fix(web): navigate to /issues when switching workspaces

When switching workspaces while on a detail page (e.g. /issues/[id]),
the store clears old data and the page tries to fetch the old resource
with the new workspace context, causing a 404 error. Navigate to the
issues list before switching to avoid referencing stale resources.

apps/web/app/(dashboard)/_components/app-sidebar.tsx

@@ -132,6 +132,7 @@ export function AppSidebar() {
                         key={ws.id}
                         onClick={() => {
                           if (ws.id !== workspace?.id) {
+                            router.push("/issues");
                             switchWorkspace(ws.id);
                           }
                         }}