feat(frontend): remove 'v' prefix from footer and add dev mode versioning

frontend/src/components/Footer.tsx

@@ -4,7 +4,7 @@ const Footer: React.FC = () => {
   return (
     <footer className="py-4 text-center">
       <p className="text-xs text-slate-500">
-        v{__APP_VERSION__} ({__APP_GITSHA__})
+        {__APP_VERSION__} ({__APP_GITSHA__})
       </p>
     </footer>
   );

frontend/vite.config.ts

@@ -2,9 +2,21 @@ import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
 import path from 'path'
+import { execSync } from 'child_process';
 
-const APP_VERSION = process.env.VITE_APP_VERSION || 'unknown';
+const isDev = process.env.NODE_ENV === 'development' || process.env.vite === 'true';
-const APP_GITSHA = process.env.VITE_APP_GITSHA || 'unknown';
+
+let APP_VERSION = process.env.VITE_APP_VERSION || 'unknown';
+let APP_GITSHA = process.env.VITE_APP_GITSHA || 'unknown';
+
+if (isDev) {
+  APP_VERSION = 'DEV';
+  try {
+    APP_GITSHA = execSync('git rev-parse --short HEAD').toString().trim();
+  } catch (e) {
+    APP_GITSHA = 'unknown';
+  }
+}
 
 export default defineConfig({
   base: './',