Add quota banner with HF login link in header

app.py

@@ -100,6 +100,23 @@ footer { display: none !important; }
 .app-title { font-size: 18px; font-weight: 600; letter-spacing: -0.015em; }
 .app-subtitle { font-size: 13px; color: var(--ink-muted); }
 
+.quota-banner {
+  font-size: 12px;
+  color: var(--ink-muted);
+  background: var(--accent-soft);
+  border: 1px solid var(--ink-faint);
+  border-radius: var(--radius-sm);
+  padding: 9px 14px;
+  margin: -16px 0 22px;
+  line-height: 1.5;
+}
+.quota-banner a {
+  color: var(--accent);
+  text-decoration: none;
+  font-weight: 500;
+}
+.quota-banner a:hover { text-decoration: underline; }
+
 /* File upload — compact, Apple-style */
 .upload-row { margin-bottom: 18px; }
 .upload-row .gr-file, .upload-row .file-preview { background: transparent !important; }
@@ -627,6 +644,11 @@ def build_app() -> gr.Blocks:
             '<div class="app-subtitle">Ask anything about your data.</div>'
             '</div>'
             '</div>'
+            '<div class="quota-banner">'
+            'Running on HF ZeroGPU. '
+            '<a href="https://huggingface.co/login" target="_blank" rel="noopener">Sign in to Hugging Face</a> '
+            'for the full daily GPU quota (anonymous users hit limits fast).'
+            '</div>'
         )
 
         # Upload