Add Today action lists and clickable KPI links (Phase 3).

Show upcoming appointments for the rest of today and link each KPI card to its relevant dashboard tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/messages/en.json

@@ -212,7 +212,11 @@
     "chartTreatmentMixSubtitle": "Last 7 days",
     "chartTasksByStepTitle": "Tasks by Workflow Step",
     "chartTasksByStepSubtitle": "In progress now",
-    "chartEmpty": "No data for this period yet."
+    "chartEmpty": "No data for this period yet.",
+    "upcomingAppointmentsTitle": "Upcoming Today",
+    "upcomingAppointmentsSubtitle": "Appointments not yet finished",
+    "viewAllAppointments": "View schedule",
+    "noUpcomingAppointments": "No upcoming appointments for the rest of today."
   },
   "staff": {
     "redirecting": "Redirecting…",