Adds a 5-level scaling system to all cards with progressively increasing stats and skill values. Introduces a campaign structure with unlock conditions, level requirements, and completion rewards that grant new cards and player level-ups.
Key changes:
- Refactored `data/cards.json` to use a `levels` array for stat progression
- Added `data/campaigns.json` defining 5 faction campaigns with mission lists and rewards
- Updated `CardManager.createInstance()` to accept a level parameter and resolve stats accordingly
- Implemented save migration (v1→v2) to track player level and unlocked campaigns
- Added `CampaignSelectScene` for browsing unlocked campaigns by faction/level
- Added `SkirmishSetupScene` allowing players to choose card levels for skirmishes
- Enhanced combat engine to pass level data to both player and AI decks
- Implemented visual animations for new skills: `enfeeble` (ATK reduction) and `jam` (skill suppression) with floating text feedback
- Updated UI components (Collection, Deck Builder, Store, Fusion) to display Level 1 stats by default
