feat: describe what the app shows as a view

A view is a camera, data layers, visual style, map imagery and an aircraft,
military aircraft or satellite to follow, written in the share-link format
the app already restores. gods-eye-view/view builds, encodes and decodes one,
and share links take their style names from it. open_in_gods_eye_view now
builds its link from a full view: an area or camera, layers, style, map and
something to follow.

src/sharelink.js

@@ -9,6 +9,7 @@ import {
   decodeLayerStateParams,
   encodeLayerStateParams,
 } from './data/layerState.js';
+import { STYLE_URL_NAMES } from './view/index.js';
 
 /**
  * Share Links — URL Hash State Management
@@ -20,16 +21,8 @@ import {
 const DEBOUNCE_MS = 500;
 const LEGACY_BLOOM_FALLBACK = 50;
 
-// Style name mapping: internal → URL-friendly
-const STYLE_TO_URL = {
-  normal: 'normal',
-  retro: 'crt',
-  surveillance: 'nvg',
-  thermal: 'flir',
-  anime: 'anime',
-  noir: 'noir',
-  snow: 'snow',
-};
+// Style name mapping: internal → URL-friendly, shared with views.
+const STYLE_TO_URL = STYLE_URL_NAMES;
 
 const SHARE_UI_STATE_PARAM = 'ui';
 const SHARE_STYLE_PARAMS_PARAM = 'sp';