fix(visits): open an upcoming appointment where it lives

Visits are the second tab of `/checkups`, and the bare path opens the
first one, the preventive-care list, which never shows an appointment.
Every surface that listed an upcoming appointment linked it there: the
dashboard's next-appointment line, the Today rail item, the Today
overview fact and the appointment's push notification. A tap on the
appointment landed on the list it is not on.

Each now opens the visit itself (`/checkups?visit=<id>`), or the visits
tab (`/checkups?view=visits`) for a line naming several appointments.
The checkups page reads `view` to pick a tab. The rail item stops
borrowing the check-up item's action: it carries its own label
("View appointment") and intent `visit.view`. The appointment push names
its visit through the producer's `metadata.url` override; a check-up's
push keeps the checkups list.

The same mis-route sat on three links that lead to visits without
being upcoming: a condition's visit rows, the address book's back link
and the onboarding and timeline prompts to add a visit.

`visit-link-guard.test.ts` keeps the visit paths in the builder and
counts every bare `/checkups` per file, each with the reason it names
the checkups list.

src/components/illness/episode-visits-card.tsx

@@ -29,6 +29,7 @@ import { Skeleton } from "@/components/ui/skeleton";
 import { useAuth } from "@/hooks/use-auth";
 import { useEncounters } from "@/hooks/use-encounters";
 import { useRecordCapabilities } from "@/hooks/use-record-capabilities";
+import { visitPath } from "@/lib/encounters/visit-links";
 import { useFormatters, useTranslations } from "@/lib/i18n/context";
 import type { EncounterKind } from "@/generated/prisma/client";
 
@@ -95,7 +96,7 @@ export function EpisodeVisitsCard({ episodeId }: { episodeId: string }) {
                 <li key={visit.id}>
                   <ListRow asChild>
                     <Link
-                      href="/checkups"
+                      href={visitPath(visit.id)}
                       data-encounter-id={visit.id}
                       className="hover:bg-muted/50 focus-visible:ring-ring/50 flex items-center gap-3 focus-visible:ring-[3px] focus-visible:outline-none"
                     >