refactor(orbit,playback): move feature-owned stores (helpModal→orbit; libraryPlaybackHint+playerBarLayout→playback)

src/features/orbit/components/OrbitHelpModal.tsx

@@ -5,7 +5,7 @@ import {
   ListMusic, Inbox, Sliders, LogOut,
 } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
-import { useHelpModalStore } from '@/store/helpModalStore';
+import { useHelpModalStore } from '@/features/orbit/store/helpModalStore';
 import { SettingsSubSection } from '@/features/settings';
 
 /**

src/features/orbit/components/OrbitSessionBar.tsx

@@ -4,7 +4,7 @@ import { useEffect, useRef, useState } from 'react';
 import { X, RefreshCw, Shuffle, Settings2, Share2, HelpCircle, Activity } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
 import { useOrbitStore } from '@/features/orbit/store/orbitStore';
-import { useHelpModalStore } from '@/store/helpModalStore';
+import { useHelpModalStore } from '@/features/orbit/store/helpModalStore';
 import { usePlayerStore } from '@/features/playback/store/playerStore';
 import {
   endOrbitSession,

src/features/orbit/components/OrbitStartTrigger.tsx

@@ -4,7 +4,7 @@ import { Orbit as OrbitIcon, Plus, LogIn, HelpCircle } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
 import { useOrbitStore } from '@/features/orbit/store/orbitStore';
 import { useAuthStore } from '@/store/authStore';
-import { useHelpModalStore } from '@/store/helpModalStore';
+import { useHelpModalStore } from '@/features/orbit/store/helpModalStore';
 import OrbitStartModal from '@/features/orbit/components/OrbitStartModal';
 import OrbitJoinModal from '@/features/orbit/components/OrbitJoinModal';
 import OrbitWordmark from '@/features/orbit/components/OrbitWordmark';

src/features/orbit/store/helpModalStore.ts

@@ -0,0 +1,19 @@
+import { create } from 'zustand';
+
+interface HelpModalStore {
+  isOpen: boolean;
+  open: () => void;
+  close: () => void;
+}
+
+/**
+ * App-wide toggle for the Orbit help modal. Two triggers — the launch
+ * popover "How does this work?" entry and the in-session bar help button
+ * — write to the same store so they share the one rendered modal. Not
+ * persisted; resets to closed on reload.
+ */
+export const useHelpModalStore = create<HelpModalStore>(set => ({
+  isOpen: false,
+  open: () => set({ isOpen: true }),
+  close: () => set({ isOpen: false }),
+}));