feat(help): in-app help center with per-screen guides and pictures

A help icon on every screen opens a panel with the screen's overview, its
sub-screens, task guides with a framed picture per step, search across guides
and the wiki, and a switch to any other screen's help. Guides exist for the
dashboard, Vacay, Atlas, Collections, Journey (list, journal, studio), Settings
(all tabs), Admin (all tabs) and the trip frame; the trip's own screens are
in progress. Pictures are produced by Playwright (client/e2e/help), texts in
all 23 languages.

client/src/components/Help/helpIcons.ts

@@ -0,0 +1,89 @@
+import {
+  Plus, Pencil, Image, Copy, Archive, Trash2, SlidersHorizontal, CalendarPlus, LayoutDashboard, Coins, Clock, Compass,
+  CalendarCheck, CircleDot, Hourglass, Calculator, CalendarRange, Building2, Flag, GraduationCap, CalendarOff, CalendarDays,
+  Repeat, UserPlus, Share2, Globe, MapPin, Search, Star, Eye, LandPlot, BarChart3, MinusCircle, Landmark,
+  DownloadCloud, CheckCircle2, PanelRight, Tags, Upload, FileInput, Library, Bookmark, BookOpen, Sparkles, ThumbsUp, Images, Link,
+  Book, Palette, Map, Bell, Plug, CloudOff, User, Lock, ShieldCheck, Fingerprint, KeyRound,
+  Route, Users, UserRound, Crown, PanelLeftClose, Undo2, Ticket, Train, ListChecks, Wallet, FolderOpen, MessagesSquare,
+  type LucideIcon,
+} from 'lucide-react'
+import type { HelpIcon } from '../../help/types'
+
+/** The registry names icons; the components draw them. Unknown names fall back to the compass. */
+const ICONS: Record<HelpIcon, LucideIcon> = {
+  plus: Plus,
+  pencil: Pencil,
+  image: Image,
+  copy: Copy,
+  archive: Archive,
+  trash: Trash2,
+  filter: SlidersHorizontal,
+  calendar: CalendarPlus,
+  layout: LayoutDashboard,
+  coins: Coins,
+  clock: Clock,
+  compass: Compass,
+  calendarCheck: CalendarCheck,
+  halfDay: CircleDot,
+  hourglass: Hourglass,
+  calculator: Calculator,
+  calendarRange: CalendarRange,
+  building: Building2,
+  flag: Flag,
+  graduationCap: GraduationCap,
+  calendarOff: CalendarOff,
+  calendarDays: CalendarDays,
+  repeat: Repeat,
+  userPlus: UserPlus,
+  share: Share2,
+  globe: Globe,
+  mapPin: MapPin,
+  search: Search,
+  star: Star,
+  eye: Eye,
+  regions: LandPlot,
+  chart: BarChart3,
+  minusCircle: MinusCircle,
+  landmark: Landmark,
+  download: DownloadCloud,
+  checkCircle: CheckCircle2,
+  panelRight: PanelRight,
+  tags: Tags,
+  upload: Upload,
+  fileInput: FileInput,
+  library: Library,
+  bookmark: Bookmark,
+  bookOpen: BookOpen,
+  sparkles: Sparkles,
+  thumbsUp: ThumbsUp,
+  gallery: Images,
+  link: Link,
+  book: Book,
+  sliders: SlidersHorizontal,
+  palette: Palette,
+  map: Map,
+  bell: Bell,
+  plug: Plug,
+  cloudOff: CloudOff,
+  user: User,
+  lock: Lock,
+  shield: ShieldCheck,
+  fingerprint: Fingerprint,
+  key: KeyRound,
+  route: Route,
+  users: Users,
+  userRound: UserRound,
+  crown: Crown,
+  panelLeft: PanelLeftClose,
+  undo: Undo2,
+  ticket: Ticket,
+  train: Train,
+  listChecks: ListChecks,
+  wallet: Wallet,
+  folder: FolderOpen,
+  messages: MessagesSquare,
+}
+
+export function helpIcon(name: HelpIcon): LucideIcon {
+  return ICONS[name] ?? Compass
+}