Release v1.2.0: Multi-target Label Removal/Cleanup Feat

Feature

• Remove all labels from target repos with single click
• Keep defaults mode - remove all except standard labels (bug, feature, documentation, enhancement, good first issue..)
• Independent cleanup workflow - doesn't require source repo
• Multi-target cleanup with parallel processing
• Per-repo progress tracking and removal statistics
• Destructive operation requires explicit selection for safety
• Same localStorage PAT support as sync feature
• Comprehensive error handling and logging per repository"