Add Employee Timeclock feature with kiosk, attendance report, and payroll CSV export

- New EmployeeClockEntry entity (facility-level attendance, separate from job time entries)
- KioskPin added to ApplicationUser; TimeclockKioskToken added to Company
- TimeclockController: clock in/out, who's in, 14-day history, manager edit/delete,
  tablet kiosk with device-cookie auth, PIN management via Users edit page
- Kiosk UI: employee tile grid + 4-digit PIN pad + auto-detect clock-in vs clock-out
- Attendance report at /Reports/Attendance with weekly subtotal rows
- Payroll CSV export at /Reports/AttendanceCsv (flat, one row per segment)
- AllowCustomFormulas wired through PlatformSubscriptionController + subscription views
- Fix soft-delete bug on CustomItemTemplate (missing HasQueryFilter in OnModelCreating)
- Help article (Help/Timeclock.cshtml) and AI knowledge base updated
- Migrations: AddEmployeeTimeclock, AddTimeclockKioskToken

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

src/PowderCoating.Web/Views/Help/Index.cshtml

@@ -205,6 +205,22 @@
                     </div>
                 </div>
             </div>
+            <div class="col-md-6">
+                <div class="card border-0 shadow-sm h-100">
+                    <div class="card-body">
+                        <div class="d-flex align-items-start gap-3">
+                            <div class="rounded-3 bg-success bg-opacity-10 p-2 flex-shrink-0">
+                                <i class="bi bi-clock-history text-success fs-4"></i>
+                            </div>
+                            <div>
+                                <h5 class="card-title mb-1">Timeclock</h5>
+                                <p class="card-text text-muted small mb-2">Track employee attendance with daily clock-in/clock-out. Multi-segment days, tablet kiosk mode with PIN, and attendance reports.</p>
+                                <a asp-controller="Help" asp-action="Timeclock" class="btn btn-sm btn-outline-success">Read more <i class="bi bi-arrow-right ms-1"></i></a>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
         </div>
 
         <!-- Reports & Admin -->