Improve profile UI/UX and fix nginx JS cache

- Profile view: gradient hero banner with overlapping avatar, status badges (phone verified, email, pro state), gender field, city from flat API endpoint, manual validation
- nginx: JS files use no-cache/must-revalidate instead of 1y immutable to prevent stale deploys

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nginx.conf

@@ -7,17 +7,32 @@ server {
         rewrite ^ /favicon.png permanent;
     }
 
-    # Flutter Web SPA — all routes go to index.html
-    location / {
+    # HTML, manifest y service worker: nunca en cache
+    location ~* \.(html|json)$ {
+        expires -1;
+        add_header Cache-Control "no-cache, no-store, must-revalidate";
+        add_header Pragma "no-cache";
         try_files $uri $uri/ /index.html;
     }
 
-    # Cache static assets
-    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
+    # JS: revalidar siempre (304 si no cambió → rápido, pero nunca sirve stale)
+    location ~* \.js$ {
+        expires 0;
+        add_header Cache-Control "no-cache, must-revalidate";
+        try_files $uri =404;
+    }
+
+    # Imágenes, fuentes e íconos: cache larga (no cambian sin renombrar)
+    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
         expires 1y;
         add_header Cache-Control "public, immutable";
     }
 
+    # Flutter Web SPA
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
     gzip on;
     gzip_types text/plain text/css application/json application/javascript text/javascript;
 }