feat: add schedule column labels, office hours enforcement, and appointment move fix

- Schedule columns default to labels A–F (localStorage, per-browser, click to rename)
- Settings → Advanced → Office Hours: configure Doctors (A-C) and Hygienists (D-F) AM/PM hours per weekday
- Gray out schedule slots outside office hours; override dialog for manual exceptions
- Override Office Hours toggle: select specific dates where all slots are open
- Fix appointment move: send only real DB fields to avoid Zod strict-mode rejection of computed fields (hasProcedures, hasClaimWithNumber)
- Fix backend PUT /appointments: safe error logging to prevent Prisma error crashing Node inspect
- Add OfficeHours Prisma model and GET/PUT /api/office-hours route

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/shared/helpers/decimal-helpers.ts

@@ -1,8 +1,7 @@
 import * as z from 'zod';
 
-import type { Prisma } from '../../generated/prisma';
-
-import Decimal from "decimal.js";
+import { Prisma } from '../../generated/prisma';
+import Decimal from 'decimal.js';
 
 // DECIMAL HELPERS
 //------------------------------------------------------
@@ -24,7 +23,7 @@ export const isValidDecimalInput = (
   if (v === undefined || v === null) return false;
   return (
     // Explicit instance checks first
-    v instanceof Decimal ||
+    v instanceof Prisma.Decimal ||
     // If Decimal.js is present and imported by the generator, this symbol exists at runtime
     // eslint-disable-next-line @typescript-eslint/ban-ts-comment
     // @ts-ignore - Decimal may be undefined when not installed; codegen controls the import