API key names longer than 32 characters were rejected by better-auth
with a 400 that surfaced as an opaque INTERNAL_SERVER_ERROR (the generic
"Failed to generate API key" toast). Add a shared name schema (min 1,
max 32, matching better-auth's default maximumNameLength) used by both
the tRPC input and the client form, and surface the limit on the Name
field so users see it before submitting.
Fixes#4798
