Pull Request Overview

Adds support for a resale origin on gifts and introduces a new next_transfer_date field across gift-related models.

Extend UniqueGiftInfoOrigin with RESALE and add corresponding fields (last_resale_star_count, next_transfer_date)
Update UniqueGiftInfo, OwnedGiftUnique, and related JSON (de)serialization to handle the new fields
Enhance tests to cover the new fields and enum conversion

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

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File	Description
tests/test_uniquegift.py	Added assertions for `last_resale_star_count` and `next_transfer_date`, plus an enum type test
tests/test_ownedgift.py	Added `next_transfer_date` assertions and removed unused import
src/telegram/constants.py	Introduced `RESALE` in `UniqueGiftInfoOrigin`
src/telegram/_uniquegift.py	Added `last_resale_star_count` & `next_transfer_date` handling
src/telegram/_ownedgift.py	Added `next_transfer_date` handling for `OwnedGiftUnique`

Comments suppressed due to low confidence (2)

src/telegram/constants.py:3215

[nitpick] Consider adding a period at the end of this docstring description for consistency with other enum entries.

    """:obj:`str` gift bought from other users

tests/test_uniquegift.py:390

Add a dedicated test case for the RESALE origin to verify last_resale_star_count is parsed and serialized correctly when origin is RESALE.

        last_resale_star_count=UniqueGiftInfoTestBase.last_resale_star_count,