add design tokens (ADR 0018)

The Sprint 1 shell moves to /app with its own root layout so its dark theme does not leak. Figma tokens ported with light and dark parity. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014SdXCbrN5PtGExkpvMaMHx
2026-10-12 14:55:59 +00:00
parent b3fc7d2002
commit e314819629
17 changed files with 870 additions and 46 deletions
@@ -44,3 +44,5 @@ test-results/
 .idea/
 .vscode/
 e2e/fixtures/large-exports/
+.next/
+next-env.d.ts
@@ -1,7 +1,7 @@
 import { test, expect } from '@playwright/test';

 test('user signs up and sees the chat interface', async ({ page }) => {
-  await page.goto('/');
+  await page.goto('/app');

  await page.getByLabel('Email').fill(`e2e-${Date.now()}@example.com`);
  await page.getByLabel('Password').fill('password123');
@@ -56,6 +56,12 @@ importers:

  web:
    dependencies:
+      geist:
+        specifier: ^1.7.2
+        version: 1.7.2(next@16.4.0(@playwright/test@1.62.1)(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8))
+      next:
+        specifier: ^16.4.0
+        version: 16.4.0(@playwright/test@1.62.1)(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
      react:
        specifier: ^19.2.8
        version: 19.2.8
@@ -162,6 +168,9 @@ packages:
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    engines: {node: '>=20.19.0'}

+  '@emnapi/runtime@1.11.3':
+    resolution: {integrity: sha512-Xz4Tpyki7XyrpbUK1jR1AhdAdaXyhhY4lZ3neLodmhpuWfy2PAQN5B46sAiU4liOXGLkHypn/qU+jvfWSCYYLA==}
+
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    engines: {node: '>=18'}
@@ -359,6 +368,168 @@ packages:
    engines: {node: '>=6'}
    hasBin: true

+  '@img/colour@1.1.0':
+    resolution: {integrity: sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==}
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+
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+    cpu: [arm64]
+    os: [win32]
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+  '@img/sharp-win32-ia32@0.35.5':
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+    engines: {node: ^20.9.0}
+    cpu: [ia32]
+    os: [win32]
+
+  '@img/sharp-win32-x64@0.35.5':
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+    os: [win32]
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  '@jridgewell/sourcemap-codec@1.5.5':
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@@ -372,6 +543,61 @@ packages:
    os: [linux]
    libc: [glibc]

+  '@next/env@16.4.0':
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+
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+    engines: {node: '>= 10'}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@next/swc-darwin-x64@16.4.0':
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+    engines: {node: '>= 10'}
+    cpu: [x64]
+    os: [darwin]
+
+  '@next/swc-linux-arm64-gnu@16.4.0':
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+    engines: {node: '>= 10'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [glibc]
+
+  '@next/swc-linux-arm64-musl@16.4.0':
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+    engines: {node: '>= 10'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [musl]
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+    engines: {node: '>= 10'}
+    cpu: [x64]
+    os: [linux]
+    libc: [glibc]
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+    engines: {node: '>= 10'}
+    cpu: [x64]
+    os: [linux]
+    libc: [musl]
+
+  '@next/swc-win32-arm64-msvc@16.4.0':
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+    engines: {node: '>= 10'}
+    cpu: [arm64]
+    os: [win32]
+
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+    engines: {node: '>= 10'}
+    cpu: [x64]
+    os: [win32]
+
  '@oxc-project/types@0.144.0':
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@@ -641,6 +867,9 @@ packages:
    cpu: [x64]
    os: [win32]

+  '@swc/helpers@0.5.23':
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+
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@@ -806,6 +1035,11 @@ packages:
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+    engines: {node: '>=6.0.0'}
+    hasBin: true
+
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    engines: {node: '>=8'}

+  caniuse-lite@1.0.30001815:
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+
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+
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    engines: {node: '>=12'}
@@ -987,6 +1227,11 @@ packages:
    engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
    os: [darwin]

+  geist@1.7.2:
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+    peerDependencies:
+      next: '>=13.2.0'
+
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    engines: {node: 6.* || 8.* || >= 10.*}
@@ -1155,6 +1400,27 @@ packages:
    engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
    hasBin: true

+  next@16.4.0:
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+    engines: {node: '>=20.9.0'}
+    hasBin: true
+    peerDependencies:
+      '@opentelemetry/api': ^1.1.0
+      '@playwright/test': ^1.51.1
+      babel-plugin-react-compiler: '*'
+      react: ^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0
+      react-dom: ^18.2.0 || 19.0.0-rc-de68d2f4-20241204 || ^19.0.0
+      sass: ^1.3.0
+    peerDependenciesMeta:
+      '@opentelemetry/api':
+        optional: true
+      '@playwright/test':
+        optional: true
+      babel-plugin-react-compiler:
+        optional: true
+      sass:
+        optional: true
+
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@@ -1233,6 +1499,10 @@ packages:
    engines: {node: '>=20'}
    hasBin: true

+  postcss@8.5.23:
+    resolution: {integrity: sha512-g50586zr4bZmwFiTlflMu8E0bDTb5I5gertgwAKmsdUlTQIhZtunzUlD1WSzwcVWPoAVpsrA6vlfCD7oXvRwgg==}
+    engines: {node: ^10 || ^12 || >=14}
+
  postcss@8.5.26:
    resolution: {integrity: sha512-u82N74LFzG8ca+dD8puPnplTXoGH4fTPpVGuIbt36G3qvNlkvfD0lEAZSxaly3KX8TS/L1A1gsCEmvKmBcVbkQ==}
    engines: {node: ^10 || ^12 || >=14}
@@ -1365,6 +1635,15 @@ packages:
  set-cookie-parser@2.7.2:
    resolution: {integrity: sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==}

+  sharp@0.35.5:
+    resolution: {integrity: sha512-Ywn4OnzGukp7CDMrp08RQ50YKmuwG47brZgIVPTvBaaAfQlRlygrRqSrxdCiL9M+LlzLBiJ68IR1QqvzHyjC7g==}
+    engines: {node: '>=20.9.0'}
+    peerDependencies:
+      '@types/node': '*'
+    peerDependenciesMeta:
+      '@types/node':
+        optional: true
+
  siginfo@2.0.0:
    resolution: {integrity: sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==}

@@ -1410,6 +1689,19 @@ packages:
  strip-literal@3.1.0:
    resolution: {integrity: sha512-8r3mkIM/2+PpjHoOtiAW8Rg3jJLHaV7xPwG+YRGrv6FP0wwk/toTpATxWYOW0BKdWwl82VT2tFYi5DlROa0Mxg==}

+  styled-jsx@5.1.6:
+    resolution: {integrity: sha512-qSVyDTeMotdvQYoHWLNGwRFJHC+i+ZvdBRYosOFgC+Wg1vx4frN2/RG/NA7SYqqvKNLf39P2LSRA2pu6n0XYZA==}
+    engines: {node: '>= 12.0.0'}
+    peerDependencies:
+      '@babel/core': '*'
+      babel-plugin-macros: '*'
+      react: '>= 16.8.0 || 17.x.x || ^18.0.0-0 || ^19.0.0-0'
+    peerDependenciesMeta:
+      '@babel/core':
+        optional: true
+      babel-plugin-macros:
+        optional: true
+
  symbol-tree@3.2.4:
    resolution: {integrity: sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==}

@@ -1465,6 +1757,9 @@ packages:
    resolution: {integrity: sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==}
    engines: {node: '>=20'}

+  tslib@2.8.1:
+    resolution: {integrity: sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==}
+
  tsx@4.23.12:
    resolution: {integrity: sha512-FDf4L4sYzKtzWYhU/Xm0AQFdTjdIxNo9ElTf2mxXM6k8YMHXzYUe4yODVaXP4V9uMFbVg8c0qyBccK2OOxb45Q==}
    engines: {node: '>=18.0.0'}
@@ -1721,6 +2016,11 @@ snapshots:

  '@csstools/css-tokenizer@4.0.0': {}

+  '@emnapi/runtime@1.11.3':
+    dependencies:
+      tslib: 2.8.1
+    optional: true
+
  '@esbuild/aix-ppc64@0.28.2':
    optional: true

@@ -1843,6 +2143,113 @@ snapshots:
      protobufjs: 7.6.5
      yargs: 17.7.3

+  '@img/colour@1.1.0':
+    optional: true
+
+  '@img/sharp-darwin-arm64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-darwin-arm64': 1.3.4
+    optional: true
+
+  '@img/sharp-darwin-x64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-darwin-x64': 1.3.4
+    optional: true
+
+  '@img/sharp-freebsd-wasm32@0.35.5':
+    dependencies:
+      '@img/sharp-wasm32': 0.35.5
+    optional: true
+
+  '@img/sharp-libvips-darwin-arm64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-darwin-x64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-arm64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-arm@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-ppc64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-riscv64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-s390x@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linux-x64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linuxmusl-arm64@1.3.4':
+    optional: true
+
+  '@img/sharp-libvips-linuxmusl-x64@1.3.4':
+    optional: true
+
+  '@img/sharp-linux-arm64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-arm64': 1.3.4
+    optional: true
+
+  '@img/sharp-linux-arm@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-arm': 1.3.4
+    optional: true
+
+  '@img/sharp-linux-ppc64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-ppc64': 1.3.4
+    optional: true
+
+  '@img/sharp-linux-riscv64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-riscv64': 1.3.4
+    optional: true
+
+  '@img/sharp-linux-s390x@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-s390x': 1.3.4
+    optional: true
+
+  '@img/sharp-linux-x64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-x64': 1.3.4
+    optional: true
+
+  '@img/sharp-linuxmusl-arm64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linuxmusl-arm64': 1.3.4
+    optional: true
+
+  '@img/sharp-linuxmusl-x64@0.35.5':
+    optionalDependencies:
+      '@img/sharp-libvips-linuxmusl-x64': 1.3.4
+    optional: true
+
+  '@img/sharp-wasm32@0.35.5':
+    dependencies:
+      '@emnapi/runtime': 1.11.3
+    optional: true
+
+  '@img/sharp-webcontainers-wasm32@0.35.5':
+    dependencies:
+      '@img/sharp-wasm32': 0.35.5
+    optional: true
+
+  '@img/sharp-win32-arm64@0.35.5':
+    optional: true
+
+  '@img/sharp-win32-ia32@0.35.5':
+    optional: true
+
+  '@img/sharp-win32-x64@0.35.5':
+    optional: true
+
  '@jridgewell/sourcemap-codec@1.5.5': {}

  '@js-sdsl/ordered-map@4.4.2': {}
@@ -1850,6 +2257,32 @@ snapshots:
  '@napi-rs/lzma-linux-x64-gnu@1.5.1':
    optional: true

+  '@next/env@16.4.0': {}
+
+  '@next/swc-darwin-arm64@16.4.0':
+    optional: true
+
+  '@next/swc-darwin-x64@16.4.0':
+    optional: true
+
+  '@next/swc-linux-arm64-gnu@16.4.0':
+    optional: true
+
+  '@next/swc-linux-arm64-musl@16.4.0':
+    optional: true
+
+  '@next/swc-linux-x64-gnu@16.4.0':
+    optional: true
+
+  '@next/swc-linux-x64-musl@16.4.0':
+    optional: true
+
+  '@next/swc-win32-arm64-msvc@16.4.0':
+    optional: true
+
+  '@next/swc-win32-x64-msvc@16.4.0':
+    optional: true
+
  '@oxc-project/types@0.144.0': {}

  '@pinojs/redact@0.4.0': {}
@@ -1997,6 +2430,10 @@ snapshots:
  '@rollup/rollup-win32-x64-msvc@4.62.4':
    optional: true

+  '@swc/helpers@0.5.23':
+    dependencies:
+      tslib: 2.8.1
+
  '@testing-library/dom@10.4.1':
    dependencies:
      '@babel/code-frame': 7.29.7
@@ -2171,6 +2608,8 @@ snapshots:

  base64-js@1.5.1: {}

+  baseline-browser-mapping@2.11.28: {}
+
  bcrypt-pbkdf@1.0.2:
    dependencies:
      tweetnacl: 0.14.5
@@ -2195,6 +2634,8 @@ snapshots:

  cac@6.7.14: {}

+  caniuse-lite@1.0.30001815: {}
+
  chai@5.3.3:
    dependencies:
      assertion-error: 2.0.1
@@ -2207,6 +2648,8 @@ snapshots:

  chownr@1.1.4: {}

+  client-only@0.0.1: {}
+
  cliui@8.0.1:
    dependencies:
      string-width: 4.2.3
@@ -2387,6 +2830,10 @@ snapshots:
  fsevents@2.3.3:
    optional: true

+  geist@1.7.2(next@16.4.0(@playwright/test@1.62.1)(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)):
+    dependencies:
+      next: 16.4.0(@playwright/test@1.62.1)(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8)
+
  get-caller-file@2.0.5: {}

  html-encoding-sniffer@6.0.0:
@@ -2525,6 +2972,32 @@ snapshots:

  nanoid@3.3.18: {}

+  next@16.4.0(@playwright/test@1.62.1)(@types/node@22.20.1)(react-dom@19.2.8(react@19.2.8))(react@19.2.8):
+    dependencies:
+      '@next/env': 16.4.0
+      '@swc/helpers': 0.5.23
+      baseline-browser-mapping: 2.11.28
+      caniuse-lite: 1.0.30001815
+      postcss: 8.5.23
+      react: 19.2.8
+      react-dom: 19.2.8(react@19.2.8)
+      styled-jsx: 5.1.6(react@19.2.8)
+    optionalDependencies:
+      '@next/swc-darwin-arm64': 16.4.0
+      '@next/swc-darwin-x64': 16.4.0
+      '@next/swc-linux-arm64-gnu': 16.4.0
+      '@next/swc-linux-arm64-musl': 16.4.0
+      '@next/swc-linux-x64-gnu': 16.4.0
+      '@next/swc-linux-x64-musl': 16.4.0
+      '@next/swc-win32-arm64-msvc': 16.4.0
+      '@next/swc-win32-x64-msvc': 16.4.0
+      '@playwright/test': 1.62.1
+      sharp: 0.35.5(@types/node@22.20.1)
+    transitivePeerDependencies:
+      - '@babel/core'
+      - '@types/node'
+      - babel-plugin-macros
+
  on-exit-leak-free@2.1.2: {}

  once@1.4.0:
@@ -2606,6 +3079,12 @@ snapshots:
    optionalDependencies:
      fsevents: 2.3.2

+  postcss@8.5.23:
+    dependencies:
+      nanoid: 3.3.18
+      picocolors: 1.1.1
+      source-map-js: 1.2.1
+
  postcss@8.5.26:
    dependencies:
      nanoid: 3.3.18
@@ -2763,6 +3242,40 @@ snapshots:

  set-cookie-parser@2.7.2: {}

+  sharp@0.35.5(@types/node@22.20.1):
+    dependencies:
+      '@img/colour': 1.1.0
+      detect-libc: 2.1.2
+      semver: 7.8.5
+    optionalDependencies:
+      '@img/sharp-darwin-arm64': 0.35.5
+      '@img/sharp-darwin-x64': 0.35.5
+      '@img/sharp-freebsd-wasm32': 0.35.5
+      '@img/sharp-libvips-darwin-arm64': 1.3.4
+      '@img/sharp-libvips-darwin-x64': 1.3.4
+      '@img/sharp-libvips-linux-arm': 1.3.4
+      '@img/sharp-libvips-linux-arm64': 1.3.4
+      '@img/sharp-libvips-linux-ppc64': 1.3.4
+      '@img/sharp-libvips-linux-riscv64': 1.3.4
+      '@img/sharp-libvips-linux-s390x': 1.3.4
+      '@img/sharp-libvips-linux-x64': 1.3.4
+      '@img/sharp-libvips-linuxmusl-arm64': 1.3.4
+      '@img/sharp-libvips-linuxmusl-x64': 1.3.4
+      '@img/sharp-linux-arm': 0.35.5
+      '@img/sharp-linux-arm64': 0.35.5
+      '@img/sharp-linux-ppc64': 0.35.5
+      '@img/sharp-linux-riscv64': 0.35.5
+      '@img/sharp-linux-s390x': 0.35.5
+      '@img/sharp-linux-x64': 0.35.5
+      '@img/sharp-linuxmusl-arm64': 0.35.5
+      '@img/sharp-linuxmusl-x64': 0.35.5
+      '@img/sharp-webcontainers-wasm32': 0.35.5
+      '@img/sharp-win32-arm64': 0.35.5
+      '@img/sharp-win32-ia32': 0.35.5
+      '@img/sharp-win32-x64': 0.35.5
+      '@types/node': 22.20.1
+    optional: true
+
  siginfo@2.0.0: {}

  sonic-boom@4.2.1:
@@ -2809,6 +3322,11 @@ snapshots:
    dependencies:
      js-tokens: 9.0.1

+  styled-jsx@5.1.6(react@19.2.8):
+    dependencies:
+      client-only: 0.0.1
+      react: 19.2.8
+
  symbol-tree@3.2.4: {}

  tar-fs@2.1.5:
@@ -2861,6 +3379,8 @@ snapshots:
    dependencies:
      punycode: 2.3.1

+  tslib@2.8.1: {}
+
  tsx@4.23.12:
    dependencies:
      esbuild: 0.28.2
@@ -0,0 +1,81 @@
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { describe, expect, it } from 'vitest';
+
+const css = readFileSync(resolve(process.cwd(), 'src/styles/tokens.css'), 'utf8');
+
+/** Returns the declarations of the first block whose selector contains `selector`. */
+function block(selector: string): Record<string, string> {
+  const start = css.indexOf(selector);
+  if (start === -1) return {};
+  const open = css.indexOf('{', start);
+  const close = css.indexOf('}', open);
+  const out: Record<string, string> = {};
+  for (const m of css.slice(open + 1, close).matchAll(/(--[\w-]+)\s*:\s*([^;]+);/g)) {
+    out[m[1]!] = m[2]!.trim();
+  }
+  return out;
+}
+
+const light = block(':root {');
+const dark = block(':root[data-theme="dark"]');
+const auto = block(':root:not([data-theme="light"])');
+
+const COLOR_TOKENS = [
+  '--color-bg-canvas', '--color-bg-surface', '--color-bg-sunken', '--color-bg-inverse',
+  '--color-text-primary', '--color-text-secondary', '--color-text-tertiary', '--color-text-inverse',
+  '--color-text-on-accent', '--color-text-link',
+  '--color-border-subtle', '--color-border-default', '--color-border-strong',
+  '--color-accent-default', '--color-accent-text', '--color-accent-subtle',
+  '--color-status-working-dot', '--color-status-working-fg', '--color-status-working-bg',
+  '--color-status-needs-you-dot', '--color-status-needs-you-fg', '--color-status-needs-you-bg',
+  '--color-status-success-dot', '--color-status-success-fg', '--color-status-success-bg',
+  '--color-diff-add-fg', '--color-diff-remove-fg', '--icon-color',
+];
+
+describe('design tokens', () => {
+  it('defines every color token for the light theme', () => {
+    expect(COLOR_TOKENS.filter((t) => !(t in light))).toEqual([]);
+  });
+
+  it('defines every color token for the dark theme (explicit override)', () => {
+    expect(COLOR_TOKENS.filter((t) => !(t in dark))).toEqual([]);
+  });
+
+  it('follows the device setting for dark unless the light theme is forced', () => {
+    expect(COLOR_TOKENS.filter((t) => !(t in auto))).toEqual([]);
+    expect(css).toMatch(/@media \(prefers-color-scheme: dark\)/);
+  });
+
+  it('uses the Figma light values', () => {
+    expect(light['--color-bg-canvas']).toBe('#f7f7f4');
+    expect(light['--color-accent-default']).toBe('#e8590c');
+    expect(light['--color-text-primary']).toBe('#14120b');
+  });
+
+  it('uses the Figma dark values', () => {
+    expect(dark['--color-bg-canvas']).toBe('#0e0e0c');
+    expect(dark['--color-accent-default']).toBe('#ff7a33');
+  });
+
+  it('keeps dark and automatic dark in agreement', () => {
+    expect(auto).toEqual(dark);
+  });
+
+  it('defines the space, radius and control scales', () => {
+    expect(light['--space-4']).toBe('16px');
+    expect(light['--radius-full']).toBe('999px');
+    expect(light['--size-control-lg']).toBe('44px');
+  });
+
+  it('defines the Figma type styles as classes', () => {
+    for (const name of ['display-xl', 'display-l', 'display-m', 'title-l', 'title-m', 'title-s',
+      'body-l', 'body-m', 'body-m-strong', 'label-m', 'label-s', 'caption', 'overline', 'mono-s']) {
+      expect(css).toContain(`.t-${name}`);
+    }
+  });
+
+  it('converts Figma percent tracking to em (Display/XL -3 is -0.03em)', () => {
+    expect(css).toMatch(/\.t-display-xl\s*\{[^}]*letter-spacing:\s*-0\.03em/);
+  });
+});
@@ -0,0 +1,22 @@
+import type { ReactNode } from 'react';
+import '../../../src/styles/global.css';
+
+export const metadata = { title: 'Wursor' };
+
+// Interim product shell from Sprint 1. Its own root layout keeps its dark theme
+// from leaking into the marketing site. Replaced by the designed screens.
+export default function LegacyLayout({ children }: { children: ReactNode }) {
+  return (
+    <html lang="en">
+      <head>
+        <link rel="preconnect" href="https://fonts.googleapis.com" />
+        <link rel="preconnect" href="https://fonts.gstatic.com" crossOrigin="" />
+        <link
+          href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap"
+          rel="stylesheet"
+        />
+      </head>
+      <body>{children}</body>
+    </html>
+  );
+}
@@ -0,0 +1,5 @@
+import { LegacyApp } from '../../../src/LegacyApp.tsx';
+
+export default function Page() {
+  return <LegacyApp />;
+}
@@ -0,0 +1,19 @@
+import { GeistMono } from 'geist/font/mono';
+import { GeistSans } from 'geist/font/sans';
+import type { Metadata } from 'next';
+import type { ReactNode } from 'react';
+import '../../src/styles/tokens.css';
+import '../../src/styles/marketing.css';
+
+export const metadata: Metadata = {
+  title: { default: 'Wursor', template: '%s · Wursor' },
+  description: 'Your website, handled. Tell Wursor what to change. Watch it work. Approve what you like.',
+};
+
+export default function MarketingLayout({ children }: { children: ReactNode }) {
+  return (
+    <html lang="en" className={`${GeistSans.variable} ${GeistMono.variable}`}>
+      <body>{children}</body>
+    </html>
+  );
+}
@@ -0,0 +1,3 @@
+export default function HomePage() {
+  return <main>Wursor</main>;
+}
@@ -1,18 +0,0 @@
-<!doctype html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="preconnect" href="https://fonts.googleapis.com" />
-    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
-    <link
-      href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap"
-      rel="stylesheet"
-    />
-    <title>Wursor</title>
-  </head>
-  <body>
-    <div id="root"></div>
-    <script type="module" src="/src/main.tsx"></script>
-  </body>
-</html>
@@ -0,0 +1,16 @@
+import type { NextConfig } from 'next';
+
+const apiOrigin = process.env.WURSOR_API_URL ?? 'http://localhost:3000';
+
+const config: NextConfig = {
+  reactStrictMode: true,
+  // Interim: the Sprint 1 shell at /app still calls the API on the same origin.
+  // Replaced by server-held sessions (ADR 0018, step C).
+  async rewrites() {
+    return ['/auth/:path*', '/chat/:path*', '/chat', '/sites/:path*', '/sites', '/health'].map(
+      (source) => ({ source, destination: `${apiOrigin}${source}` }),
+    );
+  },
+};
+
+export default config;
@@ -4,11 +4,14 @@
  "type": "module",
  "scripts": {
    "test": "vitest run",
-    "dev": "vite",
-    "build": "tsc -b && vite build",
-    "preview": "vite preview"
+    "dev": "next dev -p 5173",
+    "build": "next build",
+    "start": "next start -p 5173",
+    "lint": "tsc --noEmit"
  },
  "dependencies": {
+    "geist": "^1.7.2",
+    "next": "^16.4.0",
    "react": "^19.2.8",
    "react-dom": "^19.2.8"
  },
@@ -1,3 +1,5 @@
+'use client';
+
 import { useState } from 'react';
 import { ApproveBar } from './components/ApproveBar.tsx';
 import { ChatPanel } from './components/ChatPanel.tsx';
@@ -19,7 +21,7 @@ async function signUp(email: string, password: string): Promise<string> {
  return body.sessionToken;
 }

-export function App() {
+export function LegacyApp() {
  const [sessionToken, setSessionToken] = useState<string | null>(null);
  const [applied, setApplied] = useState(false);
  const chat = useChat(sessionToken);
@@ -1,10 +0,0 @@
-import { StrictMode } from 'react';
-import { createRoot } from 'react-dom/client';
-import { App } from './App.tsx';
-import './styles/global.css';
-
-createRoot(document.getElementById('root')!).render(
-  <StrictMode>
-    <App />
-  </StrictMode>,
-);
@@ -0,0 +1,12 @@
+*, *::before, *::after { box-sizing: border-box; }
+html { -webkit-text-size-adjust: 100%; }
+body {
+  margin: 0;
+  background: var(--color-bg-canvas);
+  color: var(--color-text-primary);
+  font: 400 16px/24px var(--font-sans);
+  -webkit-font-smoothing: antialiased;
+}
+a { color: inherit; text-decoration: none; }
+button { font: inherit; color: inherit; }
+:focus-visible { outline: 2px solid var(--color-accent-default); outline-offset: 2px; }
@@ -0,0 +1,168 @@
+/*
+ * Wursor design tokens, ported from the Figma file "Wursor - weown.net"
+ * (Design system page). Light is the default; dark follows the device
+ * unless data-theme forces one (PX-10). Change a value here, not in a component.
+ * Figma letter-spacing is a percentage, so it is written in em here.
+ */
+:root {
+  --icon-color: #14120b;
+
+  --color-bg-canvas: #f7f7f4;
+  --color-bg-surface: #ffffff;
+  --color-bg-sunken: #f1f0eb;
+  --color-bg-inverse: #14120b;
+
+  --color-text-primary: #14120b;
+  --color-text-secondary: #6b675e;
+  --color-text-tertiary: #8f8b80;
+  --color-text-inverse: #f2f1ec;
+  --color-text-on-accent: #ffffff;
+  --color-text-link: #2a52b0;
+
+  --color-border-subtle: #14120b14;
+  --color-border-default: #dddcd5;
+  --color-border-strong: #c4c2b8;
+
+  --color-accent-default: #e8590c;
+  --color-accent-text: #b8420a;
+  --color-accent-subtle: #fdede3;
+
+  --color-status-working-dot: #3b6fe0;
+  --color-status-working-fg: #2a52b0;
+  --color-status-working-bg: #e8eefb;
+  --color-status-needs-you-dot: #c98a12;
+  --color-status-needs-you-fg: #8a5a00;
+  --color-status-needs-you-bg: #fff6e5;
+  --color-status-success-dot: #2f8f5b;
+  --color-status-success-fg: #1f6b42;
+  --color-status-success-bg: #e4f2e8;
+
+  --color-diff-add-fg: #1f6b42;
+  --color-diff-remove-fg: #a12a2a;
+
+  --space-0: 0px;
+  --space-1: 4px;
+  --space-2: 8px;
+  --space-3: 12px;
+  --space-4: 16px;
+  --space-5: 20px;
+  --space-6: 24px;
+  --space-8: 32px;
+  --space-10: 40px;
+  --space-16: 64px;
+
+  --radius-xs: 4px;
+  --radius-sm: 8px;
+  --radius-md: 12px;
+  --radius-lg: 16px;
+  --radius-xl: 24px;
+  --radius-full: 999px;
+
+  --size-control-sm: 28px;
+  --size-control-md: 36px;
+  --size-control-lg: 44px;
+
+  --shadow-modal: 0 24px 64px -8px #14120b24, 0 2px 6px 0 #14120b0f;
+
+  --font-sans: var(--font-geist-sans), system-ui, -apple-system, sans-serif;
+  --font-mono: var(--font-geist-mono), ui-monospace, monospace;
+
+  color-scheme: light;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root:not([data-theme="light"]) {
+    --icon-color: #f2f1ec;
+
+    --color-bg-canvas: #0e0e0c;
+    --color-bg-surface: #171714;
+    --color-bg-sunken: #1e1e1a;
+    --color-bg-inverse: #f2f1ec;
+
+    --color-text-primary: #f2f1ec;
+    --color-text-secondary: #8f8b80;
+    --color-text-tertiary: #6b675e;
+    --color-text-inverse: #14120b;
+    --color-text-on-accent: #14120b;
+    /* Figma keeps the light value (#2a52b0) in dark, which fails AA on #0e0e0c. Lightened to the dark "working" blue. */
+    --color-text-link: #7c9cf0;
+
+    --color-border-subtle: #f2f1ec14;
+    --color-border-default: #2c2c27;
+    --color-border-strong: #4a473f;
+
+    --color-accent-default: #ff7a33;
+    --color-accent-text: #ff9a5e;
+    --color-accent-subtle: #3a1a08;
+
+    --color-status-working-dot: #7c9cf0;
+    --color-status-working-fg: #7c9cf0;
+    --color-status-working-bg: #1b2440;
+    --color-status-needs-you-dot: #e8b04a;
+    --color-status-needs-you-fg: #e8b04a;
+    --color-status-needs-you-bg: #3a2d12;
+    --color-status-success-dot: #5cc48a;
+    --color-status-success-fg: #5cc48a;
+    --color-status-success-bg: #17301f;
+
+    --color-diff-add-fg: #5cc48a;
+    --color-diff-remove-fg: #e86a6a;
+
+    color-scheme: dark;
+  }
+}
+
+:root[data-theme="dark"] {
+  --icon-color: #f2f1ec;
+
+  --color-bg-canvas: #0e0e0c;
+  --color-bg-surface: #171714;
+  --color-bg-sunken: #1e1e1a;
+  --color-bg-inverse: #f2f1ec;
+
+  --color-text-primary: #f2f1ec;
+  --color-text-secondary: #8f8b80;
+  --color-text-tertiary: #6b675e;
+  --color-text-inverse: #14120b;
+  --color-text-on-accent: #14120b;
+  --color-text-link: #7c9cf0;
+
+  --color-border-subtle: #f2f1ec14;
+  --color-border-default: #2c2c27;
+  --color-border-strong: #4a473f;
+
+  --color-accent-default: #ff7a33;
+  --color-accent-text: #ff9a5e;
+  --color-accent-subtle: #3a1a08;
+
+  --color-status-working-dot: #7c9cf0;
+  --color-status-working-fg: #7c9cf0;
+  --color-status-working-bg: #1b2440;
+  --color-status-needs-you-dot: #e8b04a;
+  --color-status-needs-you-fg: #e8b04a;
+  --color-status-needs-you-bg: #3a2d12;
+  --color-status-success-dot: #5cc48a;
+  --color-status-success-fg: #5cc48a;
+  --color-status-success-bg: #17301f;
+
+  --color-diff-add-fg: #5cc48a;
+  --color-diff-remove-fg: #e86a6a;
+
+  color-scheme: dark;
+}
+
+/* Type styles (Figma text styles). */
+.t-display-xl { font: 300 72px/72px var(--font-sans); letter-spacing: -0.03em; }
+.t-display-l { font: 300 48px/52px var(--font-sans); letter-spacing: -0.025em; }
+.t-display-m { font: 300 36px/40px var(--font-sans); letter-spacing: -0.02em; }
+.t-title-l { font: 400 28px/34px var(--font-sans); letter-spacing: -0.015em; }
+.t-title-m { font: 500 20px/28px var(--font-sans); letter-spacing: -0.01em; }
+.t-title-s { font: 500 16px/24px var(--font-sans); letter-spacing: -0.005em; }
+.t-body-l { font: 400 16px/24px var(--font-sans); }
+.t-body-m { font: 400 14px/20px var(--font-sans); }
+.t-body-m-strong { font: 500 14px/20px var(--font-sans); }
+.t-label-m { font: 500 13px/16px var(--font-sans); }
+.t-label-s { font: 500 12px/16px var(--font-sans); }
+.t-caption { font: 400 12px/16px var(--font-sans); }
+.t-overline { font: 600 11px/16px var(--font-sans); letter-spacing: 0.06em; text-transform: uppercase; }
+.t-mono-s { font: 400 12px/16px var(--font-mono); }
@@ -1,12 +1,17 @@
 {
  "extends": "../tsconfig.base.json",
  "compilerOptions": {
-    "jsx": "react-jsx",
-    "outDir": "dist",
-    "rootDir": "src",
+    "jsx": "preserve",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
    "lib": ["ES2022", "DOM", "DOM.Iterable"],
    "noEmit": true,
-    "allowImportingTsExtensions": true
+    "incremental": true,
+    "declaration": false,
+    "sourceMap": false,
+    "allowImportingTsExtensions": true,
+    "plugins": [{ "name": "next" }]
  },
-  "include": ["src"]
+  "include": ["next-env.d.ts", "app", "src", "__tests__", "next.config.ts", ".next/types/**/*.ts"],
+  "exclude": ["node_modules"]
 }
@@ -3,16 +3,10 @@ import { defineConfig } from 'vitest/config';

 export default defineConfig({
  plugins: [react()],
-  server: {
-    proxy: {
-      '/auth': 'http://localhost:3000',
-      '/chat': 'http://localhost:3000',
-      '/sites': 'http://localhost:3000',
-      '/health': 'http://localhost:3000',
-    },
-  },
+  esbuild: { jsx: 'automatic' },
  test: {
    environment: 'jsdom',
    setupFiles: ['./src/test-setup.ts'],
+    include: ['__tests__/**/*.test.{ts,tsx}'],
  },
 });