chore: roles management groundwork

docs/design/states.md

@@ -107,3 +107,37 @@ Entry rules, 422 except unique (409): required, type, min, max, options, unique,
 
 ## Media field (pass 5)
 Copy and states are in `media-field-changes.md` (sections 2 to 6). Entry rules for a media field: required 422 "Pick an image for Thumbnail."; type 422 "Thumbnail must be an image from the library."; min, max, options and unique do not apply. A required media field added to a type with entries is refused client side in the review ("Can't be applied") and by the server as 409 schema_incompatible. Image deleted while entries use it: the control shows "This image is no longer in the library"; saving is refused only when the field is required. HTTP statuses for the picker and the field use the table above (400, 401, 403, 404, 409, 413, 429, 500, network).
+
+## Roles and permissions
+
+61 states, all Available now, listed with trigger and copy in `screens/roles.md`. Groups: Roles list 7, Role editor 15, Plain-language preview 4, Delete role 4, Users 9, Role-aware shell 8, No access 3, Activity 2, Profile 2, API keys 1, Create-a-role flow 6. None is clock-sensitive (times are fixed strings).
+
+Hidden or disabled:
+| Case | Treatment | Example |
+|---|---|---|
+| Whole area the role never has | Hidden (no sidebar item, no page card). Direct link shows the 403 page. | Schema for a Writer |
+| Action on something visible, blocked by role | Disabled with a reason in a tooltip or row text | Delete on an article for a Writer |
+| Action that only exists above their level | Hidden | Publish for a Writer; status shows Draft and "Ask an editor to publish." |
+| Row the person can read but not edit (Own) | View only mark on the row; Edit and Delete disabled in the menu | You can only edit content you created. |
+| Settings page they can read | Read-only: locked fields, banner, Save off | Admin on General without Edit general settings |
+| Owner-only action visible to an admin | Disabled, Owner only tag | Apply update |
+
+No-escalation feedback:
+| Rule | Where it shows | Copy |
+|---|---|---|
+| Grant only what you hold | Disabled segment or switch with a lock; popover on focus or hover | You can only grant what your role has. Your role can publish only entries you created, so All isn't available. |
+| No role above yours | Disabled option in the role picker (Change role, Delete reassign, Invite) | Your role can't assign a role with more power than yours. |
+| No editing your own role | Editor opens read-only with a banner | You can't change the permissions of your own role. Ask another owner or admin. |
+| No delete while it has members | Delete dialog, blocked state | 4 members have this role. Move them to another role first. Then Contributor can be deleted. |
+| Owner-only list | Disabled item with an Owner only tag and a lock | Only the owner can apply updates. |
+
+HTTP status to copy (additions):
+| Code | Status | Title | Body |
+|---|---|---|---|
+| missing_permission | 403 | You don't have permission to do that | Your role doesn't include {permission name}. Ask an owner or admin. |
+| role_locked | 403 | This role is locked | The Owner role can't be changed or deleted. Transfer ownership from Users instead. |
+| role_has_members | 409 | Role still has members | {n} members have this role. Move them to another role first. |
+| role_name_taken | 409 | Name already used | A role named "{name}" already exists. Choose a different name. |
+| role_conflict | 409 | This role changed while you were editing | {name} saved changes to {role} at {time}. Reload to see them, or review how they differ from your edits. |
+| escalation | 403 | You can't grant that | You can only grant what your role has. |
+| (page level) | 403 | You don't have access to this page | Your role, {role}, doesn't include it. Ask an owner or admin if you need it. |