New module packages/core/src/random.ts with randomHex, randomInt,
randomIndex — centralizes all crypto-based randomness.
Replaces:
- Date.now() IDs in VariablesDialog (not unique, not random)
- Hand-rolled hex token in automation/server.ts
- Inline crypto.getRandomValues in clipboard.ts, use-collab.ts
Also adds --color-component Tailwind theme color (#9747ff) and
replaces all 6 hardcoded occurrences across DesignPanel, LayerTree,
NodeContextMenuContent, and menu.ts.
8d7dd0a36b