v1.5.0 - Daily Launch Groups and Time Zones

1. Daily Launch Groups - Grouped launches by day with sticky labels for Today, Tomorrow, weekdays, and dates.
2. Loading Skeletons - Added placeholder cards while launch data loads.
3. Time Zone Toggle - Added a Local / UTC toggle that remembers your preference.
4. Live Time Zone Updates - Made the toggle update the hero, launch list, and currently open detail view.
5. Sync Status - Added a footer indicator showing when the data was last updated.
6. Automatic Refresh - Added automatic data refresh every 5 minutes.
7. Unified Date Formatting - Routed date and time formatting through a single time zone-aware helper.

Published - v1.5.0 is now available on GitHub.