Customizable mobile bottom nav: fixed Map + 3 user-picked tabs + fixed Profile

- Add useNavPreferences hook (localStorage) with a curated catalog of pinnable
  destinations (Lab, Events, Crews, Wallet, Stash, Collections, Contacts,
  Messages, Stats), defaults, normalization/validation and login-gating
- Map (Shops & Spots) is fixed on the left; Profile/Login fixed on the right;
  the 3 middle slots are user-customizable — nothing is ever lost since the
  burger menu still lists everything
- CustomizeNavSheet: bottom-sheet editor with a live preview bar (locked slots
  shown with 🔒), a toggle grid with a 3/3 counter + "bar full" state, up/down
  reordering, and reset-to-default. Draft state so changes are cancelable
- Entry points: long-press (or right-click) any bottom tab, plus a "Customize
  nav bar" item in the burger menu
- Login-gated tabs are hidden from logged-out users and gracefully fall back if
  a saved layout references them
- Resolve tabs in Layout and pass to MobileNav as props (avoids any module-init
  ordering issues with the hoisted MobileNav declaration); defensive ?? [] guard

Docs unchanged (client-only preference, no new Nostr kinds).

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/components/CustomizeNavSheet.tsx

@@ -0,0 +1,252 @@
+import { useEffect, useState } from 'react';
+import { Sheet, SheetContent, SheetHeader, SheetTitle, SheetDescription } from '@/components/ui/sheet';
+import { Button } from '@/components/ui/button';
+import {
+  useNavPreferences,
+  MIDDLE_SLOTS,
+  type NavTab,
+} from '@/hooks/useNavPreferences';
+import { useCurrentUser } from '@/hooks/useCurrentUser';
+import { useTranslation } from '@/contexts/LanguageContext';
+import { cn } from '@/lib/utils';
+import { MapPin, User, Lock, ArrowUp, ArrowDown, RotateCcw, Check, Sparkles } from 'lucide-react';
+
+interface CustomizeNavSheetProps {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+}
+
+/**
+ * Bottom-sheet editor for the mobile nav bar.
+ *
+ * Layout model: Map (fixed left) · 3 user-picked · Profile (fixed right).
+ * The user toggles up to 3 destinations from the catalog and can reorder them.
+ * Draft state is local until "Done", so changes feel deliberate and cancelable.
+ */
+export function CustomizeNavSheet({ open, onOpenChange }: CustomizeNavSheetProps) {
+  const { middleIds, setMiddleIds, reset, catalog } = useNavPreferences();
+  const { user } = useCurrentUser();
+  const { t } = useTranslation();
+
+  // Local draft so we can cancel without persisting.
+  const [draft, setDraft] = useState<string[]>(middleIds);
+
+  // Re-seed the draft whenever the sheet opens.
+  useEffect(() => {
+    if (open) setDraft(middleIds);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [open]);
+
+  const isLoggedIn = !!user;
+  const full = draft.length >= MIDDLE_SLOTS;
+
+  const label = (tab: NavTab) => (tab.labelKey ? t(tab.labelKey) : tab.label);
+
+  const toggle = (id: string) => {
+    setDraft((prev) => {
+      if (prev.includes(id)) return prev.filter((x) => x !== id);
+      if (prev.length >= MIDDLE_SLOTS) return prev; // full — ignore
+      return [...prev, id];
+    });
+  };
+
+  const move = (id: string, dir: -1 | 1) => {
+    setDraft((prev) => {
+      const idx = prev.indexOf(id);
+      const next = idx + dir;
+      if (idx < 0 || next < 0 || next >= prev.length) return prev;
+      const copy = [...prev];
+      [copy[idx], copy[next]] = [copy[next], copy[idx]];
+      return copy;
+    });
+  };
+
+  const save = () => {
+    setMiddleIds(draft);
+    onOpenChange(false);
+  };
+
+  const handleReset = () => {
+    reset();
+    // reset() writes defaults; reseed draft from the same default source.
+    setDraft(['lab', 'events', 'crews']);
+  };
+
+  // Resolve draft ids to tabs for the preview & reorder list.
+  const draftTabs = draft
+    .map((id) => catalog.find((c) => c.id === id))
+    .filter((c): c is NavTab => !!c);
+
+  return (
+    <Sheet open={open} onOpenChange={onOpenChange}>
+      <SheetContent
+        side="bottom"
+        className="max-h-[90vh] overflow-y-auto rounded-t-3xl border-t border-white/10 bg-black/95 backdrop-blur"
+      >
+        <SheetHeader className="text-left">
+          <SheetTitle className="flex items-center gap-2 text-xl font-black uppercase text-[#ff0040]">
+            <Sparkles className="h-5 w-5" /> Customize your bar
+          </SheetTitle>
+          <SheetDescription className="text-gray-400">
+            Pick the {MIDDLE_SLOTS} tabs you use most. Everything else stays in the menu.
+          </SheetDescription>
+        </SheetHeader>
+
+        {/* Live preview */}
+        <div className="mt-4">
+          <p className="mb-2 text-[10px] font-bold uppercase tracking-widest text-gray-500">Preview</p>
+          <div className="glass flex items-stretch justify-around gap-1 rounded-2xl border border-white/10 p-2">
+            {/* Fixed Map */}
+            <PreviewSlot icon={MapPin} label={t('nav.map')} locked accent="#ff0040" />
+            {/* Middle draft */}
+            {Array.from({ length: MIDDLE_SLOTS }).map((_, i) => {
+              const tab = draftTabs[i];
+              if (!tab) {
+                return (
+                  <div
+                    key={`empty-${i}`}
+                    className="flex flex-1 flex-col items-center justify-center gap-1 rounded-xl border border-dashed border-white/10 py-1.5 text-gray-700"
+                  >
+                    <span className="text-lg leading-none">+</span>
+                    <span className="text-[9px] font-semibold uppercase">Empty</span>
+                  </div>
+                );
+              }
+              return <PreviewSlot key={tab.id} icon={tab.icon} label={label(tab)} accent="#ff0040" />;
+            })}
+            {/* Fixed Profile */}
+            <PreviewSlot icon={User} label={isLoggedIn ? 'Profile' : 'Log In'} locked accent="#ff0040" />
+          </div>
+        </div>
+
+        {/* Reorder chosen tabs */}
+        {draftTabs.length > 0 && (
+          <div className="mt-5">
+            <p className="mb-2 text-[10px] font-bold uppercase tracking-widest text-gray-500">
+              Order ({draft.length}/{MIDDLE_SLOTS})
+            </p>
+            <div className="space-y-1.5">
+              {draftTabs.map((tab, i) => (
+                <div
+                  key={tab.id}
+                  className="flex items-center gap-3 rounded-xl border border-[#ff0040]/30 bg-[#ff0040]/[0.06] p-2.5"
+                >
+                  <tab.icon className="h-4 w-4 text-[#ff0040]" />
+                  <span className="flex-1 text-sm font-bold text-white">{label(tab)}</span>
+                  <button
+                    type="button"
+                    onClick={() => move(tab.id, -1)}
+                    disabled={i === 0}
+                    aria-label={`Move ${label(tab)} up`}
+                    className="rounded-lg p-1.5 text-gray-400 transition-colors hover:bg-white/5 hover:text-white disabled:opacity-30"
+                  >
+                    <ArrowUp className="h-4 w-4" />
+                  </button>
+                  <button
+                    type="button"
+                    onClick={() => move(tab.id, 1)}
+                    disabled={i === draftTabs.length - 1}
+                    aria-label={`Move ${label(tab)} down`}
+                    className="rounded-lg p-1.5 text-gray-400 transition-colors hover:bg-white/5 hover:text-white disabled:opacity-30"
+                  >
+                    <ArrowDown className="h-4 w-4" />
+                  </button>
+                </div>
+              ))}
+            </div>
+          </div>
+        )}
+
+        {/* Catalog picker */}
+        <div className="mt-5">
+          <div className="mb-2 flex items-center justify-between">
+            <p className="text-[10px] font-bold uppercase tracking-widest text-gray-500">Available tabs</p>
+            {full && (
+              <span className="text-[10px] font-bold text-amber-400">
+                Bar full — remove one to swap
+              </span>
+            )}
+          </div>
+          <div className="grid grid-cols-3 gap-2">
+            {catalog.map((tab) => {
+              const selected = draft.includes(tab.id);
+              const gatedOut = tab.authOnly && !isLoggedIn;
+              const disabled = gatedOut || (!selected && full);
+              return (
+                <button
+                  key={tab.id}
+                  type="button"
+                  onClick={() => !gatedOut && toggle(tab.id)}
+                  disabled={disabled}
+                  aria-pressed={selected}
+                  className={cn(
+                    'relative flex flex-col items-center justify-center gap-1.5 rounded-2xl border p-3 transition-all active:scale-95',
+                    selected
+                      ? 'border-[#ff0040] bg-[#ff0040]/15 text-white shadow-[0_0_12px_rgba(255,0,64,0.25)]'
+                      : 'border-white/10 bg-white/[0.03] text-gray-300',
+                    !selected && !disabled && 'hover:border-[#ff0040]/40 hover:text-white',
+                    disabled && 'cursor-not-allowed opacity-40',
+                  )}
+                >
+                  {selected && (
+                    <span className="absolute right-1.5 top-1.5 flex h-4 w-4 items-center justify-center rounded-full bg-[#ff0040]">
+                      <Check className="h-2.5 w-2.5 text-white" />
+                    </span>
+                  )}
+                  <tab.icon className={cn('h-5 w-5', selected ? 'text-[#ff0040]' : '')} />
+                  <span className="text-[11px] font-bold uppercase leading-tight">{label(tab)}</span>
+                  {gatedOut && (
+                    <span className="flex items-center gap-0.5 text-[8px] font-bold text-gray-500">
+                      <Lock className="h-2 w-2" /> Log in
+                    </span>
+                  )}
+                </button>
+              );
+            })}
+          </div>
+        </div>
+
+        {/* Footer actions */}
+        <div className="mt-6 flex items-center gap-3 pb-2">
+          <Button
+            variant="outline"
+            onClick={handleReset}
+            className="gap-2 border-white/15 text-gray-300 hover:text-white"
+          >
+            <RotateCcw className="h-4 w-4" /> Reset
+          </Button>
+          <Button
+            onClick={save}
+            className="flex-1 gap-2 bg-[#ff0040] font-black uppercase text-white hover:bg-[#ff0040]/90"
+          >
+            <Check className="h-4 w-4" /> Done
+          </Button>
+        </div>
+      </SheetContent>
+    </Sheet>
+  );
+}
+
+function PreviewSlot({
+  icon: Icon,
+  label,
+  locked,
+  accent,
+}: {
+  icon: NavTab['icon'];
+  label: string;
+  locked?: boolean;
+  accent: string;
+}) {
+  return (
+    <div className="relative flex flex-1 flex-col items-center justify-center gap-0.5 py-1.5">
+      {locked && (
+        <span className="absolute right-0.5 top-0 text-gray-600">
+          <Lock className="h-2.5 w-2.5" />
+        </span>
+      )}
+      <Icon className="h-[22px] w-[22px]" style={{ color: locked ? accent : accent }} />
+      <span className="text-[9px] font-semibold uppercase leading-tight text-gray-300">{label}</span>
+    </div>
+  );
+}

src/components/Layout.tsx

@@ -1,6 +1,8 @@
-import { useState } from 'react';
+import { useState, useRef } from 'react';
 import { Link, useLocation } from 'react-router-dom';
 import { cn } from '@/lib/utils';
+import { CustomizeNavSheet } from '@/components/CustomizeNavSheet';
+import { useNavPreferences, type NavTab } from '@/hooks/useNavPreferences';
 import { Button } from '@/components/ui/button';
 import { Badge } from '@/components/ui/badge';
 import { Sheet, SheetContent, SheetTrigger, SheetTitle } from '@/components/ui/sheet';
@@ -46,6 +48,7 @@ import {
   CreditCard,
   Radio,
   Users,
+  SlidersHorizontal,
 } from 'lucide-react';
 import { OfflineIndicator } from '@/components/OfflineIndicator';
 import { UserStatusIndicator } from '@/components/UserStatusIndicator';
@@ -233,6 +236,9 @@ function MobileNav({
   userAvatar,
   userName,
   t,
+  onCustomize,
+  fixedMapTab,
+  middleTabs,
 }: {
   isActive: (path: string) => boolean;
   cashuBalance: number;
@@ -241,45 +247,61 @@ function MobileNav({
   userAvatar?: string;
   userName?: string;
   t: (key: string) => string;
+  onCustomize: () => void;
+  fixedMapTab: NavTab;
+  middleTabs: NavTab[];
 }) {
-  // Decide which tabs to show — max 5 on small screens
+  // Bar model: FIXED Map · 3 user-picked middle tabs · FIXED Profile.
-  // Logged in: Home, Map, Lab, Events, Profile (wallet in profile dropdown)
+  // (tabs are resolved in Layout and passed in to avoid any module-init/TDZ
-  // Logged out: Home, Map, Lab, Events, Login
+  //  ordering issues with the hoisted function declaration.)
-  const tabs = [
-    ...navItemKeys,
-    ...(isLoggedIn
-      ? [{ href: '/wallet', labelKey: 'nav.wallet', icon: Wallet }]
-      : []),
-  ];
 
-  return (
+  // Middle tabs the user pinned. If a login-gated tab is pinned while logged
-    <nav className="fixed bottom-0 left-0 right-0 z-50 md:hidden">
+  // out, fall back to a sensible public tab so the slot is never dead.
-      {/* Nav bar */}
+  const resolvedMiddle = (middleTabs ?? []).map((tab) => {
-      <div
+    if (tab.authOnly && !isLoggedIn) {
-        className="glass border-t border-white/10"
+      return { ...tab, href: '/lab', label: 'The Lab', labelKey: 'nav.lab' };
-        style={{ paddingBottom: 'env(safe-area-inset-bottom, 0px)', paddingLeft: 'env(safe-area-inset-left, 0px)', paddingRight: 'env(safe-area-inset-right, 0px)' }}
+    }
-      >
+    return tab;
-        <div className="flex items-stretch justify-around px-1 pt-1 pb-1">
+  });
-          {tabs.map((item) => {
+
-            const active = isActive(item.href);
+  // Long-press (touch) / right-click opens the customization sheet.
-            const isWallet = item.href === '/wallet';
+  const pressTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const startPress = () => {
+    pressTimer.current = setTimeout(() => {
+      onCustomize();
+      pressTimer.current = null;
+    }, 500);
+  };
+  const cancelPress = () => {
+    if (pressTimer.current) {
+      clearTimeout(pressTimer.current);
+      pressTimer.current = null;
+    }
+  };
+
+  const renderTab = (tab: NavTab, key: string) => {
+    const active = isActive(tab.href);
+    const isWallet = tab.id === 'wallet';
+    const accent = isWallet ? 'text-orange-400' : 'text-[#ff0040]';
+    const dot = isWallet ? 'bg-orange-400' : 'bg-[#ff0040]';
     return (
       <Link
-                key={item.href}
+        key={key}
-                to={item.href}
+        to={tab.href}
+        onTouchStart={startPress}
+        onTouchEnd={cancelPress}
+        onTouchMove={cancelPress}
+        onContextMenu={(e) => {
+          e.preventDefault();
+          onCustomize();
+        }}
         className={cn(
           'relative flex flex-col items-center justify-center gap-0.5 py-1.5 px-1 rounded-xl transition-all duration-150 flex-1 touch-manipulation active:scale-90',
-                  active
+          active ? accent : 'text-gray-500',
-                    ? isWallet ? 'text-orange-400' : 'text-[#ff0040]'
-                    : 'text-gray-500'
         )}
       >
-                {/* Active indicator dot */}
         {active && (
-                  <span className={cn(
+          <span className={cn('absolute top-0 left-1/2 -translate-x-1/2 w-1 h-1 rounded-full', dot)} />
-                    'absolute top-0 left-1/2 -translate-x-1/2 w-1 h-1 rounded-full',
-                    isWallet ? 'bg-orange-400' : 'bg-[#ff0040]'
-                  )} />
         )}
         {isWallet ? (
           <div className="relative">
@@ -291,18 +313,39 @@ function MobileNav({
             )}
           </div>
         ) : (
-                  <item.icon className={cn('h-[22px] w-[22px] transition-transform', active && 'scale-110')} />
+          <tab.icon className={cn('h-[22px] w-[22px] transition-transform', active && 'scale-110')} />
         )}
         <span className="text-[9px] xs:text-[10px] font-semibold leading-tight tracking-wide uppercase">
-                  {t(item.labelKey)}
+          {tab.labelKey ? t(tab.labelKey) : tab.label}
         </span>
       </Link>
     );
-          })}
+  };
 
-          {/* Profile / Login tab — always lands on Settings root */}
+  return (
+    <nav className="fixed bottom-0 left-0 right-0 z-50 md:hidden">
+      {/* Nav bar */}
+      <div
+        className="glass border-t border-white/10"
+        style={{ paddingBottom: 'env(safe-area-inset-bottom, 0px)', paddingLeft: 'env(safe-area-inset-left, 0px)', paddingRight: 'env(safe-area-inset-right, 0px)' }}
+      >
+        <div className="flex items-stretch justify-around px-1 pt-1 pb-1">
+          {/* FIXED: Map / Shops & Spots */}
+          {renderTab(fixedMapTab, 'fixed-map')}
+
+          {/* CUSTOM: 3 middle tabs */}
+          {resolvedMiddle.map((tab, i) => renderTab(tab, `mid-${tab.id}-${i}`))}
+
+          {/* FIXED: Profile / Login tab — always lands on Settings root */}
           <Link
             to="/settings"
+            onTouchStart={startPress}
+            onTouchEnd={cancelPress}
+            onTouchMove={cancelPress}
+            onContextMenu={(e) => {
+              e.preventDefault();
+              onCustomize();
+            }}
             className={cn(
               'relative flex flex-col items-center justify-center gap-0.5 py-1.5 px-1 rounded-xl transition-all duration-150 flex-1 touch-manipulation active:scale-90',
               isActive('/settings') ? 'text-[#ff0040]' : 'text-gray-500'
@@ -341,6 +384,7 @@ export function Layout({ children, noPadding }: LayoutProps) {
   const location = useLocation();
   const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
   const [showStatusDialog, setShowStatusDialog] = useState(false);
+  const [showCustomizeNav, setShowCustomizeNav] = useState(false);
   const { currentMessage, dismissCurrentMessage } = useSasquatchGuide();
   const { user } = useCurrentUser();
   const { totalBalance: cashuBalance, isInitialized: hasCashu } = useCashu();
@@ -349,6 +393,7 @@ export function Layout({ children, noPadding }: LayoutProps) {
   const author = useAuthor(user?.pubkey || '');
   const displayName = author.data?.metadata?.name ?? genUserName(user?.pubkey);
   const userAvatar = author.data?.metadata?.picture;
+  const { fixedMapTab, middleTabs } = useNavPreferences();
 
   const isActive = (path: string) => {
     // Both / and /map are the "spots" page
@@ -711,6 +756,18 @@ export function Layout({ children, noPadding }: LayoutProps) {
                       isActive={isActive('/settings')}
                       onClick={() => setMobileMenuOpen(false)}
                     />
+                    {/* Customize the bottom nav bar */}
+                    <button
+                      type="button"
+                      onClick={() => {
+                        setMobileMenuOpen(false);
+                        setShowCustomizeNav(true);
+                      }}
+                      className="flex items-center gap-3 px-4 py-3 rounded-xl transition-all duration-200 text-muted-foreground hover:bg-muted hover:text-foreground text-left"
+                    >
+                      <SlidersHorizontal className="h-5 w-5" />
+                      <span className="font-medium">Customize nav bar</span>
+                    </button>
                   </div>
                   {/* Language Toggle in Mobile Menu */}
                   <div className="py-3 border-t">
@@ -834,8 +891,14 @@ export function Layout({ children, noPadding }: LayoutProps) {
         userAvatar={userAvatar}
         userName={displayName}
         t={t}
+        onCustomize={() => setShowCustomizeNav(true)}
+        fixedMapTab={fixedMapTab}
+        middleTabs={middleTabs}
       />
 
+      {/* Bottom-nav customization sheet (mobile) */}
+      <CustomizeNavSheet open={showCustomizeNav} onOpenChange={setShowCustomizeNav} />
+
       {/* Sasquatch Guide (all screens) */}
       <SasquatchGuide 
         message={currentMessage}

src/hooks/useNavPreferences.ts

@@ -0,0 +1,132 @@
+import { useCallback, useMemo } from 'react';
+import {
+  MapPin,
+  GraduationCap,
+  Calendar,
+  Users,
+  Wallet,
+  Package,
+  Bookmark,
+  MessageCircle,
+  BarChart3,
+  type LucideIcon,
+} from 'lucide-react';
+import { useLocalStorage } from '@/hooks/useLocalStorage';
+
+/**
+ * Bottom-nav customization (mobile).
+ *
+ * Model: the bar always shows a FIXED Map (Shops & Spots) on the left and a
+ * FIXED Profile/Login slot on the right. The user customizes the **3 middle
+ * slots** from a curated catalog. Anything they don't pin stays reachable in the
+ * burger menu, so nothing is ever lost — just re-prioritized.
+ *
+ * Stored per-device in localStorage (v1). Could later sync across devices via a
+ * NIP-78 app-data event without changing this interface.
+ */
+
+export interface NavTab {
+  /** Stable id used in storage. */
+  id: string;
+  href: string;
+  /** Translation key when available, else falls back to `label`. */
+  labelKey?: string;
+  /** Plain label fallback / display name in the editor. */
+  label: string;
+  icon: LucideIcon;
+  /** Requires the user to be logged in to be useful. */
+  authOnly?: boolean;
+}
+
+/** The Map tab is fixed on the far left and never customizable. */
+export const FIXED_MAP_TAB: NavTab = {
+  id: 'map',
+  href: '/',
+  labelKey: 'nav.map',
+  label: 'Spots',
+  icon: MapPin,
+};
+
+/**
+ * Everything the user can pin to the 3 middle slots.
+ * (Map is excluded — it's the fixed anchor. Profile is the fixed right slot.)
+ */
+export const NAV_CATALOG: NavTab[] = [
+  { id: 'lab', href: '/lab', labelKey: 'nav.lab', label: 'The Lab', icon: GraduationCap },
+  { id: 'events', href: '/events', labelKey: 'nav.events', label: 'Events', icon: Calendar },
+  { id: 'crews', href: '/crews', labelKey: 'nav.crews', label: 'Crews', icon: Users },
+  { id: 'wallet', href: '/wallet', labelKey: 'nav.wallet', label: 'Wallet', icon: Wallet, authOnly: true },
+  { id: 'stash', href: '/stash', label: 'Stash', icon: Package, authOnly: true },
+  { id: 'collections', href: '/collections', label: 'Collections', icon: Bookmark, authOnly: true },
+  { id: 'contacts', href: '/contacts', label: 'Contacts', icon: Users, authOnly: true },
+  { id: 'messages', href: '/messages', label: 'Messages', icon: MessageCircle, authOnly: true },
+  { id: 'stats', href: '/stats', labelKey: 'nav.stats', label: 'Stats', icon: BarChart3 },
+];
+
+/** Number of user-customizable middle slots. */
+export const MIDDLE_SLOTS = 3;
+
+/** Default middle tabs (matches the app's original hardcoded bar). */
+export const DEFAULT_TAB_IDS = ['lab', 'events', 'crews'];
+
+const STORAGE_KEY = 'skatespots:nav-tabs:v1';
+
+function lookup(id: string): NavTab | undefined {
+  return NAV_CATALOG.find((t) => t.id === id);
+}
+
+/** Sanitize stored ids: keep known ids, dedupe, clamp to MIDDLE_SLOTS, backfill. */
+function normalizeIds(ids: string[]): string[] {
+  const seen = new Set<string>();
+  const clean: string[] = [];
+  for (const id of ids) {
+    if (lookup(id) && !seen.has(id)) {
+      seen.add(id);
+      clean.push(id);
+    }
+    if (clean.length >= MIDDLE_SLOTS) break;
+  }
+  // Backfill from defaults if the user somehow has fewer than the slot count.
+  for (const id of DEFAULT_TAB_IDS) {
+    if (clean.length >= MIDDLE_SLOTS) break;
+    if (!seen.has(id)) {
+      seen.add(id);
+      clean.push(id);
+    }
+  }
+  return clean.slice(0, MIDDLE_SLOTS);
+}
+
+export function useNavPreferences() {
+  const [storedIds, setStoredIds] = useLocalStorage<string[]>(STORAGE_KEY, DEFAULT_TAB_IDS);
+
+  const middleIds = useMemo(() => normalizeIds(storedIds), [storedIds]);
+
+  /** Resolve ids → NavTab objects (order preserved). */
+  const middleTabs = useMemo(
+    () => middleIds.map(lookup).filter((t): t is NavTab => !!t),
+    [middleIds],
+  );
+
+  const setMiddleIds = useCallback(
+    (ids: string[]) => setStoredIds(normalizeIds(ids)),
+    [setStoredIds],
+  );
+
+  const reset = useCallback(() => setStoredIds(DEFAULT_TAB_IDS), [setStoredIds]);
+
+  return {
+    /** The 3 chosen middle tab ids. */
+    middleIds,
+    /** The 3 chosen middle tabs resolved to objects. */
+    middleTabs,
+    /** Replace the whole selection (auto-normalized). */
+    setMiddleIds,
+    /** Restore defaults. */
+    reset,
+    /** Full catalog for the editor. */
+    catalog: NAV_CATALOG,
+    fixedMapTab: FIXED_MAP_TAB,
+    slots: MIDDLE_SLOTS,
+  };
+}