Fix manual company switch route sync

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/lib/company-selection.ts

@@ -0,0 +1,18 @@
+export type CompanySelectionSource = "manual" | "route_sync" | "bootstrap";
+
+export function shouldSyncCompanySelectionFromRoute(params: {
+  selectionSource: CompanySelectionSource;
+  selectedCompanyId: string | null;
+  routeCompanyId: string;
+}): boolean {
+  const { selectionSource, selectedCompanyId, routeCompanyId } = params;
+
+  if (selectedCompanyId === routeCompanyId) return false;
+
+  // Let manual company switches finish their remembered-path navigation first.
+  if (selectionSource === "manual" && selectedCompanyId) {
+    return false;
+  }
+
+  return true;
+}