feat: enriched edit request system with side-by-side snapshots, calendar preloading, and admin review UI

Backend:
- Add enriched response types (EditSnapshot, EnrichedEditRequest) with original vs proposed snapshots
- Add 4 new GET endpoints for viewing edit requests (user and admin scoped)
- Remove github.com/lib/pq dependency — use native PostgreSQL array scanning
- Clean up edit requests, time blockers, and notifications on booking cancellation
- Validate exceptional closed hours on admin approve (409 Conflict)
- Notification upsert on edit request replace (no duplicate admin notifications)

Frontend:
- New user EditRequestModal with time/services/both modes and lunch protection
- New admin EditRequestModal with side-by-side diff (date/time, services, notes)
- Integrate edit requests into PendingApprovals card and notifications page
- Preload 3 months of availability to prevent calendar snap-back
- Apply lunch protection to isDateUnavailable in BookingFlow and BookingCreateModal
- Fix accessibility: card list items use <button> instead of <div>

Dev & Docs:
- Seed edit requests in local-dev-2.sh
- Update all Obsidian manuals with enriched edit request documentation
- 42 new tests (438/441 passing)

local-dev-2.sh

@@ -1007,6 +1007,81 @@ if api_post "$BASE_URL/scheduling/exceptional-groups" "$XMAS_BREAK"  "Christmas
 
 echo "${C_GREEN}✅ Created $sched_success/3 Exceptional Schedule Groups${C_RESET}"
 
+# ===========================================================================
+# 7b. EDIT REQUESTS (for testing the edit request UI)
+# ===========================================================================
+echo -e "\n${C_BLUE}✏️ Creating Edit Requests...${C_RESET}"
+edit_req_count=0
+
+# Create edit requests via the user API for upcoming confirmed bookings
+# Use a wider time window to find more bookings (any future confirmed booking)
+CONFIRMED_BOOKINGS=$(docker exec postgres psql -U myuser -d mydb -tAc \
+  "SELECT b.id, b.user_id, b.start_time FROM bookings b
+   WHERE b.status = 'confirmed' AND b.start_time > NOW()
+   ORDER BY b.start_time ASC LIMIT 8;" 2>/dev/null)
+
+if [[ -n "$CONFIRMED_BOOKINGS" ]]; then
+  req_idx=0
+  while IFS='|' read -r booking_id user_id start_time; do
+    [[ -z "$booking_id" ]] && continue
+    # Get user token
+    user_email=$(docker exec postgres psql -U myuser -d mydb -tAc \
+      "SELECT email FROM users WHERE id = '$user_id'" 2>/dev/null | tr -d '\r\t ')
+    [[ -z "$user_email" ]] && continue
+    user_tok=$(login "$user_email" "password")
+    [[ -z "$user_tok" ]] && continue
+
+    # Alternate between time-only and service+time requests
+    if (( req_idx % 3 == 0 )); then
+      # Time-only request
+      new_time=$(TZ=Europe/London date -d "$start_time +2 hours" +"%Y-%m-%dT%H:%M:%S%:z" 2>/dev/null)
+      [[ -z "$new_time" ]] && continue
+      resp=$(curl -s -w "\n%{http_code}" -X POST \
+        -H 'Content-Type: application/json' \
+        -H "Authorization: Bearer $user_tok" \
+        -d "{\"new_start_time\":\"$new_time\",\"notes\":\"Would like to move this appointment 2 hours later please\"}" \
+        "$BASE_URL/bookings/$booking_id/edit-request")
+    elif (( req_idx % 3 == 1 )); then
+      # Service change request (add nail art)
+      resp=$(curl -s -w "\n%{http_code}" -X POST \
+        -H 'Content-Type: application/json' \
+        -H "Authorization: Bearer $user_tok" \
+        -d "{\"new_services\":[\"$(get_svc 0)\",\"$(get_svc 5)\"],\"notes\":\"Would like to add nail art to my appointment\"}" \
+        "$BASE_URL/bookings/$booking_id/edit-request")
+    else
+      # Both time and services
+      new_time=$(TZ=Europe/London date -d "$start_time -1 hours" +"%Y-%m-%dT%H:%M:%S%:z" 2>/dev/null)
+      [[ -z "$new_time" ]] && continue
+      resp=$(curl -s -w "\n%{http_code}" -X POST \
+        -H 'Content-Type: application/json' \
+        -H "Authorization: Bearer $user_tok" \
+        -d "{\"new_start_time\":\"$new_time\",\"new_services\":[\"$(get_svc 1)\"],\"notes\":\"Need to reschedule earlier and switch to gel\"}" \
+        "$BASE_URL/bookings/$booking_id/edit-request")
+    fi
+    code=$(echo "$resp" | tail -n1)
+    if [[ "$code" =~ ^2 ]]; then
+      edit_req_count=$((edit_req_count+1))
+    fi
+    req_idx=$((req_idx+1))
+  done <<< "$CONFIRMED_BOOKINGS"
+fi
+
+echo "${C_GREEN}✅ Created $edit_req_count Edit Requests${C_RESET}"
+
+# ===========================================================================
+# 7c. MORE TIME BLOCKERS (for variety)
+# ===========================================================================
+echo -e "\n${C_BLUE}🚫 Creating Additional Time Blockers...${C_RESET}"
+extra_blockers=0
+
+tb "$(format_london_time "$(open_day "$(TZ=Europe/London date -d "$TODAY +3 days" +%Y-%m-%d)")" "$SLOT_B")" 90 "Equipment maintenance"
+tb "$(format_london_time "$(open_day "$(TZ=Europe/London date -d "$TODAY +10 days" +%Y-%m-%d)")" "$SLOT_C")" 60 "Training session"
+tb "$(format_london_time "$(open_day "$(TZ=Europe/London date -d "$TODAY +14 days" +%Y-%m-%d)")" "09:00:00")" 60 "Opening delay"
+tb "$(format_london_time "$(open_day "$(TZ=Europe/London date -d "$TODAY +5 days" +%Y-%m-%d)")" "$SLOT_D")" 45 "Supplier visit"
+tb "$(format_london_time "$(open_day "$(TZ=Europe/London date -d "$TODAY +8 days" +%Y-%m-%d)")" "$SLOT_A")" 120 "Deep clean — morning closed"
+
+echo "${C_GREEN}✅ Created $extra_blockers Additional Time Blockers${C_RESET}"
+
 # ===========================================================================
 # SUMMARY
 # ===========================================================================
@@ -1032,7 +1107,8 @@ echo -e "  Confirmed          : $confirmed_count  |  Still pending: $skipped_cou
 echo -e "  Bookings — guest   : $count_guest"
 echo -e "  Bookings — w/ notes: $USER_NOTE_COUNT (pending notifications)"
 echo -e "  Payments           : $payment_count completed bookings"
-echo -e "  Time blockers      : $count_blockers"
+echo -e "  Time blockers      : $((count_blockers + extra_blockers))"
+echo -e "  Edit requests      : $edit_req_count"
 echo -e "  Schedule groups    : $sched_success/3"
 echo ""
 echo -e "  Quick login creds (all pass: ${C_YELLOW}password${C_RESET})"