diff --git a/.gitignore b/.gitignore
index 12d431d..921f58a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,5 +9,6 @@
 /.vite/
 /.env
 /.env.*
+/.svelte-check/
 
 .DS_Store
diff --git a/knip.config.ts b/knip.config.ts
index 426a3ac..9dc2237 100644
--- a/knip.config.ts
+++ b/knip.config.ts
@@ -7,6 +7,9 @@ export default {
     // Loaded by Netlify Database integration at runtime even though app code
     // reaches it through drizzle-orm/netlify-db.
     "@netlify/database",
+    // Used only via the `svelte-check --tsgo` flag (the tsgo typechecker), so
+    // knip can't see it referenced in source and reports a false positive.
+    "@typescript/native-preview",
   ],
   ignoreExportsUsedInFile: true,
 } satisfies KnipConfig;
diff --git a/package.json b/package.json
index b4c8db3..8fe1468 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "test:coverage": "vitest run --coverage",
     "test:unit": "vitest run",
     "test:unit:watch": "vitest",
-    "typecheck": "svelte-check --tsconfig ./tsconfig.json"
+    "typecheck": "svelte-check --tsconfig ./tsconfig.json --tsgo"
   },
   "dependencies": {
     "@lucide/svelte": "^1.22.0",
@@ -41,6 +41,7 @@
     "@testing-library/svelte": "^5.4.2",
     "@testing-library/user-event": "^14.6.1",
     "@types/node": "^26.0.1",
+    "@typescript/native-preview": "7.0.0-dev.20260629.1",
     "@vitest/coverage-v8": "4.1.9",
     "drizzle-kit": "1.0.0-rc.4-ca0f029",
     "jsdom": "^29.1.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1488a55..9fbfe6c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -259,6 +259,9 @@ importers:
       '@types/node':
         specifier: ^26.0.1
         version: 26.0.1
+      '@typescript/native-preview':
+        specifier: 7.0.0-dev.20260629.1
+        version: 7.0.0-dev.20260629.1
       '@vitest/coverage-v8':
         specifier: 4.1.9
         version: 4.1.9(vitest@4.1.9)
@@ -1955,6 +1958,53 @@ packages:
     resolution: {integrity: sha512-CY3uyFSRbcQv3nnSv8S0+lDftMVz6P963PoRlxrV7ew/Md564g9ut60PYzdLM5qW4jFn93GBF+Soi90ISAN+GQ==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
 
+  '@typescript/native-preview-darwin-arm64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-wXRExZJweYoTzE4atRR7T5HwKJYkl6/KHxON0eF0iy2fvgLXDlyq4AQqhmV8mMx10PQKc/4sNbfhD4kjWWvm8A==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@typescript/native-preview-darwin-x64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-xkL/tETzUuDxfRkk2rD0/CjjjGLyOLHeE103T52rpgj0VNSXMnn7tTiw+TSdxnS61b8ImOrWgQJujhPFTp0jng==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [darwin]
+
+  '@typescript/native-preview-linux-arm64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-y4ey82krq4iLNHML4G1dUObBWY6gNAjVqaUHFDv7+LBu5bfAJy8VClBaLtAJce3siQQeB0/4SkN4XsAa0oZktQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [linux]
+
+  '@typescript/native-preview-linux-arm@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-QlTxO+O6yELc0NYZZYIbncZhkhw+K/vBoVg+mKipbEIK5b1E6cwW7ivWIrDp1FfssQ0Wu7zxincPappoci7KNw==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm]
+    os: [linux]
+
+  '@typescript/native-preview-linux-x64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-ckb4HyugC5beDpOMPOVpEx1H3l2Z2RgsGPxFOLGMU6LLIHQwlCaSdRjSfH8Hq8yffPgKuotTQLdA89cP1IC8xQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [linux]
+
+  '@typescript/native-preview-win32-arm64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-Ktgepu9p0blqrbiryzYrw11ddnbESXPdeGKURDG/wXESoHQETsMNxKWhqAo587ItNnWjKOBFxoEM22eP9OzKnw==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [win32]
+
+  '@typescript/native-preview-win32-x64@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-b2wmeIpFJs/peej3NG26320ya+iYQz21JzFYDrnvtsEeR/g66rB9uvp4Owo4J1AG/BcmRWC/nuwrBy3Jdb+UDA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [win32]
+
+  '@typescript/native-preview@7.0.0-dev.20260629.1':
+    resolution: {integrity: sha512-KImWFkxGUa/V78bUEAgzeJQT+6wKQXDDYHHrOavof8wnbMCpj86KuPNyBIPQMtoHiz2If8aNTums2m50oE3oqw==}
+    engines: {node: '>=16.20.0'}
+    hasBin: true
+
   '@vercel/nft@0.29.4':
     resolution: {integrity: sha512-6lLqMNX3TuycBPABycx7A9F1bHQR7kiQln6abjFbPrf5C/05qHM9M5E4PeTE59c7z8g6vHnx1Ioihb2AQl7BTA==}
     engines: {node: '>=18'}
@@ -6228,6 +6278,37 @@ snapshots:
       '@typescript-eslint/types': 8.62.0
       eslint-visitor-keys: 5.0.1
 
+  '@typescript/native-preview-darwin-arm64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-darwin-x64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-linux-arm64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-linux-arm@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-linux-x64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-win32-arm64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview-win32-x64@7.0.0-dev.20260629.1':
+    optional: true
+
+  '@typescript/native-preview@7.0.0-dev.20260629.1':
+    optionalDependencies:
+      '@typescript/native-preview-darwin-arm64': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-darwin-x64': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-linux-arm': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-linux-arm64': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-linux-x64': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-win32-arm64': 7.0.0-dev.20260629.1
+      '@typescript/native-preview-win32-x64': 7.0.0-dev.20260629.1
+
   '@vercel/nft@0.29.4':
     dependencies:
       '@mapbox/node-pre-gyp': 2.0.3