planner: add the Weather data layer (temperature, rain, night lows)

[timohueser]

Summary

This adds the Weather data layer to the website planner. It follows the owner decisions on #2329 (layers Snow / Weather / Wind, one on the map at a time).

• Registry: one line in layers/registry.ts on the climate archive. The layer requests nothing while it is off.
• Map: a switch in the date bar selects Temperature or Rain.
  • Temperature shows the daytime highs of the week. Each pixel blends the four nearest cells. Each cell temperature moves to the pixel height with the lapse rate of that cell and month. The heights come from the DEM tiles that the relief loads.
  • Rain shows the ten-year wet-day share as days of 7 on a smooth scale.
  • Tiles decode once. A change of date or variable only paints the tiles again.
• Year slider: three rows, High, Low and Rain, with the one-line label above them ("On the route, 14–20 May: highs 12–18 °C · lows 4–9 °C · rain on 3.2 of 7 days").
• Night lows: a label at each overnight stop (trip day end), for example "Night 5–9 °C". The range is the weekly lows over the years without the lowest and the highest year, at the stop height. The night after day n is the layer date plus n − 1 days.
• Profile strip: daytime high only. Rain has no strip.
• Point chart (map callout and strip popover) follows the map variable:
  • Temperature: year × week rows for highs and lows, and the note "Valleys can be colder on clear nights".
  • Rain: a 52-week line of the mean wet days of 7, a band for most years (without the lowest and the highest year) and the layer week marked. The headline is, for example, "14–20 May: rain on about 3 of 7 days (1–5 in most years)". A short note says when the week usually has more or less rain than an average week of the cell.
  • "~9 km grid" is in the source line.

Changes to shared code

• DataLayer gets one optional method, nights(samples, stops), and an optional strip.label. PlannerApp gives the trip day ends as stops. PlannerMap draws the labels as panel pills beside the day-end pins.
• climate-source.ts: openClimate(url) keeps one source per archive URL, so Weather and Wind share the decoded tiles. It is the same function as in the Wind PR planner: add the Wind data layer #2349.
• A map point reads its height from the most detailed decoded DEM tile, or else from the DEM tile of the view zoom. In Rain mode no tile is decoded yet, and the browser cache answers that fetch. A route keeps its profile heights.
• climate-terrain.ts: tileHeights becomes demPixels plus pixelHeight. The layer caches decoded DEM tiles per DEM tile, so four map tiles share one fetch and one decode.
• addDays in data-layer.ts, used by the date bar and the night dates.
• LayerInspect: compact charts with more than one grid use 3 px rows.
• RainWeeks.svelte: the rain chart, given to the point chart as Chart.extra.
• pretest:planner gets VITE_PLANNER_CLIMATE_URL, so the journey builds with the layer in the menu. The budget is unchanged.

Verification (BW archive, local preview)

• 2-day loop Freiburg – St. Märgen – Titisee – Notschrei – Freiburg (101.5 km), checked in May and January, light and dark: switch, map colours, slider rows, night label, strip, point chart, map callout, legend in the layer menu. No runtime console errors.

• Requests while the layer is off: no climate request. Turning the layer on: 4 range requests on climate.pmtiles (header, directory, overview and detail data). The 6 terrain fetches are the same DEM URLs that the relief loaded. The tile Worker sends immutable caching for them, so the browser cache answers them. The local pmtiles server sends no cache header, so the browser revalidates them locally (304).

• Paint time: 15 map tiles, mean 3 ms, longest 6 ms per 256 px tile.

• Dark mode: the temperature stops from 0 to 30 °C are lighter, so May and January stay readable on the dark land colour.

Checks run

• npx vitest run src/lib/planner src/components/planner: 30 files, 192 tests pass. The new weather.test.ts covers colour mapping, pixel blending and terrain correction, the year rows and label, the rain weeks and both charts, and the night labels.
• svelte-check: no new findings. The 15 remaining errors are the missing wasm pkg/ builds in untouched files.
• npm run test:planner: passes. The totals are unchanged from the budget (cloudflare=104).
• obc suites check, obc prose --check: OK.
• Not run: the full web suite and the other browser suites. CI runs them.

Public docs changed: no
Requirements: none

🤖 Generated with Claude Code

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