Reserve embedded report workspace height

app.py

@@ -219,6 +219,7 @@ def run_scan(target: str):
         result_json(result),
         _write_sbom(result),
         view_state,
+        gr.HTML(visible=False),
     )
 
 
@@ -265,6 +266,18 @@ APP_CSS = """
 .fullscreen-link:hover {
     border-color: var(--primary-500);
 }
+.height-reserve {
+    min-height: 52rem;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    text-align: center;
+    color: var(--body-text-color-subdued);
+    border: 1px dashed var(--border-color-primary);
+    border-radius: var(--radius-lg);
+    background: var(--background-fill-secondary);
+}
 """
 
 with gr.Blocks(title="ModelSentry", delete_cache=(600, 1800)) as demo:
@@ -337,6 +350,10 @@ with gr.Blocks(title="ModelSentry", delete_cache=(600, 1800)) as demo:
         with gr.Tab("JSON / SBOM"):
             report = gr.Code(language="json", label="modelsentry.scan.v4 JSON")
             sbom = gr.File(label="CycloneDX 1.6 SBOM", interactive=False)
+    height_reserve = gr.HTML(
+        '<div class="height-reserve"><h3>Results workspace ready</h3>'
+        '<p>Run a scan above. The focused inspectors will replace this placeholder without creating a second scrollbar.</p></div>'
+    )
     gr.Markdown(
         "ModelSentry performs bounded static analysis of untrusted public content. Findings require human review; "
         "absence of a finding is not proof of safety. Repository contents are not intentionally retained by this app; "
@@ -358,6 +375,7 @@ with gr.Blocks(title="ModelSentry", delete_cache=(600, 1800)) as demo:
         report,
         sbom,
         view_state,
+        height_reserve,
     ]
     scan.click(run_scan, inputs=target, outputs=outputs)
     target.submit(run_scan, inputs=target, outputs=outputs)