feat(catalog): class template editing

Templates were delete-and-recreate only. Adds PUT
/v1/catalog/class-templates/{id} across repository, service (sharing
the create-time validation), route, spec, and client; the classes tab
gets a pencil action that loads the row into the form with a
save/cancel affordance.

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project.md

@@ -112,6 +112,10 @@
   - `CustomerBookingView` carries `waitlistPosition` for waitlisted class bookings; the manage page now shows a proper status badge for `waitlisted`/`cancelled` (previously both rendered as "Pending") plus a notice with the queue position and the auto-promotion explanation, in CS and EN
   - fixed invalid token names along the way (`--danger-soft`/`--warning-soft` do not exist; `--error-subtle`/`--warning-subtle` do)
   - remaining: live staging validation; manual waitlist promotion controls are still not exposed
+- `[done/partial]` Milestone 17: Class template editing
+  - `PUT /v1/catalog/class-templates/{id}` end-to-end: `UpdateClassTemplate` in both repositories, catalog service method sharing `validateClassTemplateInput` with create, route, OpenAPI path, regenerated client
+  - classes tab template rows gained a pencil edit action that loads the template into the form; the submit button switches to save-changes with a cancel affordance
+  - remaining: live staging validation
 
 ## Overview
 Bookra is a Czech-first booking SaaS for small local service businesses. It targets salons, massage therapists, small clinics, repair shops, and small studios/clubs that need a simple public booking flow, internal schedule management, reminders, and basic business reporting without becoming a full ERP.