diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c83ec16..04145f7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,13 +10,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
-      - uses: pnpm/action-setup@v4
-        with:
-          version: 11
+      # Version is taken from package.json#packageManager; do not also set `version` here
+      # or action-setup fails with ERR_PNPM_BAD_PM_VERSION ("Multiple versions of pnpm").
+      - uses: pnpm/action-setup@v6
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 24
           cache: pnpm
diff --git a/src/app/api/analyze/route.test.ts b/src/app/api/analyze/route.test.ts
index c738a98..2365060 100644
--- a/src/app/api/analyze/route.test.ts
+++ b/src/app/api/analyze/route.test.ts
@@ -253,7 +253,9 @@ describe("POST /api/analyze", () => {
   });
 
   it("returns 500 when analyzer throws an error", async () => {
-    const mockAnalyzeProject = vi.fn().mockRejectedValue(new Error("Parsing failed"));
+    const mockAnalyzeProject = vi
+      .fn()
+      .mockRejectedValue(new Error("Parsing failed"));
 
     mockGetAnalyzer.mockReturnValue({
       language: "python",
@@ -268,7 +270,9 @@ describe("POST /api/analyze", () => {
       }),
     });
 
-    const consoleErrorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
+    const consoleErrorSpy = vi
+      .spyOn(console, "error")
+      .mockImplementation(() => {});
 
     const res = await POST(req);
     expect(res.status).toBe(500);
diff --git a/src/app/globals.css b/src/app/globals.css
index a79fb3f..415aebd 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -258,7 +258,9 @@ html.dark .react-flow__attribution {
 
 /* ---- React Flow Custom Node & Selection overrides ---- */
 .react-flow__node {
-  transition: border-color 0.25s, box-shadow 0.25s !important;
+  transition:
+    border-color 0.25s,
+    box-shadow 0.25s !important;
 }
 
 .react-flow__node:hover {
@@ -278,4 +280,3 @@ html.dark .react-flow__node.selected {
   border-color: var(--color-brand-dark) !important;
   box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.4) !important;
 }
-
diff --git a/src/components/layout/Header.tsx b/src/components/layout/Header.tsx
index 5270902..7d19f7a 100644
--- a/src/components/layout/Header.tsx
+++ b/src/components/layout/Header.tsx
@@ -137,9 +137,7 @@ export default function Header({
     );
 
   return (
-    <header
-      className="sticky top-0 z-50 flex items-center justify-between gap-3 px-4 py-3.5 sm:grid sm:grid-cols-[1fr_auto_1fr] sm:px-6 sm:py-4 border-b border-[#e2e8f0] dark:border-[#232a36] backdrop-blur-xl bg-white/80 dark:bg-[#0b0d12]/80"
-    >
+    <header className="sticky top-0 z-50 flex items-center justify-between gap-3 px-4 py-3.5 sm:grid sm:grid-cols-[1fr_auto_1fr] sm:px-6 sm:py-4 border-b border-[#e2e8f0] dark:border-[#232a36] backdrop-blur-xl bg-white/80 dark:bg-[#0b0d12]/80">
       {/* ── Left: brand ── */}
       <Link
         href={`/${lang}`}
@@ -339,7 +337,9 @@ export default function Header({
                           : "text-ink-soft hover:bg-slate-50 hover:text-ink dark:text-muted dark:hover:bg-surface-hover dark:hover:text-fg"
                       }`}
                     >
-                      <span>{LANGUAGE_NAMES[locale] ?? locale.toUpperCase()}</span>
+                      <span>
+                        {LANGUAGE_NAMES[locale] ?? locale.toUpperCase()}
+                      </span>
                       {active && <span className="text-[10px]">✓</span>}
                     </Link>
                   );
diff --git a/src/components/sections/TestimonialForm.tsx b/src/components/sections/TestimonialForm.tsx
index a6b0f0d..fae3dbc 100644
--- a/src/components/sections/TestimonialForm.tsx
+++ b/src/components/sections/TestimonialForm.tsx
@@ -2,10 +2,7 @@
 
 import { useActionState, useEffect, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
-import {
-  postTestimonial,
-  type TestimonialFormState,
-} from "@/lib/testimonials";
+import { postTestimonial, type TestimonialFormState } from "@/lib/testimonials";
 
 const INITIAL: TestimonialFormState = { ok: false };
 
diff --git a/src/components/sections/TestimonialsBoard.tsx b/src/components/sections/TestimonialsBoard.tsx
index 2109206..dfb00fc 100644
--- a/src/components/sections/TestimonialsBoard.tsx
+++ b/src/components/sections/TestimonialsBoard.tsx
@@ -95,7 +95,9 @@ export default function TestimonialsBoard({
         featured ? "lg:col-span-2" : ""
       }`}
     >
-      {item.rating ? <Stars value={item.rating} size={featured ? 18 : 15} /> : null}
+      {item.rating ? (
+        <Stars value={item.rating} size={featured ? 18 : 15} />
+      ) : null}
       <p
         className={`leading-[1.65] text-[#0f172a] dark:text-[#e6e9ef] ${
           featured ? "text-lg" : "text-[15px]"
diff --git a/src/components/ui/CodeWorkspace.tsx b/src/components/ui/CodeWorkspace.tsx
index b9514fe..7bc23bb 100644
--- a/src/components/ui/CodeWorkspace.tsx
+++ b/src/components/ui/CodeWorkspace.tsx
@@ -304,7 +304,16 @@ export default function CodeWorkspace({
     } finally {
       setIsLoading(false);
     }
-  }, [isLoading, mode, files, language, code, setGraph, setError, setIsLoading]);
+  }, [
+    isLoading,
+    mode,
+    files,
+    language,
+    code,
+    setGraph,
+    setError,
+    setIsLoading,
+  ]);
 
   async function handleSave() {
     if (!graph || saving) return;
@@ -340,8 +349,6 @@ export default function CodeWorkspace({
     setFiles(null); // file extensions differ per language
   }
 
-
-
   function syncScroll(e: React.UIEvent<HTMLTextAreaElement>) {
     if (gutterRef.current)
       gutterRef.current.scrollTop = e.currentTarget.scrollTop;
@@ -425,7 +432,7 @@ export default function CodeWorkspace({
                 <div key={i}>{i + 1}</div>
               ))}
             </div>
-             <textarea
+            <textarea
               value={code}
               onChange={(e) => setCode(e.target.value)}
               onScroll={syncScroll}
diff --git a/src/components/ui/Diagram.tsx b/src/components/ui/Diagram.tsx
index af1ff57..1af36ff 100644
--- a/src/components/ui/Diagram.tsx
+++ b/src/components/ui/Diagram.tsx
@@ -456,7 +456,9 @@ function DiagramFlow({
     const height = bounds.height + padding * 2;
 
     // 2. Locate the viewport element inside React Flow DOM
-    const viewport = document.querySelector(".react-flow__viewport") as HTMLElement | null;
+    const viewport = document.querySelector(
+      ".react-flow__viewport",
+    ) as HTMLElement | null;
     if (!viewport) return;
 
     // 3. Set background color relative to format and theme
@@ -564,7 +566,10 @@ function DiagramFlow({
 
         {/* Separator */}
         {legend.length > 0 && (
-          <div className="w-[1px] h-3.5 bg-[#e2e8f0] dark:bg-[#232a36] mx-0.5" aria-hidden="true" />
+          <div
+            className="w-[1px] h-3.5 bg-[#e2e8f0] dark:bg-[#232a36] mx-0.5"
+            aria-hidden="true"
+          />
         )}
 
         {/* Export Dropdown Selector */}
@@ -640,10 +645,7 @@ function DiagramFlow({
   );
 }
 
-export default function Diagram(props: {
-  graph: Graph;
-  emptyLabel: string;
-}) {
+export default function Diagram(props: { graph: Graph; emptyLabel: string }) {
   return (
     <ReactFlowProvider>
       <DiagramFlow {...props} />
diff --git a/src/db/index.ts b/src/db/index.ts
index 429cd8e..85e1c9c 100644
--- a/src/db/index.ts
+++ b/src/db/index.ts
@@ -4,12 +4,15 @@ import { drizzle } from "drizzle-orm/libsql";
 import * as schema from "./schema";
 
 const url = process.env.TURSO_DATABASE_URL;
-if (!url) {
+// `next build` imports route modules to collect data; allow it to run without a
+// real database. At runtime the URL is still required.
+const isBuild = process.env.NEXT_PHASE === "phase-production-build";
+if (!url && !isBuild) {
   throw new Error("TURSO_DATABASE_URL is not set");
 }
 
 const client = createClient({
-  url,
+  url: url ?? "file::memory:",
   authToken: process.env.TURSO_AUTH_TOKEN,
 });
 
diff --git a/src/lib/validation.test.ts b/src/lib/validation.test.ts
index 874763e..0b2b582 100644
--- a/src/lib/validation.test.ts
+++ b/src/lib/validation.test.ts
@@ -8,7 +8,10 @@ import {
 
 describe("graphMetaSchema", () => {
   test("rejects an empty title", () => {
-    const result = graphMetaSchema.safeParse({ title: "  ", language: "python" });
+    const result = graphMetaSchema.safeParse({
+      title: "  ",
+      language: "python",
+    });
     expect(result.success).toBe(false);
   });
 
diff --git a/src/lib/validation.ts b/src/lib/validation.ts
index 447d88b..a934a8b 100644
--- a/src/lib/validation.ts
+++ b/src/lib/validation.ts
@@ -16,11 +16,15 @@ export const graphMetaSchema = z.object({
 // loose objects rather than re-declaring the whole type.
 export const graphSchema = z.object({
   nodes: z
-    .array(z.object({ id: z.string(), label: z.string(), type: z.string() }).loose())
+    .array(
+      z.object({ id: z.string(), label: z.string(), type: z.string() }).loose(),
+    )
     .max(5000),
   edges: z
     .array(
-      z.object({ source: z.string(), target: z.string(), kind: z.string() }).loose(),
+      z
+        .object({ source: z.string(), target: z.string(), kind: z.string() })
+        .loose(),
     )
     .max(20000),
 });