Add timeclock break/lunch tracking, manual entries, and attendance period picker

- ClockEntryType enum (Work/Break/Lunch) on EmployeeClockEntry; default 0 = Work
  so all existing entries are unaffected
- Migration AddClockEntryType applied
- Break and Lunch buttons on clock status card (only when AllowMultiplePunchesPerDay
  is enabled); GoOnBreak closes current Work segment and opens Break/Lunch segment
- Return to Work button when on break/lunch; closes break segment, opens new Work
- Status badges on clock card and Who'\''s In grid: Working / On Break / At Lunch
- Break/Lunch hours excluded from all day totals, week totals, metrics, and CSV
- Manager: Manual Entry modal to create a time entry for any company employee
- Attendance report defaults to current ISO week; Week/Month mode toggle with
  auto-submitting dropdowns (last 12 weeks or months); period label shown inline
- Attendance CSV: Type column added; day/week totals blank on Break/Lunch rows;
  filename uses period label
- Week subtotal rows suppressed in single-week view (shown in month view only)
- Help article and AI knowledge base updated for all new features

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

src/PowderCoating.Core/Entities/EmployeeClockEntry.cs

@@ -1,3 +1,5 @@
+using PowderCoating.Core.Enums;
+
 namespace PowderCoating.Core.Entities;
 
 /// <summary>
@@ -18,6 +20,12 @@ public class EmployeeClockEntry : BaseEntity
     /// <summary>Stored at clock-out time: (ClockOutTime - ClockInTime) in hours, rounded to 2 decimal places.</summary>
     public decimal? HoursWorked { get; set; }
 
+    /// <summary>
+    /// Whether this segment is regular work time, a break, or a lunch period.
+    /// Only <see cref="ClockEntryType.Work"/> entries count toward paid-hours totals.
+    /// </summary>
+    public ClockEntryType EntryType { get; set; } = ClockEntryType.Work;
+
     public string? Notes { get; set; }
 
     public virtual ApplicationUser User { get; set; } = null!;