Relates to:
https://community.vikunja.io/t/reordering-not-possible-position-value-the-same-for-different-tasks/4078
Duplicate positions can occur due to race conditions or historical bugs, causing tasks to appear in the wrong order or jump around when the page is refreshed.
This change adds a `repair-task-positions` CLI command to detect and resolve task position conflicts, with dry-run preview option.
Also implemented automatic conflict detection and resolution to ensure
unique task positions.
🐰 Positions once conflicted, clustered tight,
But now we nudge them back into the light!
MinSpacing guards precision from decay,
While conflicts heal and duplicates give way. ✨
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