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/Enums/TimeclockEnums.cs

@@ -0,0 +1,17 @@
+namespace PowderCoating.Core.Enums;
+
+/// <summary>
+/// Labels what kind of time a <see cref="PowderCoating.Core.Entities.EmployeeClockEntry"/> represents.
+/// Only <see cref="Work"/> segments count toward paid-hours totals; Break and Lunch are informational.
+/// </summary>
+public enum ClockEntryType
+{
+    /// <summary>Normal productive work time (default).</summary>
+    Work = 0,
+
+    /// <summary>Short rest/break period — unpaid, excluded from hour totals.</summary>
+    Break = 1,
+
+    /// <summary>Meal/lunch period — unpaid, excluded from hour totals.</summary>
+    Lunch = 2
+}