Show a series' policy acceptances on every occurrence

A weekly booking reserves a series of lessons, but the student answers
the intake and ticks the policy boxes once — so BookingEndpoint records
both against the anchor lesson alone. The admin detail view looked them
up by whichever lesson id was being viewed, so every occurrence after
the first showed no answers and no acceptances at all.

LessonDetail now takes the Lesson rather than a bare id and resolves the
registration to `series_id ?? id`, so each occurrence reads the anchor's
records. This is the same seam PaymentService already uses to find a
series lesson's payment on the anchor.

Nothing was ever missing from the database, so existing bookings read
correctly with no migration and no schema change.

Closes #167

Co-Authored-By: Claude Opus 5 <[email protected]>

CHANGELOG.md

@@ -18,6 +18,9 @@ each change under the current top section as you work.
 - **You can now edit your own details on the profile page**, not just your students'. The page is called **Your profile**, and until now the one person on it you could not change was yourself: a mistyped name at signup, or a name that had since changed, meant asking the studio to fix it. **Your details** now sits at the top of the page with your name, your birth year, and whether you take lessons yourself. Your email address is shown but not editable — it is also how you sign in, so changing it stays a studio-side job.
 - **"I take lessons myself" can be corrected after signup.** Signup asks whether you are registering just yourself, only on behalf of students, or both, and the answer decides whether you are offered as a student when booking. Choosing wrongly — or taking up lessons later alongside the children you book for — used to leave you asking the studio to change it. Ticking the box makes you bookable again and asks for your birth year like any other student; unticking it takes you back off the list without discarding the birth year you already gave, so ticking it back on costs you nothing.
 
+### Fixed
+- **A recurring lesson now shows the policies the student accepted on every week of it, not just the first.** Booking a weekly lesson reserves a series of them, and the student answers the intake questions and agrees to the studio's policies once, for the whole reservation. Opening any week after the first showed no answers and no policies accepted — as though nothing had been agreed to. Nothing was ever missing: the agreement was recorded against the first lesson of the series and every other week was looking for one of its own. Each week of a series now shows the intake answers and the full acceptance record — policy, version, when it was accepted, and from where — captured when the reservation was booked. Existing bookings read correctly straight away; there is nothing to re-collect from anyone.
+
 ## [1.4.1]
 
 ### Added