perf: Remove unused dependencies and fix trading terminal theme colors

Dependency cleanup (saves ~300MB in node_modules):
- Remove three.js and react-force-graph-* (GPU graph was disabled)
- Remove swagger-ui-react (not imported anywhere)
- Move puppeteer packages to devDependencies (only used in scripts)
- Remove @types/three

Trading terminal improvements:
- Create reusable DataSourceIndicator component
- Create reusable ConnectionStatusIndicator component
- Replace all hardcoded colors with theme-aware semantic tokens
- Remove void focusedTile suppression
- Replace alert() with toast notification

Files affected:
- 14 trading terminal components updated
- 7 test/mock files removed
- GPUAcceleratedForceGraph removed (unused)
- package.json dependencies cleaned up

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade