improvement: task assignment flow added. cases and tasks feature updated accordingly.

frontend/messages/en.json

@@ -435,6 +435,10 @@
     "errorLoadList": "Failed to load cases.",
     "errorLoadDetail": "Failed to load case details.",
     "errorUpdateTask": "Failed to update task.",
+    "errorAssignTask": "Failed to assign task.",
+    "assigneeLabel": "Assigned to",
+    "assigneeUnassigned": "Unassigned",
+    "assignedTo": "Assigned to {name}",
     "filterClinic": "Clinic",
     "filterClinicAll": "All clinics",
     "filterTreatmentType": "Treatment type",
@@ -483,6 +487,8 @@
     "filterStepCompletedAll": "Any step",
     "showCompleted": "Show completed",
     "importantOnly": "Important first",
+    "assignedToMe": "Assigned to me",
+    "assignedToStaff": "Assigned to {name}",
     "resetView": "Reset filters & sort",
     "showInCase": "Show in case",
     "showInCaseNotFound": "This task is not in the default in-progress list.",