TickTick CSV exports don't guarantee parent tasks appear before their
subtasks. When a child row came first, the shared migration pipeline
tried to create a title-less placeholder for the missing parent, which
failed with 'Task title cannot be empty'.
Resolvesgo-vikunja/vikunja#2487
TickTick uses status "2" (Archived) for completed tasks that were
subsequently archived. The import only checked for status "1"
(Completed), causing archived tasks to be imported as open despite
having a completion timestamp.
Closesgo-vikunja/vikunja#2278
This change fixes a few issues with the TickTick import:
1. BOM (Byte Order Mark) Handling: Added stripBOM() function to properly handle UTF-8 BOM at the beginning of CSV files
2. Multi-line Status Section: Updated header detection to handle the multi-line status description in real TickTick exports
3. CSV Parser Configuration: Made the CSV parser more lenient with variable field counts and quote handling
4. Test Infrastructure: Added missing logger initialization for tests
5. Field Mapping: Fixed the core issue where CSV fields weren't being mapped to struct fields correctly
The main problem was in the newLineSkipDecoder function where:
- Header detection calculated line skip count on BOM-stripped content
- CSV decoder was also stripping BOM and applying the same skip count
- This caused inconsistent positioning and empty field mapping
Rewrote the decoder to use a scanner-based approach with consistent BOM handling.
Resolves https://github.com/go-vikunja/vikunja/issues/1870
