docs(GRO-1173): add UAT test cases for buffer rules, service buffer, and pet size/coat

Sections 5.20, 5.21, and 5.22 added to UAT_PLAYBOOK.md:
- TC-WEB-5.20.x: Buffer rules CRUD, validation, empty state (14 cases)
- TC-WEB-5.21.x: Service default buffer field in table and form (7 cases)
- TC-WEB-5.22.x: Pet size category and coat type in portal PetForm (7 cases)

Co-Authored-By: Paperclip <noreply@paperclip.ing>

UAT_PLAYBOOK.md

@@ -216,6 +216,49 @@ export const { signIn, signOut, useSession, changePassword } = authClient;
 | TC-WEB-5.19.8 | Form reset clears size/coat | Complete booking, click "Book another" | Size and coat fields reset to empty |
 | TC-WEB-5.19.9 | New pet record has size/coat | Complete booking, view created pet in admin | Pet record shows selected size and coat type |
 
+### 5.20 Buffer Rules Management — Admin UI (GRO-1173)
+
+| # | Scenario | Steps | Expected |
+|---|----------|-------|----------|
+| TC-WEB-5.20.1 | Buffer rules section loads | Navigate to Settings page (admin) | "Buffer Rules" section visible with "+ Add Rule" button |
+| TC-WEB-5.20.2 | Add rule — required fields only | Click "+ Add Rule", select a service, enter buffer minutes, submit | Rule created, appears in list below |
+| TC-WEB-5.20.3 | Add rule — with size category | Add rule, select service + size category + buffer minutes | Rule created with size tag shown in list |
+| TC-WEB-5.20.4 | Add rule — with coat type | Add rule, select service + coat type + buffer minutes | Rule created with coat tag shown in list |
+| TC-WEB-5.20.5 | Add rule — with both size and coat | Add rule, select service + size + coat + buffer minutes | Rule created with both tags shown |
+| TC-WEB-5.20.6 | Validation — missing service | Submit form without selecting service | Error: "Service and valid buffer minutes are required" |
+| TC-WEB-5.20.7 | Validation — zero buffer | Submit form with 0 buffer minutes | Error: "Service and valid buffer minutes are required" |
+| TC-WEB-5.20.8 | Edit rule inline | Click "Edit" on a rule, change buffer value, click "Save" | Rule updated in list |
+| TC-WEB-5.20.9 | Cancel edit | Click "Edit", then "Cancel" | Original value unchanged |
+| TC-WEB-5.20.10 | Delete rule — confirmation | Click "Delete" on a rule | Confirmation prompt appears |
+| TC-WEB-5.20.11 | Confirm delete | On confirmation prompt, click "Confirm" | Rule removed from list |
+| TC-WEB-5.20.12 | Cancel delete | On confirmation prompt, click "Cancel" | Rule remains in list |
+| TC-WEB-5.20.13 | Empty state | No rules exist | Message: "No buffer rules configured yet." |
+| TC-WEB-5.20.14 | Toggle form | Click "+ Add Rule", then "Cancel" | Form hidden, no rule created |
+
+### 5.21 Service Default Buffer Minutes (GRO-1173)
+
+| # | Scenario | Steps | Expected |
+|---|----------|-------|----------|
+| TC-WEB-5.21.1 | Default buffer shown in table | Navigate to Services page | "Default Buffer" column visible in services table |
+| TC-WEB-5.21.2 | New service default is 0 | Click "+ Add Service" | Default Buffer field pre-filled with 0 |
+| TC-WEB-5.21.3 | Create service with buffer | Fill service form, set Default Buffer = 10, submit | Service created with 10 min default buffer |
+| TC-WEB-5.21.4 | Edit service — view buffer | Edit an existing service | Current default buffer value shown in form |
+| TC-WEB-5.21.5 | Update buffer on existing service | Edit service, change Default Buffer to 15, save | Buffer updated, table shows 15 min |
+| TC-WEB-5.21.6 | Buffer field — zero allowed | Set Default Buffer to 0, save | Service saved with 0 (no default buffer) |
+| TC-WEB-5.21.7 | Buffer field — integer only | Enter non-integer value | Field restricts to integer values |
+
+### 5.22 Pet Profile — Size Category & Coat Type (GRO-1173)
+
+| # | Scenario | Steps | Expected |
+|---|----------|-------|----------|
+| TC-WEB-5.22.1 | Size category dropdown visible | Open Add Pet or Edit Pet form (portal) | "Size Category" dropdown visible with options: Small, Medium, Large, X-Large |
+| TC-WEB-5.22.2 | Coat type dropdown visible | Open Add Pet or Edit Pet form | "Coat Type" dropdown visible with options: Smooth, Double, Curly, Wire, Long, Hairless |
+| TC-WEB-5.22.3 | Size and coat both optional | Submit pet form without selecting size or coat | Pet saved successfully |
+| TC-WEB-5.22.4 | Save pet with size category | Select "Large", fill required fields, save | Pet saved with size = "large" |
+| TC-WEB-5.22.5 | Save pet with coat type | Select "Curly", fill required fields, save | Pet saved with coat = "curly" |
+| TC-WEB-5.22.6 | Size and coat persisted | Save pet with size + coat, edit again | Both fields retain their selected values |
+| TC-WEB-5.22.7 | Clear size | Select size, then clear back to default | Size cleared on save |
+
 ## 6. Pass/Fail Criteria
 
 **Pass:**