frontend nginx: no-cache on index.html so deploys aren't masked by stale SPA shell (Edge heuristic caching)

frontend/nginx-spa.conf

@@ -7,6 +7,14 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
+    # Never let the browser serve a stale SPA shell: it references hashed asset
+    # filenames, so a cached index.html strands users on an old build after a
+    # deploy (Edge heuristically caches it when no Cache-Control is set). Force
+    # revalidation — a cheap 304 when unchanged — so new deploys are picked up.
+    location = /index.html {
+        add_header Cache-Control "no-cache";
+    }
+
     location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2)$ {
         expires 1y;
         add_header Cache-Control "public, immutable";

milevault_export/frontend/nginx-spa.conf

@@ -7,6 +7,14 @@ server {
         try_files $uri $uri/ /index.html;
     }
 
+    # Never let the browser serve a stale SPA shell: it references hashed asset
+    # filenames, so a cached index.html strands users on an old build after a
+    # deploy (Edge heuristically caches it when no Cache-Control is set). Force
+    # revalidation — a cheap 304 when unchanged — so new deploys are picked up.
+    location = /index.html {
+        add_header Cache-Control "no-cache";
+    }
+
     location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2)$ {
         expires 1y;
         add_header Cache-Control "public, immutable";