Refactor/home page - #524
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Show the nearest-station name and observation time (Taipei wall clock) as small print under the home header name, and open the map on the temperature layer at that same station from a link shown when the sheet is expanded. Realtime readings are gated to the selected township so a stale previous-area observation never masquerades as the new one while its fetch runs; the debug GPS read rides alongside the data fetches so a fix inside its 10s timeout window can no longer hold up the sheet.
The realtime endpoint trims the trailing 0 from a station code (C0X16, not C0X160), so opening that station's map sheet failed — the directory and the trend endpoint both key by the 6-char form. Normalise the id on decode so every consumer addresses the same key space.
Basemap vector tiles now come from static.lb.exptech.dev (still served through the same three-tier tile cache), and the terrain tiles join the base map as a raster-dem source with a translucent hillshade layer between the land fills and the borders. The terrain PNGs are Mapbox.com terrain-RGB (height = num/10 - 10000), an encoding MapLibre Native can't read — both its terrarium and mapbox decoders would turn Taiwan into a -32 km pit. A small codec rewrites each tile to terrarium before MapLibre ever sees it: the Dio interceptor and MapTileCache convert on write, and MapTileCache fetches cache-missing terrain itself (a native download would keep the unconverted bytes). Also pins image (pure Dart PNG codec) as a direct dependency.
The terrain tiles are Mapbox.com terrain-RGB — height = (R·65536 + G·256 + B)/10 − 10000 — which is exactly what MapLibre's `encoding: 'mapbox'` decodes, so the whole app-side rewrite to terrarium was wrong (see satellite-tiles-go/web). The raster-dem source now declares encoding mapbox, tileSize 512, zoom 0–12, and bounds [110, 10, 132, 35] — deliberately overshooting the DEM bbox so the hillshade edge never meets the plain background on screen. Hillshade follows the reference tuning (illumination 335°, exaggeration 0.3). Deleted terrain_tile_codec.dart and the conversion paths in EtagInterceptor and MapTileCache; MapTileCache no longer needs a fetcher. image is back to transitive.
Adds a shared MapTerrainRow (relief checkbox) that slots into every overlay menu alongside the township-label row. MapTownLabelsMenu becomes MapBasemapMenu holding both toggles, and the chip turns active when either is on. MapScaffold owns the ValueNotifier and calls setLayerVisibility on the stable terrain-hillshade id — re-applied after style reloads so the preference survives them. MapLayer.buildTopTrailingChrome threads the toggle through each layer so the state lives in exactly one place.
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