Extract @trails-cool/map-core package from Planner

New renderer-agnostic package with zero dependencies:
- Tile configs (base layers, overlay layers)
- Color palettes (surface, highway, smoothness, tracktype, cycleway,
  bikeroute, elevation, maxspeed) — 8 color maps + 3 color functions
- POI category definitions (9 categories with Overpass queries, icons,
  colors, profile mappings)
- Z-index layering constants
- Snap distance constant

Updated 15 consuming files to import from @trails-cool/map-core.
Deleted poi-categories.ts and z-index.ts from the Planner (fully moved).
packages/map re-exports tile configs from map-core for backwards compat.

All 117 tests pass, no user-facing changes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/map/src/index.ts

@@ -2,5 +2,5 @@ export { MapView } from "./MapView.tsx";
 export type { MapViewProps } from "./MapView.tsx";
 export { RouteLayer } from "./RouteLayer.tsx";
 export type { RouteLayerProps } from "./RouteLayer.tsx";
-export { baseLayers, overlayLayers } from "./layers.ts";
-export type { TileLayerConfig, OverlayLayerConfig } from "./layers.ts";
+export { baseLayers, overlayLayers } from "@trails-cool/map-core";
+export type { TileLayerConfig, OverlayLayerConfig } from "@trails-cool/map-core";

packages/map/src/layers.ts

@@ -1,66 +1,2 @@
-export interface TileLayerConfig {
-  name: string;
-  url: string;
-  attribution: string;
-  maxZoom?: number;
-}
-
-export interface OverlayLayerConfig extends TileLayerConfig {
-  id: string;
-  opacity?: number;
-}
-
-export const overlayLayers: OverlayLayerConfig[] = [
-  {
-    id: "hillshading",
-    name: "Hillshading",
-    url: "https://tiles.wmflabs.org/hillshading/{z}/{x}/{y}.png",
-    attribution: "Hillshading: SRTM/Mapzen",
-    maxZoom: 17,
-    opacity: 0.5,
-  },
-  {
-    id: "waymarked-cycling",
-    name: "Cycling Routes",
-    url: "https://tile.waymarkedtrails.org/cycling/{z}/{x}/{y}.png",
-    attribution: '&copy; <a href="https://waymarkedtrails.org">Waymarked Trails</a> (CC-BY-SA)',
-    maxZoom: 18,
-  },
-  {
-    id: "waymarked-hiking",
-    name: "Hiking Routes",
-    url: "https://tile.waymarkedtrails.org/hiking/{z}/{x}/{y}.png",
-    attribution: '&copy; <a href="https://waymarkedtrails.org">Waymarked Trails</a> (CC-BY-SA)',
-    maxZoom: 18,
-  },
-  {
-    id: "waymarked-mtb",
-    name: "MTB Routes",
-    url: "https://tile.waymarkedtrails.org/mtb/{z}/{x}/{y}.png",
-    attribution: '&copy; <a href="https://waymarkedtrails.org">Waymarked Trails</a> (CC-BY-SA)',
-    maxZoom: 18,
-  },
-];
-
-export const baseLayers: TileLayerConfig[] = [
-  {
-    name: "OpenStreetMap",
-    url: "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
-    attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>',
-    maxZoom: 19,
-  },
-  {
-    name: "OpenTopoMap",
-    url: "https://{s}.tile.opentopomap.org/{z}/{x}/{y}.png",
-    attribution:
-      '&copy; <a href="https://opentopomap.org">OpenTopoMap</a> (<a href="https://creativecommons.org/licenses/by-sa/3.0/">CC-BY-SA</a>)',
-    maxZoom: 17,
-  },
-  {
-    name: "CyclOSM",
-    url: "https://{s}.tile-cyclosm.openstreetmap.fr/cyclosm/{z}/{x}/{y}.png",
-    attribution:
-      '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> &copy; <a href="https://github.com/cyclosm/cyclosm-cartocss-style/releases">CyclOSM</a>',
-    maxZoom: 20,
-  },
-];
+export type { TileLayerConfig, OverlayLayerConfig } from "@trails-cool/map-core";
+export { baseLayers, overlayLayers } from "@trails-cool/map-core";