Incorrect Sorting Order for Dialog Groups

[seanes]

Description of the bug

Dialogs are sorted by updated_at in descending order (DESC). If they belong to the same month or year, they are grouped and sorted internally in descending order by updated_at, which works as expected.

However, the year groups themselves (e.g., 2023, 2024, 2025) are currently sorted in ascending order (ASC). This results in older years appearing first, requiring unnecessary scrolling to reach the most recent messages.

Steps To Reproduce

1. Log in to the test environment with 08847698382.
2. Select the inbox for Etterpåklok Kjær Tiger AS.
3. Observe that while messages within each group are correctly sorted in DESC order, the year groups themselves are sorted in ASC order.

Expected behavoir

Year groups should be sorted in descending order (DESC) so that the newest messages (e.g., 2025) appear first, followed by 2024, 2023, etc.

Additional Information

No response