🔃 refactor: Streamline Navigation, Message Loading UX (#7118)

* chore: fix logging for illegal target endpoints in getEndpointFromSetup

* fix: prevent querying agent by ID for ephemeral agents

* refactor: reorder variable declarations in MessagesView for clarity

* fix: localize 'nothing found' message in MessagesView

* refactor: streamline navigation logic and enhance loading spinner component in ChatView

* refactor: simplify loading spinner logic in ChatView component

* fix: ensure message queries are invalidated after new conversation creation in HeaderNewChat, MobileNav, and NewChat components

* 🐛 First run dev mode will have error occur.

🐛 First run dev mode will have error occur.

* fix font-size localstorage presist bug

* Don't ping meilisearch if the search is disabled via env var

* simplify logic in search/enable endpoint

* refactor: simplify enable endpoint condition check

* feat: add useIdChangeEffect hook and integrate it into ChatRoute

---------

Co-authored-by: Ne0 <20765145+zeeklog@users.noreply.github.com>
Co-authored-by: TinyTin <garychangcn@hotmail.com>
Co-authored-by: Denis Palnitsky <denis.palnitsky@zendesk.com>

client/src/hooks/Agents/useSelectAgent.ts

@@ -18,7 +18,7 @@ export default function useSelectAgent() {
   );
 
   const agentQuery = useGetAgentByIdQuery(selectedAgentId ?? '', {
-    enabled: !!(selectedAgentId ?? ''),
+    enabled: !!(selectedAgentId ?? '') && selectedAgentId !== Constants.EPHEMERAL_AGENT_ID,
   });
 
   const updateConversation = useCallback(