docs: update all documentation for reschedule modal, time blockers UI, and booking flow improvements

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

README.md

@@ -19,6 +19,11 @@ Nail salon booking platform — Go 1.25 backend + SvelteKit 5 frontend + Docker.
 - **Admin notifications**: priority-sorted queue with bell icon, `/notifications` page, acknowledge flow
 - **User notification preferences**: per-channel toggles (email, SMS, browser) in account settings
 - **Enriched edit requests**: side-by-side original vs proposed booking snapshots (time, services, prices, durations, user details) for admin review
+- **Admin reschedule modal**: full reschedule UI on Today page with real-time available slot lookup, conflict detection, and one-click confirmation
+- **Time blockers UI**: admin can create/manage one-off and recurring time blockers directly from the Admin dashboard, with overlap detection against existing bookings
+- **Today page enhancements**: interactive daily calendar grid with visual time blockers, today stats summary, responsive layout improvements
+- **Auto-select availability**: all booking flows (self-service, admin create, edit request) automatically select the first available date when data loads
+- **Shared time slot utilities**: extracted common time slot generation, lunch protection, and formatting logic into a reusable module
 
 ## Project Structure
 
@@ -34,7 +39,11 @@ Crussell/
 ├─ frontend/           # SvelteKit 5 SPA (static build)
 │  └─ src/lib/components/
 │     ├─ payments/     # PaymentModal (admin), UserPaymentModal (user)
-│     └─ booking/      # BookingFlow (5-step wizard)
+│     ├─ booking/      # BookingFlow (5-step wizard), DatePicker, TimeSlotPicker, TimeSlotList, SelectedTimeSummary
+│     ├─ admin/        # BookingCreateModal, RescheduleModal, TimeBlockers, WeeklySchedule, HolidayHours, etc.
+│     ├─ today/        # TodayCalendar (interactive grid), CurrentAppointment, PendingApprovals, TodayStats
+│     └─ account/      # EditRequestModal, UserBookingModal
+├─ frontend/src/lib/utils/  # Shared utilities (timeSlots.ts)
 ├─ sabredav/           # PHP + Composer for DAV
 ├─ nginx/              # Nginx reverse-proxy for HTTP & HTTPS
 ├─ init-scripts/       # PostgreSQL init SQL
@@ -90,7 +99,7 @@ cd backend && go build -o bin/backend ./main.go
 # Frontend
 cd frontend && npm ci && npm run build
 
-# Tests (438/441 passing, 3 skipped)
+# Tests (444/447 passing, 3 skipped)
 cd backend && go test -tags "test,dev" ./...
 ```