- Add centralized formatWidgetDate() helper that handles both yyyy-MM-dd and ISO8601 formats
- Update widget date display to show "Today", "in X days", or "X days ago"
- Fix isTaskOverdue() to parse ISO8601 dates from Go API
- Remove duplicate date formatting functions from widget views
- Switch API environment back to DEV
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Co-Authored-By: Claude <noreply@anthropic.com>
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