fix: habit updates losing data due to partial API updates

[kozy-codes]

Problem

Habit check-ins and updates were disappearing after being recorded. For example, checking into a habit would initially show success, but the check-in would vanish shortly after.

Root Cause

TickTick's habits/batch API requires full object replacement, not partial updates. When only some fields are sent in an update request, the omitted fields are reset to their default values (null/0).

This means:

• Checking in a habit would reset other fields like name, color, goal, etc.
• Archiving/unarchiving would lose check-in history
• Any habit update would potentially corrupt other habit data

Solution

Modified all habit update operations to:

1. Fetch the complete original habit first
2. Merge the new values with all original values
3. Send the complete object back to the API

Changes

src/ticktick_sdk/api/v2/client.py

• Added missing parameters to update_habit():

  • sort_order
  • target_start_date
  • completed_cycles
  • ex_dates
  • style
  • etag
  • created_time

• Added new method full_update_habit(habit_data: dict) for sending complete habit dictionaries directly to the batch API

src/ticktick_sdk/unified/api.py

Updated the following methods to fetch original habit and send all fields:

• update_habit() - Now preserves all original fields when updating specific properties
• checkin_habit() - Uses full_update_habit() with complete Habit object converted via to_v2_dict()
• archive_habit() - Sends all fields with status=2
• unarchive_habit() - Sends all fields with status=0
• batch_checkin_habits() - Uses full_update_habit() for each habit update

Testing

1. Check in to a habit
2. Verify the check-in persists (refresh/re-fetch)
3. Check in again and verify total increments correctly
4. Archive and unarchive a habit, verify all data preserved