ui : move the settings exit route into ROUTES

SETTINGS_FALLBACK_EXIT_ROUTE is just a route, so it lives with the other
routes as ROUTES.SETTINGS_EXIT.

tools/ui/src/lib/constants/routes.constants.ts

@@ -21,6 +21,8 @@ export const ROUTES = {
 	SEARCH: '#/search',
 	/** Settings base — for dynamic settings URLs use RouterService. */
 	SETTINGS: '#/settings',
+	/** Exit destination for the settings view (fallback when no referrer). */
+	SETTINGS_EXIT: '#/',
 	/** Root — start of the app. */
 	START: '#/'
 } as const;

tools/ui/src/lib/constants/settings.constants.ts

@@ -717,9 +717,6 @@ export const SETTING_CONFIG_INFO: Record<string, string> = Object.fromEntries(
 	getAllSettings().map((s) => [s.key, s.help])
 ) as Record<string, string>;
 
-/** Exit destination for the settings view (fallback when no referrer). */
-export const SETTINGS_FALLBACK_EXIT_ROUTE = ROUTES.START;
-
 /** Sidebar sections + field configs (as consumed by UI). */
 function toSettingsSection(section: SettingsSectionEntry): SettingsSection {
 	return {

tools/ui/src/lib/stores/settings/referrer.svelte.ts

@@ -5,9 +5,9 @@
  * there after a fallback exit. Standalone reactive value, no host.
  */
 
-import { SETTINGS_FALLBACK_EXIT_ROUTE } from '$lib/constants';
+import { ROUTES } from '$lib/constants';
 
-let _url = $state<string>(SETTINGS_FALLBACK_EXIT_ROUTE);
+let _url = $state<string>(ROUTES.SETTINGS_EXIT);
 
 export const settingsReferrer = {
 	get url() {

tools/ui/src/routes/settings/+layout.svelte

@@ -4,7 +4,7 @@
 	import { goto } from '$app/navigation';
 	import { page } from '$app/state';
 	import { ActionIcon } from '$lib/components/app';
-	import { SETTINGS_FALLBACK_EXIT_ROUTE } from '$lib/constants';
+	import { ROUTES } from '$lib/constants';
 
 	let { children } = $props();
 
@@ -24,7 +24,7 @@
 		if (browser && window.history.length > 1 && !prevIsSettings) {
 			history.back();
 		} else {
-			goto(SETTINGS_FALLBACK_EXIT_ROUTE);
+			goto(ROUTES.SETTINGS_EXIT);
 		}
 	}
 </script>