fix(ui): keep burger menu in universal phone header

src/components/clinical-dashboard/global-search-shell.tsx

@@ -260,30 +260,6 @@ function readInitialBrowserSubmittedSearchParamString(): string {
  return params.get("run") === "1" && query ? search : "";
 }
 
-export function infoPageBackHref(pathname: string): string | null {
- if (pathname.startsWith("/services/")) return appModeHomeHref("services");
- if (pathname.startsWith("/forms/")) return appModeHomeHref("forms");
- if (pathname.startsWith("/medications/")) return appModeHomeHref("prescribing");
- if (pathname.startsWith("/differentials/")) return appModeHomeHref("differentials");
- if (pathname.startsWith("/dsm/")) return appModeHomeHref("dsm");
- if (pathname.startsWith("/specifiers/")) return appModeHomeHref("specifiers");
- if (pathname.startsWith("/formulation/")) return appModeHomeHref("formulation");
- if (pathname.startsWith("/therapy-compass/")) return appModeHomeHref("therapy-compass");
- if (pathname.startsWith("/factsheets/")) return appModeHomeHref("factsheets");
- if (pathname.startsWith("/documents/")) return documentsSearchHref();
- return null;
-}
-
-/** Stable in-app back target for non-info mobile back (e.g. submitted differential search). */
-export function mobileBackHref(pathname: string, searchMode: string, hasQuery: boolean): string | null {
- const infoHref = infoPageBackHref(pathname);
- if (infoHref) return infoHref;
- if (pathname === "/differentials" && searchMode === "differentials" && hasQuery) {
- return appModeHomeHref("differentials", { focus: true });
- }
- return null;
-}
-
 function isToolDetailWithFooterSearch(pathname: string): boolean {
  return (
  (pathname.startsWith("/services/") && pathname !== "/services") ||
@@ -864,27 +840,6 @@ function GlobalStandaloneSearchShellBody({
  onNewChat={startNewAnswerChat}
  showDesktopNewChat={!shouldShowDesktopSidebar}
  onOpenMobileSidebar={() => setMobileMenuOpen(true)}
- mobileLeadingAction={
- isInfoPage
- ? "back"
- : pathname === "/differentials" && searchMode === "differentials" && requestedQuery
- ? "back"
- : "menu"
- }
- onMobileBack={() => {
- const fallbackHref = mobileBackHref(pathname, searchMode, Boolean(requestedQuery));
- if (fallbackHref) {
- if (!isInfoPage) setQuery("");
- router.push(fallbackHref);
- return;
- }
- if (!isInfoPage) {
- setQuery("");
- navigateToMode(searchMode, { focus: true });
- return;
- }
- router.back();
- }}
  queryModeOptions={mockupQueryModeOptions}
  queryInputRef={inputRef}
  recentQueries={recentQueries}

src/components/clinical-dashboard/master-search-header.tsx

@@ -29,7 +29,6 @@ import {
  Search,
  Send,
  ShieldCheck,
- ArrowLeft,
  X,
 } from "lucide-react";
 
@@ -197,8 +196,6 @@ export function MasterSearchHeader({
  desktopPageComposerSlotId,
  heroComposerBreakpoint = "all",
  mobileBottomSearchAddonSlotId,
- mobileLeadingAction = "menu",
- onMobileBack,
  hideOnScroll,
  onBottomComposerHiddenChange,
  showDesktopNewChat = true,
@@ -263,8 +260,6 @@ export function MasterSearchHeader({
  heroComposerBreakpoint?: "all" | "sm-up";
  /** Mobile/tablet slot rendered above the search pill for page-specific composer addons. */
  mobileBottomSearchAddonSlotId?: string;
- mobileLeadingAction?: "menu" | "back";
- onMobileBack?: () => void;
  /** Phone-only hide-on-scroll for the universal header and bottom search dock.
  * "overlay" translates the sticky header away (host scrolls the document,
  * content already flows beneath); "collapse" also releases the header's
@@ -604,7 +599,6 @@ export function MasterSearchHeader({
  : "answer";
  const actionMenuItems = modeActionItemsFor(actionMenuSetId);
  const actionMenuButtonLabel = `Open ${selectedAppMode.label.toLowerCase()} options`;
- const useMobileBackControl = mobileLeadingAction === "back";
 
  function currentUsesScopeSheet() {
  return window.matchMedia(scopeSheetMediaQuery).matches;
@@ -2031,20 +2025,16 @@ export function MasterSearchHeader({
  <div className="flex min-w-0 items-center gap-2 sm:gap-3">
  <button
  type="button"
- onClick={useMobileBackControl ? onMobileBack : onOpenMobileSidebar}
+ onClick={onOpenMobileSidebar}
  className={cn(
  "universal-header-icon-control h-tap w-tap shrink-0 place-items-center rounded-full text-[color:var(--text-muted)] transition hover:bg-[color:var(--surface-subtle)] hover:text-[color:var(--text)] focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[color:var(--focus)]",
  // From md the desktop icon rail owns navigation, so the drawer
  // trigger is phone-only outside workflow headers.
- isWorkflowHeader || useMobileBackControl ? "grid" : "grid md:hidden",
+ isWorkflowHeader ? "grid" : "grid md:hidden",
  )}
- aria-label={useMobileBackControl ? "Go back" : "Open Clinical Guide menu"}
+ aria-label="Open Clinical Guide menu"
  >
- {useMobileBackControl ? (
- <ArrowLeft aria-hidden="true" className="h-5 w-5" />
- ) : (
- <Menu aria-hidden="true" className="h-5 w-5" />
- )}
+ <Menu aria-hidden="true" className="h-5 w-5" />
  </button>
  {isServicesMode ? (
  <div className="hidden min-w-0 items-center gap-3 lg:flex">