feat(web): add date picker and provider table

[silent-cipher]

Summary

Adds a new Providers Table to the NewLanding page that displays storage provider metrics (storage success rate, data retention fault rate, retrieval success rate) with configurable time window filtering. Introduces shared infrastructure for data fetching, schema validation, and date/preset selection.

Key Changes

• Providers Table

  • New providers metrics table built with tanstack/react-table
  • Color-coded cells for success/fault rates and samples based on acceptance criteria
  • Manual Approved badge support for providers

• Time Window Selection

  • Shared time window selector with presets (1h–90d, All Time) and custom date ranges
  • Centralized time window utilities for presets, labels, and URL serialization

• Data Fetching & Validation

  • useProvidersQuery hook using tanstack/react-query with preset and range support
  • Runtime API response validation via Zod
  • Query client configured with sensible caching defaults

• Mocking & Dev Experience

  • MSW setup for frontend development without a backend
  • Mock handlers and fixtures added

• UI Updates

  • Added shadcn/ui table component
  • Improved calendar range selection styling and locale support

closes #214

[BigLep]

Thanks for sharing @silent-cipher. Given the current downscoping of the dealbot in #239, I assume this PR isn't needed at the moment but can be picked back up if/when we prioritize #214 in the future.