Hide email controls when no email on file; show SMS hint for quote/job events

- Quotes Create/Edit: hide 'Send via email' checkbox when customer has no
  email; show badge 'send via SMS from details' or 'SMS consent required'
  when customer has a mobile number. JS responds to customer dropdown change.
- Quotes Details: hide 'Send Quote via Email' button and approval email
  checkbox; hide SMS button when no mobile; show consent-required note.
- Jobs Details (Mark Complete modal): hide email checkbox; show
  'SMS notification will be sent' badge or consent-required note.
- Jobs Index (status modal): hide email row when customer has no email.
- Jobs Edit: hide 'Notify customer if status changes' when no email.
- Invoices Details: hide Send/Re-send buttons when no email (vs. disabled).

DTOs: added CustomerEmail + CustomerNotifyByEmail to JobDto/JobListDto;
added CustomerNotifyByEmail/CustomerMobilePhone/CustomerNotifyBySms to
QuoteDto. Mapped in JobProfile and QuotesController customer blocks.

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

src/PowderCoating.Web/Views/Jobs/Details.cshtml

@@ -1840,13 +1840,28 @@
                     }
                 </div>
                 <div class="modal-footer justify-content-between">
-                    <div class="form-check form-switch mb-0">
-                        <input class="form-check-input" type="checkbox" role="switch"
-                               id="completeJobSendEmail" name="SendEmailToCustomer" value="true"
-                               @(ViewBag.EmailDefaultOnComplete == true ? "checked" : "") />
-                        <label class="form-check-label small" for="completeJobSendEmail">
-                            <i class="bi bi-envelope me-1"></i>Notify customer via email
-                        </label>
+                    <div class="d-flex align-items-center gap-2 flex-wrap">
+                        @if (!string.IsNullOrWhiteSpace(Model.CustomerEmail))
+                        {
+                            <div class="form-check form-switch mb-0">
+                                <input class="form-check-input" type="checkbox" role="switch"
+                                       id="completeJobSendEmail" name="SendEmailToCustomer" value="true"
+                                       @(ViewBag.EmailDefaultOnComplete == true ? "checked" : "") />
+                                <label class="form-check-label small" for="completeJobSendEmail">
+                                    <i class="bi bi-envelope me-1"></i>Notify customer via email
+                                </label>
+                            </div>
+                        }
+                        @if (Model.CustomerNotifyBySms && !string.IsNullOrWhiteSpace(Model.CustomerMobilePhone))
+                        {
+                            <span class="badge bg-info text-white">
+                                <i class="bi bi-phone me-1"></i>SMS notification will be sent
+                            </span>
+                        }
+                        else if (!string.IsNullOrWhiteSpace(Model.CustomerMobilePhone) && !Model.CustomerNotifyBySms)
+                        {
+                            <span class="text-muted small"><i class="bi bi-phone-slash me-1"></i>SMS consent required</span>
+                        }
                     </div>
                     <div>
                         <button type="button" class="btn btn-secondary me-2" data-bs-dismiss="modal">Cancel</button>