diff --git a/package-lock.json b/package-lock.json
index aac198a..d67a9f6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,20 +12,20 @@
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       },
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+        "node": "^22.17.0 || >=24.0.0"
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@@ -78,26 +78,6 @@
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@@ -395,537 +375,6 @@
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       "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.57.1.tgz",
diff --git a/package.json b/package.json
index 7746c47..0721f99 100644
--- a/package.json
+++ b/package.json
@@ -14,14 +14,14 @@
     "format:check": "prettier --check ."
   },
   "devDependencies": {
-    "@sveltejs/adapter-node": "^5.5.7",
-    "@sveltejs/kit": "^2.63.0",
+    "@sveltejs/adapter-node": "^6.0.0",
+    "@sveltejs/kit": "^3.0.0",
     "@sveltejs/vite-plugin-svelte": "^7.1.2",
     "@types/node": "^26.5.0",
     "prettier": "^3.9.6",
     "prettier-plugin-svelte": "^4.1.1",
-    "svelte": "^5.56.1",
-    "svelte-check": "^4.6.0",
+    "svelte": "^5.57.1",
+    "svelte-check": "^4.7.5",
     "typescript": "^6.0.3",
     "vite": "^8.0.16",
     "vitest": "^5.0.0"
@@ -52,13 +52,13 @@
     "LICENSE"
   ],
   "engines": {
-    "node": "^22.12.0 || >=24.0.0"
+    "node": "^22.17.0 || >=24.0.0"
   },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/NotAFlightRisk/ai-usage-dashboard.git"
   },
-  "overrides": {
-    "cookie": "^0.7.0"
+  "imports": {
+    "#lib/*": "./src/lib/*"
   }
 }
diff --git a/src/hooks.server.ts b/src/hooks.server.ts
index ff33557..6af180e 100644
--- a/src/hooks.server.ts
+++ b/src/hooks.server.ts
@@ -1,6 +1,6 @@
-import { boot } from '$lib/server/refresh';
-import { settings } from '$lib/server/settings';
-import type { Handle } from '@sveltejs/kit';
+import type { Handle } from '@sveltejs/kit/hooks';
+import { boot } from '#lib/server/refresh.js';
+import { settings } from '#lib/server/settings.js';
 
 boot();
 
diff --git a/src/lib/components/BarList.svelte b/src/lib/components/BarList.svelte
index c160222..cff4374 100644
--- a/src/lib/components/BarList.svelte
+++ b/src/lib/components/BarList.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import Mark from '$lib/logos/Mark.svelte';
+  import { tooltip } from '#lib/tooltip.js';
+  import Mark from '#lib/logos/Mark.svelte';
 
   type Row = {
     id: string;
diff --git a/src/lib/components/Calendar.svelte b/src/lib/components/Calendar.svelte
index b64d133..19fb065 100644
--- a/src/lib/components/Calendar.svelte
+++ b/src/lib/components/Calendar.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import { compact, dayLabel, money } from '$lib/format';
+  import { tooltip } from '#lib/tooltip.js';
+  import { compact, dayLabel, money } from '#lib/format.js';
 
   type Day = { day: string; total: number; cost: number | null; events: number };
 
diff --git a/src/lib/components/Clock.svelte b/src/lib/components/Clock.svelte
index 279f344..98caa94 100644
--- a/src/lib/components/Clock.svelte
+++ b/src/lib/components/Clock.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import { compact } from '$lib/format';
+  import { tooltip } from '#lib/tooltip.js';
+  import { compact } from '#lib/format.js';
 
   let { points }: { points: { day: number; hour: number; total: number }[] } = $props();
 
diff --git a/src/lib/components/Donut.svelte b/src/lib/components/Donut.svelte
index 6aa9507..717c534 100644
--- a/src/lib/components/Donut.svelte
+++ b/src/lib/components/Donut.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
+  import { tooltip } from '#lib/tooltip.js';
 
   let {
     slices,
diff --git a/src/lib/components/Fields.svelte b/src/lib/components/Fields.svelte
index 80d86ca..44987de 100644
--- a/src/lib/components/Fields.svelte
+++ b/src/lib/components/Fields.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
+  import { tooltip } from '#lib/tooltip.js';
 
   let {
     options,
diff --git a/src/lib/components/Figures.svelte b/src/lib/components/Figures.svelte
index 37d32da..82dd0b9 100644
--- a/src/lib/components/Figures.svelte
+++ b/src/lib/components/Figures.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import { compact, delta, full, money } from '$lib/format';
-  import type { Slice } from '$lib/types';
+  import { tooltip } from '#lib/tooltip.js';
+  import { compact, delta, full, money } from '#lib/format.js';
+  import type { Slice } from '#lib/types.js';
 
   let {
     totals,
diff --git a/src/lib/components/Meter.svelte b/src/lib/components/Meter.svelte
index e1d81a6..e8f579c 100644
--- a/src/lib/components/Meter.svelte
+++ b/src/lib/components/Meter.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import { relative } from '$lib/format';
-  import type { WindowRow } from '$lib/types';
+  import { tooltip } from '#lib/tooltip.js';
+  import { relative } from '#lib/format.js';
+  import type { WindowRow } from '#lib/types.js';
 
   let { window: meter }: { window: WindowRow } = $props();
 
diff --git a/src/lib/components/Panel.svelte b/src/lib/components/Panel.svelte
index 75746b1..97e4880 100644
--- a/src/lib/components/Panel.svelte
+++ b/src/lib/components/Panel.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import type { Snippet } from 'svelte';
-  import { tooltip } from '$lib/tooltip';
+  import { tooltip } from '#lib/tooltip.js';
 
   let {
     title,
diff --git a/src/lib/components/Problems.svelte b/src/lib/components/Problems.svelte
index b47dbb0..8d700d6 100644
--- a/src/lib/components/Problems.svelte
+++ b/src/lib/components/Problems.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
-  import { relative } from '$lib/format';
-  import type { Usage } from '$lib/types';
+  import { relative } from '#lib/format.js';
+  import type { Usage } from '#lib/types.js';
 
   let { problems }: { problems: Usage['problems'] } = $props();
 
diff --git a/src/lib/components/Segmented.svelte b/src/lib/components/Segmented.svelte
index 61cf808..9a0c94e 100644
--- a/src/lib/components/Segmented.svelte
+++ b/src/lib/components/Segmented.svelte
@@ -1,5 +1,5 @@
 <script lang="ts" generics="T extends string">
-  import { tooltip } from '$lib/tooltip';
+  import { tooltip } from '#lib/tooltip.js';
 
   let {
     options,
diff --git a/src/lib/components/Sessions.svelte b/src/lib/components/Sessions.svelte
index 21512b9..85e4243 100644
--- a/src/lib/components/Sessions.svelte
+++ b/src/lib/components/Sessions.svelte
@@ -1,6 +1,6 @@
 <script lang="ts" module>
-  import { clockLabel, compact, duration, modelName, money, percent } from '$lib/format';
-  import type { SessionRow } from '$lib/types';
+  import { clockLabel, compact, duration, modelName, money, percent } from '#lib/format.js';
+  import type { SessionRow } from '#lib/types.js';
 
   type Column = {
     id: string;
@@ -89,10 +89,10 @@
 </script>
 
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import Mark from '$lib/logos/Mark.svelte';
-  import { projectName } from '$lib/format';
-  import { toolMeta } from '$lib/providers';
+  import { tooltip } from '#lib/tooltip.js';
+  import Mark from '#lib/logos/Mark.svelte';
+  import { projectName } from '#lib/format.js';
+  import { toolMeta } from '#lib/providers.js';
 
   let {
     rows,
diff --git a/src/lib/components/Settings.svelte b/src/lib/components/Settings.svelte
index c722573..5a357bf 100644
--- a/src/lib/components/Settings.svelte
+++ b/src/lib/components/Settings.svelte
@@ -1,9 +1,9 @@
 <script lang="ts">
-  import { RANGES } from '$lib/range';
-  import { relative } from '$lib/format';
-  import { RATES, type Rate } from '$lib/pricing';
-  import { THEMES, type Theme } from '$lib/themes';
-  import type { Usage } from '$lib/types';
+  import { RANGES } from '#lib/range.js';
+  import { relative } from '#lib/format.js';
+  import { RATES, type Rate } from '#lib/pricing.js';
+  import { THEMES, type Theme } from '#lib/themes.js';
+  import type { Usage } from '#lib/types.js';
 
   type Saved = {
     theme: Theme;
diff --git a/src/lib/components/Split.svelte b/src/lib/components/Split.svelte
index 496d483..db0998b 100644
--- a/src/lib/components/Split.svelte
+++ b/src/lib/components/Split.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
+  import { tooltip } from '#lib/tooltip.js';
 
   let {
     parts
diff --git a/src/lib/components/Trend.svelte b/src/lib/components/Trend.svelte
index fb28370..a92d828 100644
--- a/src/lib/components/Trend.svelte
+++ b/src/lib/components/Trend.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
-  import { tooltip } from '$lib/tooltip';
-  import { compact, dayLabel, money, moneyCompact } from '$lib/format';
-  import type { DayPoint } from '$lib/types';
+  import { tooltip } from '#lib/tooltip.js';
+  import { compact, dayLabel, money, moneyCompact } from '#lib/format.js';
+  import type { DayPoint } from '#lib/types.js';
 
   let {
     series,
diff --git a/src/routes/+page.server.ts b/src/routes/+page.server.ts
index c22c36e..5cdc8b6 100644
--- a/src/routes/+page.server.ts
+++ b/src/routes/+page.server.ts
@@ -1,7 +1,7 @@
-import { filtersFrom } from '$lib/server/request';
-import { usage } from '$lib/server/queries';
-import { settings } from '$lib/server/settings';
-import { config } from '$lib/server/config';
+import { filtersFrom } from '#lib/server/request.js';
+import { usage } from '#lib/server/queries.js';
+import { settings } from '#lib/server/settings.js';
+import { config } from '#lib/server/config.js';
 import type { PageServerLoad } from './$types';
 
 export const load: PageServerLoad = ({ url }) => ({
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 7c84861..17fea71 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,25 +1,25 @@
 <script lang="ts">
   import { untrack } from 'svelte';
-  import { replaceState } from '$app/navigation';
-  import Panel from '$lib/components/Panel.svelte';
-  import Segmented from '$lib/components/Segmented.svelte';
-  import MultiSelect from '$lib/components/MultiSelect.svelte';
-  import Figures from '$lib/components/Figures.svelte';
-  import Calendar from '$lib/components/Calendar.svelte';
-  import Trend from '$lib/components/Trend.svelte';
-  import BarList from '$lib/components/BarList.svelte';
-  import Donut from '$lib/components/Donut.svelte';
-  import Split from '$lib/components/Split.svelte';
-  import Clock from '$lib/components/Clock.svelte';
-  import Meter from '$lib/components/Meter.svelte';
-  import Sessions, { COLUMNS } from '$lib/components/Sessions.svelte';
-  import Fields from '$lib/components/Fields.svelte';
-  import Problems from '$lib/components/Problems.svelte';
-  import SettingsDialog from '$lib/components/Settings.svelte';
-  import Logo from '$lib/logos/Logo.svelte';
-  import Mark from '$lib/logos/Mark.svelte';
-  import { tooltip } from '$lib/tooltip';
-  import { RANGES, rangeLabel } from '$lib/range';
+  import { goto } from '$app/navigation';
+  import Panel from '#lib/components/Panel.svelte';
+  import Segmented from '#lib/components/Segmented.svelte';
+  import MultiSelect from '#lib/components/MultiSelect.svelte';
+  import Figures from '#lib/components/Figures.svelte';
+  import Calendar from '#lib/components/Calendar.svelte';
+  import Trend from '#lib/components/Trend.svelte';
+  import BarList from '#lib/components/BarList.svelte';
+  import Donut from '#lib/components/Donut.svelte';
+  import Split from '#lib/components/Split.svelte';
+  import Clock from '#lib/components/Clock.svelte';
+  import Meter from '#lib/components/Meter.svelte';
+  import Sessions, { COLUMNS } from '#lib/components/Sessions.svelte';
+  import Fields from '#lib/components/Fields.svelte';
+  import Problems from '#lib/components/Problems.svelte';
+  import SettingsDialog from '#lib/components/Settings.svelte';
+  import Logo from '#lib/logos/Logo.svelte';
+  import Mark from '#lib/logos/Mark.svelte';
+  import { tooltip } from '#lib/tooltip.js';
+  import { RANGES, rangeLabel } from '#lib/range.js';
   import {
     compact,
     full,
@@ -28,9 +28,9 @@
     moneyCompact,
     projectName,
     relative
-  } from '$lib/format';
-  import { providerFor, providerMeta, toolMeta } from '$lib/providers';
-  import type { Usage } from '$lib/types';
+  } from '#lib/format.js';
+  import { providerFor, providerMeta, toolMeta } from '#lib/providers.js';
+  import type { Usage } from '#lib/types.js';
   import type { PageData } from './$types';
 
   let { data }: { data: PageData } = $props();
@@ -78,7 +78,7 @@
   $effect(() => {
     if (query === showing) return;
     showing = query;
-    replaceState(`?${query}`, {});
+    void goto(`?${query}`, { shallow: true, replace: true });
     void pull(query);
   });
 
@@ -92,19 +92,22 @@
     document.documentElement.dataset.theme = theme === 'auto' ? '' : theme;
   });
 
-  async function save(patch: Record<string, unknown>) {
-    const response = await fetch('/api/settings', {
+  const post = (path: string, body: Record<string, unknown> = {}) =>
+    fetch(path, {
       method: 'POST',
       headers: { 'content-type': 'application/json' },
-      body: JSON.stringify(patch)
+      body: JSON.stringify(body)
     });
+
+  async function save(patch: Record<string, unknown>) {
+    const response = await post('/api/settings', patch);
     if (response.ok) saved = await response.json();
   }
 
   async function rescan() {
     busy = true;
     try {
-      const response = await fetch(`/api/refresh?${showing}`, { method: 'POST' });
+      const response = await post(`/api/refresh?${showing}`);
       if (response.ok) usage = await response.json();
     } finally {
       busy = false;
diff --git a/src/routes/api/refresh/+server.ts b/src/routes/api/refresh/+server.ts
index 4452ba0..1d103dd 100644
--- a/src/routes/api/refresh/+server.ts
+++ b/src/routes/api/refresh/+server.ts
@@ -1,10 +1,9 @@
-import { json } from '@sveltejs/kit';
-import { refresh } from '$lib/server/refresh';
-import { filtersFrom } from '$lib/server/request';
-import { usage } from '$lib/server/queries';
+import { refresh } from '#lib/server/refresh.js';
+import { filtersFrom } from '#lib/server/request.js';
+import { usage } from '#lib/server/queries.js';
 import type { RequestHandler } from './$types';
 
 export const POST: RequestHandler = async ({ url }) => {
   await refresh(true);
-  return json(usage(filtersFrom(url)));
+  return Response.json(usage(filtersFrom(url)));
 };
diff --git a/src/routes/api/settings/+server.ts b/src/routes/api/settings/+server.ts
index a7ba0f5..3367297 100644
--- a/src/routes/api/settings/+server.ts
+++ b/src/routes/api/settings/+server.ts
@@ -1,15 +1,14 @@
-import { json } from '@sveltejs/kit';
-import { saveSettings, settings, type Settings } from '$lib/server/settings';
-import { clearUsageMemo } from '$lib/server/queries';
-import { refresh } from '$lib/server/refresh';
+import { saveSettings, settings, type Settings } from '#lib/server/settings.js';
+import { clearUsageMemo } from '#lib/server/queries.js';
+import { refresh } from '#lib/server/refresh.js';
 import type { RequestHandler } from './$types';
 
-export const GET: RequestHandler = () => json(settings());
+export const GET: RequestHandler = () => Response.json(settings());
 
 export const POST: RequestHandler = async ({ request }) => {
   const patch = (await request.json()) as Partial<Settings>;
   const next = saveSettings(patch);
   clearUsageMemo();
   if (patch.claudeWindows || patch.prices) await refresh();
-  return json(next);
+  return Response.json(next);
 };
diff --git a/src/routes/api/usage/+server.ts b/src/routes/api/usage/+server.ts
index 1ff41a8..999a2aa 100644
--- a/src/routes/api/usage/+server.ts
+++ b/src/routes/api/usage/+server.ts
@@ -1,6 +1,5 @@
-import { json } from '@sveltejs/kit';
-import { filtersFrom } from '$lib/server/request';
-import { usage } from '$lib/server/queries';
+import { filtersFrom } from '#lib/server/request.js';
+import { usage } from '#lib/server/queries.js';
 import type { RequestHandler } from './$types';
 
-export const GET: RequestHandler = ({ url }) => json(usage(filtersFrom(url)));
+export const GET: RequestHandler = ({ url }) => Response.json(usage(filtersFrom(url)));
diff --git a/tsconfig.json b/tsconfig.json
index c7b9df5..365c162 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,20 +1,9 @@
 {
-  "extends": "./.svelte-kit/tsconfig.json",
+  "extends": "$app/tsconfig",
   "compilerOptions": {
     "rewriteRelativeImportExtensions": true,
-    "allowJs": true,
-    "checkJs": true,
-    "esModuleInterop": true,
-    "forceConsistentCasingInFileNames": true,
-    "resolveJsonModule": true,
-    "skipLibCheck": true,
     "sourceMap": true,
-    "strict": true,
-    "moduleResolution": "bundler"
-  }
-  // Path aliases are handled by https://svelte.dev/docs/kit/configuration#alias
-  // except $lib which is handled by https://svelte.dev/docs/kit/configuration#files
-  //
-  // To make changes to top-level options such as include and exclude, we recommend extending
-  // the generated config; see https://svelte.dev/docs/kit/configuration#typescript
+    "strict": true
+  },
+  "include": ["src", "vite.config.ts", "tests"]
 }