refactor(tz): take the medication and reminder trees off the zone literal

The medication and measurement-reminder code now imports DEFAULT_TIMEZONE
from the tz module like every other fallback, so the lint rule no longer
exempts those paths.

src/app/api/measurement-reminders/[id]/complete/route.ts

@@ -30,11 +30,10 @@ import { annotate } from "@/lib/logging/context";
 import { satisfyReminder } from "@/lib/measurement-reminders/satisfy";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
 import { isScreeningReminderType } from "@/lib/validations/measurement-reminders";
+import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 type RouteParams = { params: Promise<{ id: string }> };
 
-const DEFAULT_TIMEZONE = "Europe/Berlin";
-
 export const POST = apiHandler(
   async (request: NextRequest, { params }: RouteParams) => {
     // v1.37.0 — MANAGE. Marking a reminder satisfied re-anchors a schedule the level

src/app/api/measurement-reminders/[id]/route.ts

@@ -33,13 +33,11 @@ import {
 } from "@/lib/measurement-reminders/scheduling";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
 import { wallClockInTz, zonedWallClockToUtc } from "@/lib/tz/wall-clock";
-import { userDayKey } from "@/lib/tz/format";
+import { DEFAULT_TIMEZONE, userDayKey } from "@/lib/tz/format";
 import { holdsOpenAfterReminder } from "@/lib/measurement-reminders/holds-open";
 
 type RouteParams = { params: Promise<{ id: string }> };
 
-const DEFAULT_TIMEZONE = "Europe/Berlin";
-
 async function resolveTimezone(userId: string): Promise<string> {
   const row = await prisma.user.findUnique({
     where: { id: userId },

src/app/api/measurement-reminders/[id]/satisfy/route.ts

@@ -16,11 +16,10 @@ import { annotate } from "@/lib/logging/context";
 import { satisfyReminder } from "@/lib/measurement-reminders/satisfy";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
 import { isScreeningReminderType } from "@/lib/validations/measurement-reminders";
+import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 type RouteParams = { params: Promise<{ id: string }> };
 
-const DEFAULT_TIMEZONE = "Europe/Berlin";
-
 export const POST = apiHandler(
   async (request: NextRequest, { params }: RouteParams) => {
     // v1.37.0 — MANAGE. The same primitive from the checklist side re-anchors a schedule the level

src/app/api/measurement-reminders/[id]/skip/route.ts

@@ -22,11 +22,10 @@ import { apiSuccess, apiError, getClientIp } from "@/lib/api-response";
 import { annotate } from "@/lib/logging/context";
 import { skipReminder } from "@/lib/measurement-reminders/satisfy";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
+import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 type RouteParams = { params: Promise<{ id: string }> };
 
-const DEFAULT_TIMEZONE = "Europe/Berlin";
-
 export const POST = apiHandler(
   async (request: NextRequest, { params }: RouteParams) => {
     // MANAGE — the same level as satisfy/complete: deciding to let a cycle

src/app/api/measurement-reminders/[id]/snooze/route.ts

@@ -29,11 +29,10 @@ import { annotate } from "@/lib/logging/context";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
 import { snoozeMeasurementReminderSchema } from "@/lib/validations/measurement-reminders";
 import { zonedWallClockToUtc } from "@/lib/tz/wall-clock";
+import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 type RouteParams = { params: Promise<{ id: string }> };
 
-const DEFAULT_TIMEZONE = "Europe/Berlin";
-
 /** Furthest a snooze may reach: five years from now. */
 const SNOOZE_CAP_MS = 5 * 365.25 * 24 * 60 * 60 * 1000;
 

src/app/api/measurement-reminders/route.ts

@@ -25,8 +25,7 @@ import {
 } from "@/lib/measurement-reminders/scheduling";
 import { toMeasurementReminderDto } from "@/lib/measurement-reminders/dto";
 import { listMeasurementReminders } from "@/lib/measurement-reminders/list-read";
-
-const DEFAULT_TIMEZONE = "Europe/Berlin";
+import { DEFAULT_TIMEZONE } from "@/lib/tz/format";
 
 async function resolveTimezone(userId: string): Promise<string> {
   const row = await prisma.user.findUnique({