Lucas Berger
a99ef1daae
The displayName claim-preference logic (name → preferred_username → email → sub fallback) was duplicated verbatim in me.ts and events.ts resolveUserId. Extract it to auth/user.ts as deriveDisplayName and use it in both call sites, so the rule has one definition. Update the events.test.ts user.js mock to keep the real helper (spread importActual) while stubbing only upsertUser.
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