feat(oxibadge): consolidate review toolbar and add a "shift times" action

The per-employee correction buttons (Fix shifts, Add lunch break,
Round) and the day filter used to be scattered across the employee
header. They're now grouped into a single toolbar attached to the top
of the timesheet table: a "Corrections" dropdown (with per-item counts
and an "Apply all corrections" entry) and a "Shift times" panel, plus
the existing day filter and "Undo all changes" button.

"Shift times" adds a fixed offset (in steps of the configured rounding
granularity, ±12h) to every punch in a chosen day range, for either
the current employee or everyone — for when the time clock didn't
follow a daylight-saving change. EmployeeHeader is now just the name
editor and stats; TimesheetTable no longer owns the table's outer
border/background, which moved to the new shared card wrapper.

Assisted-by: Claude Sonnet 5 <noreply@anthropic.com>

oxibadge/src/lib/components/review/TimesheetTable.svelte

@@ -166,9 +166,7 @@
     flex: 1;
     min-height: 0;
     overflow: auto;
-    border: 1px solid #262626;
-    border-radius: 14px;
-    background: #141414;
+    border-radius: 0 0 14px 14px;
   }
 
   table {