feat(#73): Adaptive Weekend shell and responsive navigation

Implemented by claude via .agents/dev dispatch.

frontend/src/types.ts

@@ -448,6 +448,120 @@ export interface DriverSummary {
   rounds: DriverSummaryRound[]
 }
 
+// ── Weekend Context ──
+// Canonical contract for the adaptive Weekend home. Served by
+// /api/v1/weekend-context (sibling backend story #72) and, until that endpoint
+// ships, derived client-side from existing endpoints (see lib/weekendContext.ts).
+export type WeekendState =
+  | 'loading'
+  | 'error'
+  | 'limited_data'
+  | 'between_races'
+  | 'pre_session'
+  | 'between_sessions'
+  | 'session_live'
+  | 'session_settling'
+  | 'post_weekend'
+  | 'season_complete'
+
+export interface WeekendPodiumEntry {
+  position: number
+  driver_number: number
+  name_acronym: string
+  team_name: string
+  team_colour: string
+  gap: string
+}
+
+export type WeekendSessionStatus = 'done' | 'live' | 'next' | 'upcoming'
+
+export interface WeekendTimelineSession {
+  session_key: number
+  session_name: string
+  session_type: string
+  date_start: string
+  date_end: string
+  status: WeekendSessionStatus
+}
+
+export interface WeekendCompletedEvent {
+  meeting_key: number
+  meeting_name: string
+  country_code: string
+  country_flag: string
+  circuit_short_name: string
+  round?: number
+  analysis_session_key: number
+  analysis_session_name: string
+  label: string
+  podium: WeekendPodiumEntry[]
+  story?: string
+}
+
+export interface WeekendUpcomingEvent {
+  meeting_key: number
+  meeting_name: string
+  country_code: string
+  country_flag: string
+  circuit_short_name: string
+  circuit_key?: number
+  round?: number
+  date_start?: string
+  next_session_name?: string
+  next_session_start?: string
+}
+
+export interface WeekendChampionshipMover {
+  position: number
+  driver_number: number
+  name_acronym: string
+  team_colour: string
+  points: number
+  delta?: number
+}
+
+export interface WeekendChampionshipImpact {
+  leaders: WeekendChampionshipMover[]
+  note?: string
+}
+
+export interface WeekendBriefingItem {
+  category?: string
+  title: string
+  url: string
+  source: string
+  published_at?: string
+  image_url?: string
+}
+
+export type WeekendRoundStatus = 'completed' | 'next' | 'upcoming'
+
+export interface WeekendSeasonRound {
+  round: number
+  meeting_key: number
+  country_code: string
+  country_flag: string
+  status: WeekendRoundStatus
+  analysis_session_key?: number
+}
+
+export interface WeekendContext {
+  state: WeekendState
+  season: number
+  message?: string
+  live?: boolean
+  active_meeting_name?: string
+  active_circuit_short_name?: string
+  last_event?: WeekendCompletedEvent
+  next_event?: WeekendUpcomingEvent
+  last_session?: WeekendCompletedEvent
+  next_session?: WeekendTimelineSession
+  sessions?: WeekendTimelineSession[]
+  championship_impact?: WeekendChampionshipImpact
+  season_rounds?: WeekendSeasonRound[]
+  briefing?: WeekendBriefingItem[]
+}
+
 export interface NewsItem {
   source: string
   title: string