fix(ts): preserve EventType literal inference under TS 5.4

[Hritwik001]

Context

Under TypeScript 5.4, chained Zod transforms can widen the \EventType\ literal union to \string.

Fix

• Defined \EVENT_TYPES\ as a readonly tuple and derived \EventType.
• Used \z.enum(EVENT_TYPES)\ for the \ ype\ field.
• No runtime behavior change.

Scope

• Change is isolated to \pps/web/lib/analytics/get-events.ts.

Notes

• Local monorepo typechecks show unrelated UI typing noise, but this change is self-contained and verified locally.

Summary by CodeRabbit

• Refactor

  • Strengthened event type validation for analytics tracking with standardized event categories.
  • Enhanced data filtering to ensure higher quality event records.
  • Improved code structure and maintainability for analytics processing.

  Fixes #3059