refactor: go to /sessions/<sessionId> route on session click

src/App.tsx

@@ -66,7 +66,7 @@ function WorkspaceTabRoute() {
     tab: string;
   }>();
 
-  if (!workspaceId) {
+  if (!workspaceId && !sessionId) {
     return <Navigate to="/" replace />;
   }
 
@@ -74,7 +74,7 @@ function WorkspaceTabRoute() {
     return <Navigate to="../chat" replace />;
   }
 
-  const decodedWorkspaceId = decodeURIComponent(workspaceId);
+  const decodedWorkspaceId = workspaceId ? decodeURIComponent(workspaceId) : null;
   const decodedSessionId = sessionId ? decodeURIComponent(sessionId) : null;
   const decodedTab = tab ? decodeURIComponent(tab) : 'chat';
 
@@ -83,7 +83,10 @@ function WorkspaceTabRoute() {
       <div className="rounded-xl border border-border/70 bg-card/30 p-5">
         <h2 className="text-lg font-semibold">{decodedTab} view</h2>
         <p className="mt-2 text-sm text-muted-foreground">
-          Workspace: <span className="font-medium text-foreground">{decodedWorkspaceId}</span>
+          Workspace:{' '}
+          <span className="font-medium text-foreground">
+            {decodedWorkspaceId || 'none (session-level route)'}
+          </span>
         </p>
         <p className="mt-1 text-sm text-muted-foreground">
           Session:{' '}
@@ -102,20 +105,20 @@ const router = createBrowserRouter(
       path: '/',
       element: <RootLayout />,
       children: [
-        { index: true, element: <NoWorkspaceRoute /> },
+        { index: true, element: <NoWorkspaceRoute /> }, // TODO: Show empty state component loader here.
         {
           path: 'workspaces/:workspaceId',
           element: <WorkspaceLayout />,
           children: [
             { index: true, element: <Navigate to="chat" replace /> },
             { path: ':tab', element: <WorkspaceTabRoute /> },
-            {
-              path: 'sessions/:sessionId',
-              children: [
-                { index: true, element: <Navigate to="chat" replace /> },
-                { path: ':tab', element: <WorkspaceTabRoute /> },
-              ],
-            },
+          ],
+        },
+        {
+          path: 'sessions/:sessionId',
+          children: [
+            { index: true, element: <Navigate to="chat" replace /> },
+            { path: ':tab', element: <WorkspaceTabRoute /> },
           ],
         },
       ],

src/components/refactored/shared/layout/MainHeading.tsx

@@ -111,22 +111,20 @@ export function MainHeading() {
     return () => observer.disconnect();
   }, [isMobile, updateScrollState]);
 
-  if (!workspaceId) {
+  if (!workspaceId && !sessionId) {
     return null;
   }
 
   const handleTabSelect = (nextTab: AppTab) => {
-    // Preserve workspace/session context while switching only the active tab path segment.
-    const encodedWorkspaceId = encodeURIComponent(decodedWorkspaceId);
+    // Preserve route context while switching only the active tab path segment.
     const encodedTab = encodeURIComponent(nextTab);
 
     if (decodedSessionId) {
-      navigate(
-        `/workspaces/${encodedWorkspaceId}/sessions/${encodeURIComponent(decodedSessionId)}/${encodedTab}`,
-      );
+      navigate(`/sessions/${encodeURIComponent(decodedSessionId)}/${encodedTab}`);
       return;
     }
 
+    const encodedWorkspaceId = encodeURIComponent(decodedWorkspaceId);
     navigate(`/workspaces/${encodedWorkspaceId}/${encodedTab}`);
   };
 
@@ -158,7 +156,7 @@ export function MainHeading() {
                 {title}
               </h2>
               <div className="truncate text-[11px] leading-tight text-muted-foreground">
-                {decodedWorkspaceId}
+                {decodedWorkspaceId || t('mainContent.newSession')}
               </div>
             </div>
           </div>

src/components/refactored/shared/layout/MobileNav.tsx

@@ -89,21 +89,19 @@ export function MobileNav() {
   }, [moreOpen]);
 
   const navigateToTab = (nextTab: AppTab) => {
-    if (!workspaceId) {
+    if (!workspaceId && !sessionId) {
       return;
     }
 
-    const encodedWorkspaceId = encodeURIComponent(decodeValue(workspaceId));
     const encodedTab = encodeURIComponent(nextTab);
     const decodedSessionId = decodeValue(sessionId);
 
     if (decodedSessionId) {
-      navigate(
-        `/workspaces/${encodedWorkspaceId}/sessions/${encodeURIComponent(decodedSessionId)}/${encodedTab}`,
-      );
+      navigate(`/sessions/${encodeURIComponent(decodedSessionId)}/${encodedTab}`);
       return;
     }
 
+    const encodedWorkspaceId = encodeURIComponent(decodeValue(workspaceId));
     navigate(`/workspaces/${encodedWorkspaceId}/${encodedTab}`);
   };
 

src/components/refactored/sidebar/hooks/useWorkspaces.ts

@@ -23,7 +23,7 @@ import {
   splitWorkspacesByStarred,
 } from '@/components/refactored/sidebar/utils/workspaceTransforms';
 
-const SESSION_ROUTE_PATTERN = /^\/workspaces\/[^/]+\/sessions\/([^/]+)(?:\/[^/]+)?$/;
+const SESSION_ROUTE_PATTERN = /^\/sessions\/([^/]+)(?:\/[^/]+)?$/;
 
 const extractSessionIdFromPathname = (pathname: string): string | null => {
   const sessionMatch = pathname.match(SESSION_ROUTE_PATTERN);
@@ -120,7 +120,7 @@ export const useWorkspaces = () => {
       }
 
       navigate(
-        `/workspaces/${encodeURIComponent(matchedWorkspace.workspaceId)}/sessions/${encodeURIComponent(sessionId)}`,
+        `/sessions/${encodeURIComponent(sessionId)}`,
       );
     },
     [navigate, workspaces],