feat: Add time block approval workflow and staff permission system

- Add TimeBlock approval status with manager approval workflow
- Create core mixins for staff permission restrictions (DenyStaffWritePermission, etc.)
- Add StaffDashboard page for staff-specific views
- Refactor MyAvailability page for time block management
- Update field mobile status machine and views
- Add per-user permission overrides via JSONField
- Document core mixins and permission system in CLAUDE.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/i18n/locales/en.json

@@ -491,7 +491,39 @@
     "reactivateAccount": "Reactivate Account",
     "deactivateHint": "Prevent this user from logging in while keeping their data",
     "reactivateHint": "Allow this user to log in again",
-    "deactivate": "Deactivate"
+    "deactivate": "Deactivate",
+    "canSelfApproveTimeOff": "Can self-approve time off",
+    "canSelfApproveTimeOffHint": "Add time off without requiring manager/owner approval"
+  },
+  "staffDashboard": {
+    "welcomeTitle": "Welcome, {{name}}!",
+    "weekOverview": "Here's your week at a glance",
+    "noResourceLinked": "Your account is not linked to a resource yet. Please contact your manager to set up your schedule.",
+    "currentAppointment": "Current Appointment",
+    "nextAppointment": "Next Appointment",
+    "viewSchedule": "View Schedule",
+    "todayAppointments": "Today",
+    "thisWeek": "This Week",
+    "completed": "Completed",
+    "hoursWorked": "Hours Worked",
+    "appointmentsLabel": "appointments",
+    "totalAppointments": "total appointments",
+    "completionRate": "completion rate",
+    "thisWeekLabel": "this week",
+    "upcomingAppointments": "Upcoming",
+    "noUpcoming": "No upcoming appointments",
+    "weeklyOverview": "This Week",
+    "appointments": "Appointments",
+    "today": "Today",
+    "tomorrow": "Tomorrow",
+    "scheduled": "Scheduled",
+    "inProgress": "In Progress",
+    "cancelled": "Cancelled",
+    "noShows": "No-Shows",
+    "viewMySchedule": "View My Schedule",
+    "viewScheduleDesc": "See your daily appointments and manage your time",
+    "manageAvailability": "Manage Availability",
+    "availabilityDesc": "Set your working hours and time off"
   },
   "tickets": {
     "title": "Support Tickets",