fix: keep page state when switching tabs within the same route (#5796)

AnimatedOutlet keyed its motion container by the full pathname, so
navigating between params of the same route (e.g. the dashboard tabs
under /dashboard/$section) changed the key and remounted the route
component, discarding its in-memory state. The most visible symptom:
the dashboard time range resets to the default every time you switch
sub-tabs (Model Analytics / Flow / User Analytics).

Key the transition by the matched route id instead, so param-only
navigation re-renders in place while real page-to-page navigation
still plays the enter animation. This also preserves state across the
other $section tab pages (usage logs, models, system settings).

web/default/src/components/page-transition.tsx

@@ -57,8 +57,12 @@ export function PageTransition(props: PageTransitionProps) {
 
 export function AnimatedOutlet() {
   const shouldReduce = useReducedMotion()
+  // Key the page transition by the matched route id, not the resolved pathname.
+  // Navigating between params of the same route (e.g. dashboard tabs served by
+  // /dashboard/$section) then re-renders in place instead of remounting the
+  // route component and discarding its state (such as the selected time range).
   const routeKey = useRouterState({
-    select: (s) => s.location.pathname,
+    select: (s) => s.matches.at(-1)?.routeId ?? s.location.pathname,
   })
 
   if (shouldReduce) {