feat(slots): thread rescheduledBy param from URL through to tRPC input

[bcornish1797]

Second of three PRs splitting #28636.

Threads a new rescheduledBy URL param through useScheduleForEvent, useSchedule, and the tRPC getSchedule input. Nothing consumes it yet; Part C (#28911) reads it to decide whether a reschedule is host-initiated. Small additive change, backwards compatible at both the URL and schema levels (nullish).

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[coderabbitai]

📝 Walkthrough

Walkthrough

This change adds support for a rescheduledBy query-string parameter throughout the schedule management system. The parameter is extracted in the useEvent hook, forwarded to the useSchedule hook, and propagated through the API request input to the backend. The getScheduleSchemaObject Zod schema is updated to validate and include the new optional rescheduledBy field, extending the type definitions used by the schedule retrieval logic.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: threading the rescheduledBy parameter from URL through frontend hooks to tRPC input schema.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description clearly relates to the changeset, explaining the purpose of threading a rescheduledBy parameter through the codebase as part of a three-part feature series.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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