fix workbench illustration contrast

docs/CODEX_EXECUTION_LOG.md

@@ -12852,6 +12852,9 @@ Open:
   and a persistent horizontally scrollable bottom navigation rail.
 - Kept dual-display launching desktop-only and made the compact results drawer
   viewport-fixed above the phone navigation.
+- Reclaimed the unused operator-only column in the guest source catalog and
+  restored the intended dark, high-contrast surfaces for the PyTorch pipeline
+  and live project-atlas illustrations.
 
 ### Verification
 

frontend/src/styles/geointel-system.css

@@ -2387,3 +2387,37 @@ button.overview-command-card { cursor: pointer; }
   .geo-results-toggle { position: fixed; z-index: 131; }
   .geo-results-toggle-open { right: min(31rem, calc(100% - 2.75rem)); }
 }
+
+/* Full-workbench visual integrity: preserve the dark illustration surfaces
+   and reclaim operator-only columns in the read-only guest source view. */
+.detection-lab-shell > .ai-pipeline {
+  grid-column: 1 / -1;
+  background:
+    linear-gradient(115deg, rgba(255, 255, 255, 0.035), transparent 38%),
+    radial-gradient(circle at 82% 10%, rgba(69, 209, 177, 0.15), transparent 20rem),
+    #082f2b !important;
+}
+
+.project-atlas {
+  background:
+    radial-gradient(circle at 18% 0%, rgba(64, 190, 164, 0.18), transparent 25rem),
+    linear-gradient(135deg, #092f2b 0%, #0b3f39 48%, #082c34 100%) !important;
+}
+
+@media (min-width: 921px) {
+  .workbench-shell-guest .workspace-grid-data {
+    grid-template-columns: minmax(16rem, 0.55fr) minmax(0, 1.45fr);
+    grid-template-rows: minmax(0, 1fr);
+  }
+
+  .workbench-shell-guest .workspace-grid-data > .source-catalog-panel {
+    grid-column: 2;
+    grid-row: 1;
+  }
+
+  .workbench-shell-guest .workspace-grid-data > .guest-readonly-card {
+    grid-column: 1;
+    grid-row: 1;
+    align-self: start;
+  }
+}