Add comprehensive quote management and UI improvements:
- Add `email_received_at` field to quotes collection, TypeScript types, and setup script
- Update quote attachments schema to mark `kind` optional for legacy attachments, add `uploaded_at` field, and improve documentation comments
- Create `/api/v1/users/lookup` server endpoint to resolve user IDs to display names
- Add stable user ID → color mapping for visual grouping of claimed quotes
- Enhance quotes list page: reorder tab filters, show claimer names, color-code rows per claimant
- Update quote detail page to display claimer info with user icon
- Expand DataTable component to support per-row custom class and style props
- Overhaul QuoteEmailCard: add proper HTML/plain text body sanitization/linkification, inline PDF/image previews, improved metadata display, and fixed auth-aware attachment previews via blob URLs
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