feat(fusion_plating_portal): hide customer sidebar from internal staff + redirect them to the clock portal

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

fusion_plating/fusion_plating_portal/static/src/scss/fp_portal_sidebar.scss

@@ -21,6 +21,14 @@
     }
 }
 
+// Internal staff (employee portal) — no customer sidebar. Collapse the grid
+// to a single column so page content isn't pushed right by the now-empty
+// 240px sidebar track.
+.o_fp_portal_shell--no-sidebar {
+    grid-template-columns: 1fr;
+    gap: 0;
+}
+
 .o_fp_portal_sidebar {
     position: sticky;
     top: $fp-space-4;