Multi-task daily logging, onboarding tour & dynamic accent color picker
WorklogsJira v2.7.0 introduces multi-task daily logging in a single batch with auto-save drafts, an interactive 5-step onboarding tour for new users, and customizable dynamic seed accent colors with Windows system color detection.

- Multi-task daily logging: log multiple Jira issues for a single day in one shot, with live hours summary and draft auto-save
- Onboarding tour on first launch (5-step coach marks); re-triggerable from the ? button in Settings
- Dynamic accent color: seed color picker next to the theme selector with 7 preset swatches, Windows system accent color detection, and a full custom color wheel
- ColorPickerButton extracted as a standalone widget (color_picker_button.dart)
- Last logged date calculation now accounts for repetitions and working-day skipping
- Theme and accent color changes apply instantly without requiring a save



