Fix save/resume after refresh + map basemap

Map (basemap was rendering black):
- Inline MapLibre style (dark-navy background + subtle OpenFreeMap ne2sr
  raster) instead of the remote "dark" style, whose vector tiles are empty at
  world zoom and gated the choropleth on a remote styledata fetch.
- Explicit prod worker URL (maplibre-gl-worker via ?url) so GeoJSON sources
  process in the production bundle.
- Hardened the choropleth against geo load-order races (empty sources up
  front, ownership stamped once data lands) and bumped fill opacity so the
  vivid per-nation colors are the star on the non-black background.

Save/resume (a refresh used to drop users to the home screen):
- Persist the active game id in localStorage (history.activeGameId) on create
  and resume; clear it when explicitly starting a new game.
- Auto-resume the last game on a page refresh (GET /api/games/:id + /map),
  re-attaching the SSE stream; fall back to home gracefully if it's gone.
- Home screen: prominent "Resume last game" button + a "Saved games" section
  (newest first). New GET /api/games list endpoint.

e2e: two new deterministic tests — auto-resume-on-reload and explicit resume
from the home screen (both under LLM_STUB=1).

Quality gates: typecheck, lint, 21 unit tests, 3 e2e tests — all pass.

src/lib/api.ts

@@ -2,7 +2,7 @@
 // proxied by Vite in dev and served by Express in prod), so no origin is ever
 // hardcoded — this works unchanged behind the Traefik proxy.
 import type { GameState, Preset, PresetMeta } from '@shared/types';
-import type { AdvisorResponse, CreateGameResponse, TurnResponse } from '@shared/protocol';
+import type { AdvisorResponse, CreateGameResponse, GameSummary, TurnResponse } from '@shared/protocol';
 
 async function req<T>(path: string, init?: RequestInit): Promise<T> {
   const res = await fetch(path, {
@@ -25,6 +25,9 @@ export const api = {
       body: JSON.stringify({ presetId, playerNationId }),
     }),
   getGame: (id: string) => req<{ game: GameState }>(`/api/games/${id}`),
+  // Every saved game as a lightweight summary, newest-updated first (for the
+  // home screen's "Saved games" section / resume affordances).
+  listGames: () => req<{ games: GameSummary[] }>('/api/games'),
   turn: (id: string, action?: string, chat?: { to: string; message: string }) =>
     req<TurnResponse>(`/api/games/${id}/turn`, {
       method: 'POST',