feat: v0.4.0 — self-host OFM styles/fonts/sprites (tiles stay remote) + top-bar style switcher defaulting to Fiord

CHANGELOG.md

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 # Changelog
 
+## v0.4.0 — 2026-09-17 08:22
+- Self-hosted all OpenFreeMap map-styling assets (tiles stay remote): new `scripts/download-map-assets.mjs` fetches the 5 OFM styles with a browser UA, rewrites each via `rewriteStyle`, and extracts the font/sprite tarballs into `public/` — committed so the image is self-contained: `public/styles/{liberty,bright,positron,dark,fiord}.json` (0.15 MB), `public/fonts/Noto Sans {Regular,Italic,Bold}/*.pbf` (768 files, 99.76 MB — the font payload), `public/sprites/ofm{.json,.png,@2x.json,@2x.png}` (0.21 MB); total public/ = 100.13 MB
+- New shared module `lib/mapStyles.ts`: `STYLES` registry (5 ids + labels), `DEFAULT_STYLE_ID = 'fiord'`, and pure `rewriteStyle()` — glyphs `https://tiles.openfreemap.org/fonts/{fontstack}/{range}.pbf` → `/fonts/{fontstack}/{range}.pbf`, sprite `https://tiles.openfreemap.org/sprites/ofm_f384/ofm` → `/sprites/ofm`; the vector tile url (`/planet`) and ne2_shaded raster tiles (`/natural_earth/ne2sr/...`) are left remote; every source lacking an attribution gets `"© OpenStreetMap contributors © OpenFreeMap"` (OFM styles ship none; ODbL requires visible OSM credit)
+- `components/Map.tsx`: map now loads the local `/styles/fiord.json` by default; new top-bar style switcher (`<select data-testid="style-switch">`, subtle styling in `app/globals.css`) listing all 5 styles, persisted to localStorage key `flight-ops-style`; SSR-safe — state initializes to `DEFAULT_STYLE_ID` and the saved choice is read/applied only in a post-mount effect (no localStorage reads during render/hydration)
+- `components/Map.tsx`: airports layer now survives style switches — `/api/airports` is fetched at most once per page life (promise cached in a ref; count set exactly once), and an idempotent `ensureAirportsLayer()` re-adds the source+layer if missing on EVERY `styledata` event (initial load AND after each `setStyle`, which wipes sources/layers not in the new style); the click→popup handler is re-wired with off+on using a stable reference since MapLibre layer-scoped listeners survive setStyle and would otherwise duplicate
+- `Dockerfile`: runtime stage now copies `public/` from the build stage (`COPY --from=build /app/public ./public`) so `next start` serves the self-hosted assets; `.dockerignore` already lets public/ through
+- Tests: new unit suite `lib/mapStyles.test.ts` (registry shape, fiord default, rewriteStyle against an inline OFM fixture — local glyphs/sprite, remote tiles preserved, attribution added/preserved, input not mutated); `e2e/map.spec.ts`: openfreemap mock simplified to abort ALL requests from that host (only tiles remain there), new test asserting the switcher has 5 options with Fiord default, switching changes the applied style's layer set AND the airports layer re-renders after the switch + exactly one popup on marker click (guards the setStyle-wipes-layers and duplicate-listener regressions), plus a reload-persistence test for the localStorage restore path
+- Verified: unit suite 16/16; `tsc --noEmit` clean; e2e suite 6/6 green against the rebuilt compose instance (all styles/fonts/sprites served locally, fiord default, switch + persistence verified in a real browser)
+
 ## v0.3.1 — 2026-09-17 06:35
 - Header now shows the app version between the "Flight Ops" title and the airport count (`<small>v{version}</small>` in `components/Map.tsx`), sourced dynamically from `package.json` via a JSON import — future version bumps show up automatically with no code change; subtle 11px muted style added to `app/globals.css`
 - Tests: new unit suite `components/version.test.ts` (valid semver in package.json + guard that the header sources the version from package.json rather than hardcoding it); `e2e/map.spec.ts`: new test asserting the header shows `v{version}` with the expected value read from `package.json` at test time, so it stays in sync automatically