Prevent geographic explorer overflow

CHANGELOG.md

@@ -35,6 +35,8 @@
   project names and one-partition map counts no longer leak into the Map flow.
 - Removed the Kempen-only browser title now that the same workbench also
   operates at Flemish scope.
+- Let the geographic explorer switch to its two-row desktop layout before the
+  navigation rail makes the three-column map surface overflow.
 
 ## Sprint 235 Governed bathymetry profiles and Belgian scale architecture (2026-07-17)
 

backend/tests/test_sprint233_operational_completion.py

@@ -372,7 +372,7 @@ def test_map_and_detection_workspaces_avoid_page_length_driven_layouts() -> None
 
     assert "height: clamp(34rem, calc(100dvh - 10rem), 58rem);" in styles
     assert ".geo-theme-list" in styles and "overflow-y: auto;" in styles
-    assert "@media (max-width: 1240px)" in styles
+    assert "@media (max-width: 1500px)" in styles
     assert ".workspace-grid-ai {\n    grid-template-columns: minmax(0, 1fr);" in premium
     assert "max-height: none;" in premium
 

frontend/src/styles/app.css

@@ -6667,7 +6667,7 @@ section {
   }
 }
 
-@media (max-width: 1240px) {
+@media (max-width: 1500px) {
   .geo-explorer-layout {
     grid-template-columns: minmax(14rem, 16rem) minmax(28rem, 1fr);
     height: auto;