feat(design-tokens): generate platform token files (CSS, TS, Kotlin, Swift)
Updated generator to match existing MindLyst conventions:
- Kotlin: SCREAMING_SNAKE_CASE, Palette/Dark/Light/BrainGradient/Typography/Motion/Layout
- Swift: Color(hex: UInt), dark/light prefixes, Gradient(colors:), MindLystMotion, Color ext
- CSS: [data-theme] selectors, --ml-fs-*, --ml-elevation-*, --ml-motion-*, light theme
Generated 4 files:
- generated/tokens.css — CSS custom properties (dark + light themes)
- generated/tokens.ts — Full token tree as const
- generated/MindLystTokens.kt — KMP shared module (drop-in for existing)
- generated/MindLystTheme.swift — SwiftUI structs (drop-in for existing)
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