update navbar, fix versioning

vite.config.js

@@ -1,10 +1,33 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
+import { execSync } from 'child_process'
+
+// Derive version from git tags; fall back to commit hash
+function getGitVersion() {
+  try {
+    // If there's a tag pointing at HEAD, use it exactly (e.g. "v1.2.0")
+    // Otherwise use "v0.0.0-<hash>[-dirty]"
+    const raw = execSync('git describe --tags --always --dirty', { stdio: ['pipe', 'pipe', 'ignore'] })
+      .toString()
+      .trim();
+    // If it looks like a pure tag (no dashes after the tag part) return as-is
+    return raw;
+  } catch {
+    return 'dev';
+  }
+}
+
+const APP_VERSION = getGitVersion();
+console.log(`[vite] App version: ${APP_VERSION}`);
 
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react(), tailwindcss()],
+  define: {
+    // Injected at build time — available as __APP_VERSION__ in source
+    __APP_VERSION__: JSON.stringify(APP_VERSION),
+  },
   server: {
     proxy: {
       '/api': {