ui: Constants refactor (#26908)

* refactor: Constants

* refactor: Constants/Enums cleanup

* refactor: Constant objects instead of multiple single value constants

* refactor: Cleanup constants

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

@@ -0,0 +1,38 @@
+/** Query params the chat routes read from the URL. */
+export const URL_PARAMS = {
+	/** Load the selected model instead of waiting for the first message. */
+	LOAD: 'load',
+	/** Model to select. */
+	MODEL: 'model',
+	/** Start a new chat. */
+	NEW_CHAT: 'new_chat',
+	/** Prompt to send on arrival. */
+	QUERY: 'q'
+} as const;
+
+/** Settings section slugs — used for routes and navigation. */
+export const SETTINGS_SECTION_SLUGS = {
+	AGENTIC: 'agentic',
+	DEVELOPER: 'developer',
+	DISPLAY: 'display',
+	GENERAL: 'general',
+	IMPORT_EXPORT: 'import-export',
+	PENALTIES: 'penalties',
+	SAMPLING: 'sampling',
+	TOOLS: 'tools'
+} as const;
+
+export const ROUTES = {
+	/** Chat base — for dynamic chat URLs use RouterService. */
+	CHAT: '#/chat',
+	/** MCP servers. */
+	MCP_SERVERS: '#/mcp-servers',
+	/** New chat — root with new chat query param. */
+	NEW_CHAT: `?${URL_PARAMS.NEW_CHAT}=true#/`,
+	/** Search — mobile-only full-page conversation search. */
+	SEARCH: '#/search',
+	/** Settings base — for dynamic settings URLs use RouterService. */
+	SETTINGS: '#/settings',
+	/** Root — start of the app. */
+	START: '#/'
+} as const;