feat(frontend): intial layout and home page

[bayulaksana479]

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[Copilot]

Pull request overview

This pull request introduces initial layout and frontend components along with comprehensive schema updates for the NEAR blockchain explorer. The PR establishes a foundation for various blockchain data queries including transactions, tokens (FTs/NFTs), statistics, and search functionality.

Key Changes

• Schema Enhancements: Complete schema definitions for FTs, NFTs, stats, keys, search, and multichain operations
• API Standardization: Unified pagination pattern using next and prev cursors instead of after_ts/before_ts and single cursor
• New Dependencies: Addition of UI libraries (Radix UI v19+, Tailwind CSS v4, React v19) and blockchain tooling

Reviewed changes

Copilot reviewed 200 out of 206 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
yarn.lock	Adds 100+ new dependencies for frontend UI components, React 19, Tailwind CSS 4, and various utility libraries
packages/nb-schemas/src/txns/*	Refactors transaction schemas, adds FT/NFT event support, standardizes cursor pagination
packages/nb-schemas/src/stats/*	New schema for network statistics (daily stats, TPS, market data)
packages/nb-schemas/src/search/*	New unified search schema across accounts, blocks, transactions, tokens, and keys
packages/nb-schemas/src/nfts/*	Complete NFT schema including tokens, contracts, holders, and transaction events
packages/nb-schemas/src/fts/*	Complete FT schema with market data, contracts, holders, and transaction events
packages/nb-schemas/src/keys/*	New schema for access key management with creation/deletion tracking
packages/nb-schemas/src/multichain/*	Updates multichain transaction types and pagination
packages/nb-schemas/src/blocks/*	Standardizes block query pagination
packages/nb-schemas/src/common.ts	Updates response metadata from single cursor to next_page/prev_page
apps/frontend/src/components/layout/notice.tsx	Empty placeholder file for future notice component

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