Add VITE_APP_VERSION environment variable and integrate versioning into the application

- Introduced VITE_APP_VERSION in Dockerfile and GitHub workflows to capture the version from Git tags.
- Updated vite.config.ts to define a global constant for the app version.
- Enhanced Layout component to display the app version in the footer for admin pages.
- Added logic to conditionally render the LanguageSwitcher based on active promotions.

vite.config.ts

@@ -1,9 +1,26 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import { execSync } from 'child_process'
+
+// Get version from Git tag or fallback to 'dev'
+function getGitVersion(): string {
+  try {
+    // Try to get version from git tag
+    return execSync('git describe --tags --always', { encoding: 'utf-8' }).trim()
+  } catch {
+    return 'dev'
+  }
+}
+
+const appVersion = process.env.VITE_APP_VERSION || getGitVersion()
 
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [react()],
+  // Define global constants
+  define: {
+    __APP_VERSION__: JSON.stringify(appVersion),
+  },
   // Base path - use '/' for standalone Docker deployment
   // Change to '/cabinet/' if serving from a sub-path
   base: '/',