feat: Add blockchain information display and NFT data handling

[koofree]

Overview

This PR contains the following change(s):

• Added blockchain information display for NFT assertions: Implements support for displaying blockchain transaction details from the c2pa.nft assertion in the Content Credentials verification UI
• External blockchain explorer links: Users can now click "View on Explorer" to navigate directly to the blockchain transaction on the external explorer
• Multi-language support: Added translations for blockchain-related UI elements across all 21 supported languages

Key Features

• Extracts and displays NFT information including:
  • Token ID
  • Blockchain network name and type (mainnet/testnet)
  • Transaction hash (truncated for display)
  • Direct link to blockchain explorer
• Handles both standard c2pa.nft assertions and indexed variants (e.g., c2pa.nft__1)

Technical Implementation

Files Changed

• src/lib/selectors/nftInfo.ts - New selector to extract NFT data from C2PA manifest assertions
• src/lib/selectors/nftInfo.spec.ts - Comprehensive unit tests for NFT selector
• src/routes/verify/components/DetailedInfo/ProcessSection/BlockchainSection.svelte - New component for displaying blockchain information
• src/routes/verify/components/DetailedInfo/ProcessSection/ProcessSection.svelte - Integration of blockchain section
• src/lib/asset.ts - Added NFT info to manifest data structure
• locales/*.json - Added translations for all 21 language files

Assertion Structure Support

{
  "label": "c2pa.nft",
  "data": {
    "token_id": "9",
    "blockchain": {
      "name": "firmachain",
      "network": "testnet",
      "chain_id": 1337
    },
    "explorer_url": "https://explorer-testnet.firmachain.dev/transactions/...",
    "transaction_hash": "488714A76188BCE587697FD7E27A3EAD2F1BCDF2E47D9E30B6A1C5B6784CA4FA"
  }
}

Checklist

• End-to-end or unit tests (where applicable) have been added that cover this change/bug fix
• Any UI changes display properly on mobile breakpoints
• Any user-visible strings have accompanying translation tags
• Accessibility support has been added
• Analytics are being sent (where applicable)

Issue link (optional)

• Feature Request: Display External Verification Links in Process Section #311

[koofree]

This update is written to help you understand how to add this to the tool. But, I know it needs to consider the standard documents before this happens for sure.