feat(web): vehicle detail polish — analytics, chatwoot cleanup, skeleton, heading

- Capture category_view_changed and catalog_search_opened so the funnel
  picks up category-view and cross-tree search activation (previously
  uninstrumented).
- Expose clearChatwootVehicle() and call it from the route's effect
  cleanup so a later support chat doesn't carry the previously-viewed
  car's VIN/brand.
- Match the loading skeleton shape to the active viewMode — render a
  card grid for grid mode (was always 8 row-bars).
- Switch the vehicle title to the display font (font-display, tracking-tight)
  for typography parity with the rest of the app.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/routes/dashboard/vehicles_/$id/index.tsx

@@ -6,8 +6,9 @@ import { CategoryTree } from "@/components/categories/category-tree";
 import { CategoryViewToggle } from "@/components/categories/category-view-toggle";
 import { CarBrandLogo } from "@/components/ui/car-brand-logo";
 import { ApiError, api } from "@/lib/api-client";
-import { setChatwootVehicle } from "@/lib/chatwoot";
+import { clearChatwootVehicle, setChatwootVehicle } from "@/lib/chatwoot";
 import { useTranslation } from "@/lib/i18n";
+import { capture } from "@/lib/posthog";
 import { getUserSettings, setUserSetting } from "@/lib/user-settings";
 import { cleanModelName } from "@/lib/vehicle";
 import type { CategoryNode, Vehicle } from "@sase/shared";
@@ -46,6 +47,7 @@ function VehicleDetailPage() {
   const changeViewMode = (mode: "grid" | "tree" | "columns") => {
     setViewMode(mode);
     setUserSetting("categoryViewMode", mode);
+    capture("category_view_changed", { mode, vehicle_id: id });
   };
 
   const router = useRouter();
@@ -97,6 +99,7 @@ function VehicleDetailPage() {
         year: vehicle.year,
       });
     }
+    return () => clearChatwootVehicle();
   }, [vehicle, id]);
 
   if (vehicleLoading) {
@@ -211,7 +214,7 @@ function VehicleDetailPage() {
           <CarBrandLogo brandName={vehicle.brandName} size={32} className="shrink-0" />
         )}
         <div className="min-w-0 flex-1">
-          <h2 className="break-words text-2xl font-bold leading-tight">
+          <h2 className="break-words font-[family-name:var(--font-display)] text-2xl font-bold leading-tight tracking-tight">
             {vehicle?.brandName} {cleanModelName(vehicle?.model)}{" "}
             {vehicle?.year && `(${vehicle.year})`}
           </h2>
@@ -252,15 +255,29 @@ function VehicleDetailPage() {
           {/* Search box keeps its own padding when the columns view zeroes out
               CardContent padding. */}
           <div className={viewMode === "columns" && !searchActive ? "p-6 pb-0" : undefined}>
-            <CatalogSearch vehicleId={id} onActiveChange={setSearchActive} />
+            <CatalogSearch
+              vehicleId={id}
+              onActiveChange={(active) => {
+                setSearchActive(active);
+                if (active) capture("catalog_search_opened", { vehicle_id: id });
+              }}
+            />
           </div>
           {!searchActive &&
             (categoriesLoading ? (
-              <div className="space-y-2">
-                {KEYS_8.map((__k) => (
-                  <Skeleton key={__k} className="h-8 w-full" />
-                ))}
-              </div>
+              viewMode === "grid" ? (
+                <div className="grid grid-cols-1 gap-3 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 2xl:grid-cols-5">
+                  {KEYS_8.map((__k) => (
+                    <Skeleton key={__k} className="h-24 w-full rounded-lg" />
+                  ))}
+                </div>
+              ) : (
+                <div className="space-y-2">
+                  {KEYS_8.map((__k) => (
+                    <Skeleton key={__k} className="h-8 w-full" />
+                  ))}
+                </div>
+              )
             ) : !categoryTree || categoryTree.length === 0 ? (
               <div className="rounded-lg border border-dashed border-border bg-muted/30 px-6 py-10 text-center">
                 <p className="text-sm font-medium text-foreground">