feat(notifications): strengthen the Web Push path for PWA-only self-hosters

Self-hosters without an Apple Developer account rely on Web Push to the
installed PWA — there is no Live Activity or lock-screen widget to drive.
Make that path carry the dose lifecycle on its own:

- Stable per-slot tag. The medication dose-due reminder now sets a
  `med:<id>:<iso-slot>` Web Push tag (medicationDoseTag), so a re-fired
  reminder for the same slot coalesces instead of stacking, and a later
  clear can target it.
- Clear-on-taken. When a dose is marked taken or skipped, push a
  `type:"clear"` notification reusing that slot tag. The service worker
  closes the matching pending reminder and refreshes the badge — the PWA
  equivalent of ending a Live Activity. A snooze leaves the dose
  outstanding and clears nothing. Wired into the single + bulk intake
  routes alongside the existing APNs cross-device sync.
- App badge. The dispatcher carries a server-authoritative outstanding-
  dose count; the SW reflects it via the Badging API
  (setAppBadge/clearAppBadge), feature-detected and a no-op where
  unsupported.
- The SW push handler honours requireInteraction for urgent events and
  renotify so a re-fired reminder re-alerts.

Dose-due, preventive-care, and low-stock reminders already cascade to
Web Push when no APNs channel exists; tests pin that an APNs-less
instance still delivers.

src/app/api/medications/intake/bulk/route.ts

@@ -69,6 +69,8 @@ import {
 } from "@/lib/validations/medication";
 import type { InjectionSiteKey } from "@/lib/medications/injection-sites";
 import { dispatchMedicationIntakeSyncBulk } from "@/lib/notifications/medication-intake-sync";
+import { dispatchMedicationIntakeWebClearBulk } from "@/lib/notifications/web-push-clear";
+import { countOutstandingDosesToday } from "@/lib/medications/outstanding-doses";
 
 const MAX_ENTRIES_PER_BATCH = 500;
 const BATCH_RATE_LIMIT_MAX = 60;
@@ -711,6 +713,23 @@ async function postBulk(request: NextRequest): Promise<Response> {
       slots: Array.from(syncSlots.values()),
       originDeviceToken: request.headers.get("x-device-id"),
     });
+
+    // v1.18.4 — PWA-only counterpart: close the still-pending dose-due
+    // reminders for every affected slot over Web Push and refresh the app
+    // badge once with the post-batch outstanding-dose count. Best-effort,
+    // fire-and-forget — a clear miss never affects the batch response.
+    const affectedSlots = Array.from(syncSlots.values());
+    void (async () => {
+      const badgeCount = await countOutstandingDosesToday(
+        user.id,
+        user.timezone,
+      );
+      await dispatchMedicationIntakeWebClearBulk({
+        userId: user.id,
+        slots: affectedSlots,
+        badgeCount,
+      });
+    })();
   }
 
   return apiSuccess({

src/app/api/medications/intake/route.ts

@@ -51,6 +51,8 @@ import {
   type InjectionSiteValue,
 } from "@/lib/validations/medication";
 import { dispatchMedicationIntakeSync } from "@/lib/notifications/medication-intake-sync";
+import { dispatchMedicationIntakeWebClear } from "@/lib/notifications/web-push-clear";
+import { countOutstandingDosesToday } from "@/lib/medications/outstanding-doses";
 
 const querySchema = z.object({
   scope: z.enum(["today", "compliance"]),
@@ -698,5 +700,23 @@ export const POST = apiHandler(async (request: NextRequest) => {
     originDeviceToken: request.headers.get("x-device-id"),
   });
 
+  // v1.18.4 — PWA-only equivalent of the Live Activity end: when a dose is
+  // resolved (taken / skipped), push a `type:"clear"` to the user's Web Push
+  // subscriptions so the still-pending dose-due reminder for this slot is
+  // closed by the service worker (matched on the stable slot tag) and the app
+  // badge re-reflects the outstanding-dose count. A snooze leaves the dose
+  // outstanding, so it neither clears the reminder nor changes the badge.
+  if (status === "taken" || status === "skipped") {
+    void (async () => {
+      const badgeCount = await countOutstandingDosesToday(user.id, userTzForHook);
+      await dispatchMedicationIntakeWebClear({
+        userId: user.id,
+        medicationId: existing.medicationId,
+        scheduledFor: (movedTo ?? existing.scheduledFor).toISOString(),
+        badgeCount,
+      });
+    })();
+  }
+
   return apiSuccess(updated);
 });