fix: align frontend zod schemas with backend validation rules

Tightened frontend zod schemas where backend required fields the frontend marked optional, and matched enum/format constraints.

Schemas:
- vehicle-document: document_type required
- parts: shop_type, category, unit_type, department, sku required
- inspections: customer, vehicle, department, inspection_category, employee, order_number, date, time required
- appointments: service_writer required, cross-field to_time > from_time
- vendor-credits: vendor + vendor_credit_date required
- job-cards: documents[].document_type_id required
- expense-items: category, unit_type, department, sku required
- inventory-adjustments: reference_number, date required
- tasks: task_type, task_section required
- shop-timings: in_time, out_time enforce HH:MM:SS regex
- vendor-credit: subject + vendor + vendor_credit_date required

Settings:
- shop-type: shop_type + note required
- insurance-types: description field added, required
- make-and-models: shop_type required, year 1900..2100
- departments: assignment_type required enum (AssignmentType)
- company: website URL validation, latitude/longitude range, first_day_of_work enum, string max lengths
- configurations: 4 fields enum-typed (was raw strings)

Inline forms:
- job-card service/part/expense-item: relations required (part/service/expense_item/department)
- job-card recommendation: max 255
- vehicles/inline-forms/shop-type: shop_type + note required
- vehicles/inline-forms/body-type: shop_type_id pulled from parent form context, guard on submit
- vehicles/inline-forms/color: code field added, required
- services/inline-forms/department: assignment_type required enum
- tasks/task-section: arrangement required integer
- invoices/invoice-edit: status + discount enum-typed

Auth:
- login: password min 6 (was 8; backend allows 6)

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

apps/dashboard/modules/invoices/invoice-edit-form.tsx

@@ -22,13 +22,13 @@ import { z } from "zod"
 // ── Schema for edit form (simplified, edit only) ──
 
 const invoiceEditFormSchema = z.object({
-    subject: z.string().min(1, "Subject is required"),
+    subject: z.string().min(1, "Subject is required").max(255, "Subject cannot exceed 255 characters"),
     due_date: z.string().optional(),
-    invoice_title: z.string().optional(),
+    invoice_title: z.string().max(255, "Invoice title cannot exceed 255 characters").optional(),
     notes: z.string().optional(),
     terms_and_conditions: z.string().optional(),
-    status: z.string().optional(),
-    discount: z.string().optional(),
+    status: z.enum(InvoiceStatus).optional(),
+    discount: z.enum(InvoiceDiscount).optional(),
 })
 
 type InvoiceEditFormValues = z.infer<typeof invoiceEditFormSchema>
@@ -53,7 +53,7 @@ const DEFAULT_VALUES: InvoiceEditFormValues = {
     invoice_title: "",
     notes: "",
     terms_and_conditions: "",
-    status: "",
+    status: undefined,
     discount: "no",
 }
 
@@ -67,7 +67,7 @@ function mapToFormValues(data: unknown): InvoiceEditFormValues {
         invoice_title: d.invoice_title || "",
         notes: d.notes || "",
         terms_and_conditions: d.terms_and_conditions || "",
-        status: d.status || "",
+        status: d.status || undefined,
         discount: d.discount || "no",
     }
 }