fix: derive workbox version from package.json at build time

Instead of hardcoding the workbox version string in the service worker,
read it from workbox-precaching/package.json via Vite's define option.
This ensures the service worker always references the correct workbox
version that is actually installed.

Resolves #2549

frontend/src/sw.ts

@@ -1,9 +1,10 @@
 import {getFullBaseUrl} from './helpers/getFullBaseUrl'
 
 declare let self: ServiceWorkerGlobalScope
+declare const __WORKBOX_VERSION__: string
 
 const fullBaseUrl = getFullBaseUrl()
-const workboxVersion = 'v7.3.0'
+const workboxVersion = __WORKBOX_VERSION__
 
 importScripts(`${fullBaseUrl}workbox-${workboxVersion}/workbox-sw.js`)
 workbox.setConfig({

frontend/vite.config.ts

@@ -4,6 +4,7 @@ import {configDefaults} from 'vitest/config'
 import vue from '@vitejs/plugin-vue'
 import {URL, fileURLToPath} from 'node:url'
 import {dirname, resolve} from 'node:path'
+import {readFileSync} from 'node:fs'
 
 import VueI18nPlugin from '@intlify/unplugin-vue-i18n/vite'
 import {VitePWA} from 'vite-plugin-pwa'
@@ -103,8 +104,14 @@ export default defineConfig(({command, mode}) => {
 })
 
 function getBuildConfig(env: Record<string, string>) {
+	const workboxPkgPath = resolve(dirname(pathSrc), 'node_modules/workbox-precaching/package.json')
+	const workboxVersion = JSON.parse(readFileSync(workboxPkgPath, 'utf-8')).version
+
 	return {
 		base: env.VIKUNJA_FRONTEND_BASE,
+		define: {
+			__WORKBOX_VERSION__: JSON.stringify(`v${workboxVersion}`),
+		},
 		// https://vitest.dev/config/
 		test: {
 			environment: 'happy-dom',