diff --git a/frontend/src/app.d.ts b/frontend/src/app.d.ts
new file mode 100644
index 0000000..412c565
--- /dev/null
+++ b/frontend/src/app.d.ts
@@ -0,0 +1,16 @@
+// Ambient type declarations for SvelteKit + project-level build-time globals.
+
+declare global {
+	/** App version, injected from frontend/package.json at build time. */
+	const __APP_VERSION__: string;
+
+	namespace App {
+		// interface Error {}
+		// interface Locals {}
+		// interface PageData {}
+		// interface PageState {}
+		// interface Platform {}
+	}
+}
+
+export {};
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 777997b..8bd35e9 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,9 +1,18 @@
 import { sveltekit } from '@sveltejs/kit/vite';
 import tailwindcss from '@tailwindcss/vite';
 import { defineConfig } from 'vite';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+
+const pkg = JSON.parse(
+	readFileSync(fileURLToPath(new URL('./package.json', import.meta.url)), 'utf8'),
+);
 
 export default defineConfig({
 	plugins: [tailwindcss(), sveltekit()],
+	define: {
+		__APP_VERSION__: JSON.stringify(pkg.version),
+	},
 	server: {
 		port: 5175,
 		proxy: {