- Add scaling leader hire costs based on number of leaders already owned (costScalePerOwned: 0.5), making it progressively more expensive to hire multiple leaders and preventing cheap roster stockpiling
- Add leaderHireCost() function in VegaLogic.js to calculate scaled hire costs
- Add unassignLeader() function to allow removing leader assignments
- Update AI in VegaLeaders.js to use dynamic pricing when deciding to hire leaders
- Add research videos for ursaal, kkrix, and mekhan factions
- Enhance leader screen UI with:
- Dynamic cost display reflecting current scaling
- Fleet labeling showing ship composition and location
- Assign/Reassign buttons with list picker for colonies (admins) and fleets (captains)
- Unassign button for posted leaders
- Better location display for assigned leaders
