fix(contacts): find direct chat when get_contact_chats is called with a username - #308

What changed

get_contact_chats compared dialog.entity.id == contact_id, where contact_id is the raw argument: for a username call it is a string, so the int-vs-str comparison was always False and the direct chat was never matched. The comparison now uses the resolved contact.id, mirroring get_direct_chat_by_contact (contacts.py:163).

Before

Contact Alice (id=999, @alice_smith) has an existing private chat:

get_contact_chats(contact_id="@alice_smith")
→ "No chats found with Alice Smith (ID: @alice_smith)."

get_contact_chats(contact_id=999)
→ {"results": [{"chat_id": 999, "type": "Private", ...}]}

Same contact: the username lookup reported nothing, the numeric lookup worked.

After

Same contact, same calls:

get_contact_chats(contact_id="@alice_smith")
→ {"results": [{"chat_id": 999, "type": "Private", "unread": 2}],
   "contact_name": "Alice Smith", "contact_id": "@alice_smith"}

get_contact_chats(contact_id=999)
→ {"results": [{"chat_id": 999, "type": "Private", ...}]}

Both forms now return the private chat; the numeric path is unchanged.

Tests

• New tests/test_contact_chats.py: direct chat found by @username (failed before) + numeric-id regression case.
• Full suite: uv run pytest -q → 1196 passed.

Fixes #297

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