* Fix critical bug causing subtasks to disappear when updating parent task
This fixes a serious bug where updating tags, priority, status, or due_date
on a parent task would inadvertently delete all its subtasks.
Root Cause:
1. Backend serializer returns `subtasks: []` when Subtasks association is not loaded
2. Frontend was spreading entire task object when updating, sending `subtasks: []`
3. Backend updateSubtasks() interpreted empty array as "delete all subtasks"
Solution:
Remove object spreading from updateTask calls. Only send the specific fields
being updated, not the entire task object.
Fixes the issue reported where assigning tags to a task caused subtasks to vanish.
Related: #TBD (GitHub issue to be created)
* fix: upgrade dependencies to resolve security vulnerabilities
- jest-environment-jsdom: 29.0.0 → 30.3.0
- nodemailer: 7.0.10 → 8.0.4
- sqlite3: 5.1.7 → 6.0.1
All npm audit vulnerabilities resolved (20 high/critical → 0).
Tests passing (1157 pass, 1 pre-existing failure unrelated to upgrades).
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