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feat(studio): send the platform marker on flag tracking calls (#53165)

I changed Studio's feature-flag tracking call to send `platform:
'studio'`, so `$feature_flag_called` events captured by the management
API carry the same app marker as Studio's other events (#53078). I held
this step back until the API's strict flag-track body schema accepted
the field in production, which it has since 2026-11-09.

**Note:** I regenerated `packages/api-types` with a full `codegen:prod`
run, so it also includes other recent production API additions. The
`verify-production-api-types` check diffs every type file against
production, so a single-type update would fail it.

## To test

Accept the cookie banner first: flag tracking only fires after consent.

Tested on the PR preview:
- [x] Sign in to the studio-staging preview, open any project page, and
find the `POST /platform/telemetry/feature-flags/track` request in
DevTools: expect the body to include `"platform":"studio"` and a 2xx
response (a 400 means the field was rejected). Observed
`{"feature_flag_name":"proBenefitWording","feature_flag_value":"variant-a","platform":"studio"}`
with a 201, and every `/platform/telemetry/feature-flags` GET returned
200.

## Linear
- fixes GROWTH-1461

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