Cannot modify `due` correctly

[riodelphino]

Describe the bug
When I edit a task, I cannot modify the existing due field correctly.

To Reproduce
Steps to reproduce the behavior:

1. Add new task
2. Set title as test
3. Set due as 2026-05-05 18:00
4. Remain other fields as default
5. ctrl+s to save it
6. Hit e key to check and edit the task
7. The due field displays 2026-05-05 05:05 (The hour & minute are wrong)

Expected Behaviour
7. The due field displays 2026-05-05 18:00

Screenshots

Environment (please complete the following information):

• OS: macOS Sequoia
• Kairo Version: 1.5.0
• Go Version: go1.26.1 darwin/amd64

Additional context
When yyyy-MM-dd is 2026-05-05, The time is overwritten by 05:05.
When yyyy-MM-dd is 2026-06-10, The time is overwritten by 06:10.
So the code might mistake MM-dd as hh:mm.

[programmersd21]

will work on that, adding to 1.5.1 milestone.