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+# Phase 5 — Popular Requests MASTER Plan
+
+> **This document is a plan INDEX, not an executable plan.** It lists the Phase 5 sub-plans, their dependency order, the contracts each sub-plan exports for downstream sub-plans to consume, and the shared files that cross sub-plan boundaries.
+
+**Goal of Phase 5:** Port the Popular Requests feature from Angular to React, wire it into existing route pages, implement the `useSearchHistory` hook backed by `@/shared/storage`, and verify SEO + parity. Popular Requests is an embedded component (not a standalone routed page) — used inside the OnlineBoard and Schedule start pages. It also includes the language switcher (ported from Angular layout) and a per-language-namespaced search history hook.
+
+**Phase 5 exit gate** (must pass before next phase starts):
+
+- `PopularRequestsPanel` renders correctly with all 5 request modes: `FlightNumber`, `Route`, `Arrival`, `Departure`, `RouteWithBack`.
+- `usePopularRequests` hook calls `GET /Requests/1/getpopular` and handles loading/error states.
+- `useSearchHistory` hook persists search history via `@/shared/storage` with per-language namespacing (`afl_history_{lang}`).
+- No direct `localStorage` access outside `src/shared/storage.ts` (enforced by ESLint `no-restricted-globals`).
+- MF expose `PopularRequests.tsx` upgraded from stub to real component.
+- Feature barrel `src/features/popular-requests/index.ts` exports all public surface.
+- `pnpm typecheck && pnpm lint && pnpm test && pnpm build:standalone` all green.
+
+**Angular source analyzed:**
+
+- **API:** `GET /api/Requests/1/getpopular` returns `IPopularRequest[]` (union of 4 discriminated types keyed by `RequestMode`).
+- **Types:** `RequestMode` enum: `FlightNumber | Route | RouteWithBack | Departure | Arrival`. `IPopularRequestType`: `'Schedule' | 'Onlineboard'`. `IPopularRequest` = union of `IPopularRouteRequest | IPopularArrivalRequest | IPopularDepartureRequest | IPopularFlightNumberRequest`.
+- **Components:** `PopularRequestsComponent` (container, fetches data, handles clicks + navigation), `PopularRequestComponent` (switch by mode), `ArrivalRequestComponent`, `DepartureRequestComponent`, `FlightNumberRequestComponent`, `RouteRequestComponent`, `RequestInfoComponent` (styled clickable span).
+- **Behavior:** On click, populates filter state in `OnlineBoardFiltersStateService` / `ScheduleFiltersStateService` and navigates to `onlineboard` or `schedule` route. Uses `cityName` pipe (maps IATA code to city name via dictionaries).
+- **Search History:** `SearchHistoryService` — in-memory array of `ISearchHistoryItem` with dedup-by-URL and prepend logic. Displayed on start pages. React version should persist to localStorage via `@/shared/storage`.
+- **No dedicated route** — embedded inside `OnlineBoardStartPage` and `ScheduleStartPage`.
+
+---
+
+## Sub-plan inventory
+
+| ID | Sub-plan | Estimated size | Description |
+|---|---|---|---|
+| **5A** | Types + API + hooks | Small (8-12 tasks) | `PopularRequest` types, `getPopularRequests` API fn, `usePopularRequests` hook |
+| **5B** | Route page + components | Medium (12-18 tasks) | `PopularRequestsPanel`, mode-specific sub-components, MF expose update |
+| **5C** | SEO + parity + integration tests | Small (6-10 tasks) | Verify no SEO regression, integration tests for the panel |
+| **5D** | Search history hook | Small (8-12 tasks) | `useSearchHistory` with per-language localStorage namespacing via `@/shared/storage` |
+
+---
+
+## Dependency graph
+
+```
+    ┌──────────────────────────────┐
+    │  5A  Types + API + hooks     │
+    │  src/features/popular-       │
+    │  requests/{types,api,hooks}  │
+    └──────────────┬───────────────┘
+                   │
+    ┌──────────────▼───────────────┐
+    │  5B  Components + MF expose  │◄── depends on 5A types/hooks
+    │  src/features/popular-       │
+    │  requests/components/        │
+    │  src/mf/expose/              │
+    └──────────────┬───────────────┘
+                   │
+    ┌──────────────▼───────────────┐
+    │  5C  SEO + parity + tests    │◄── depends on 5B components
+    └──────────────────────────────┘
+
+    ┌──────────────────────────────┐
+    │  5D  useSearchHistory hook   │  (independent of 5A-5C)
+    │  src/shared/hooks/           │
+    └──────────────────────────────┘
+```
+
+5D is independent and can be executed in parallel with 5A-5C.
+
+---
+
+## Contracts exported per sub-plan
+
+### 5A — Types + API + hooks
+
+**Files created:**
+- `src/features/popular-requests/types.ts` — `RequestMode`, `PopularRequestType`, `PopularRequest` union, sub-types
+- `src/features/popular-requests/api.ts` — `getPopularRequests(client: ApiClient): Promise<PopularRequest[]>`
+- `src/features/popular-requests/api.test.ts` — API function tests
+- `src/features/popular-requests/hooks/usePopularRequests.ts` — React hook wrapping the API call
+- `src/features/popular-requests/index.ts` — barrel update
+
+**Consumed by:** 5B (types + hook), 5C (tests)
+
+### 5B — Components + MF expose
+
+**Files created:**
+- `src/features/popular-requests/components/PopularRequestsPanel.tsx` — container component
+- `src/features/popular-requests/components/PopularRequestItem.tsx` — mode-switching renderer
+- `src/features/popular-requests/components/RequestInfo.tsx` — styled clickable span
+
+**Files modified:**
+- `src/mf/expose/PopularRequests.tsx` — stub replaced with real component
+- `src/features/popular-requests/index.ts` — barrel update
+
+**Consumed by:** 5C (integration tests), route pages (OnlineBoardStartPage, ScheduleStartPage)
+
+### 5C — SEO + parity + integration tests
+
+**Files created:**
+- `src/features/popular-requests/components/PopularRequestsPanel.test.tsx` — component tests
+
+**Consumed by:** Exit gate verification
+
+### 5D — Search history hook
+
+**Files created:**
+- `src/shared/hooks/useSearchHistory.ts` — hook with per-language localStorage namespacing
+- `src/shared/hooks/useSearchHistory.test.ts` — hook tests
+
+**Files modified:**
+- `src/features/popular-requests/index.ts` — re-export if appropriate
+
+**Consumed by:** Start pages (OnlineBoardStartPage, ScheduleStartPage) in future integration