[WIP] Add visual indicator for nonce value and timestamp

[Copilot]

• Understand the repository structure and existing stats cards
• Add visual indicator below the second stats-card (Claudex) showing nonce value and timestamp
• Ensure the indicator includes text like nonce=<value> for automated updates
• Place indicator between closing tag and
  tag
• Add HTML comment markers (NONCE-START and NONCE-END) around the indicator
• Test that the changes render correctly in markdown
• Verify the format works with the existing GitHub Action

Original prompt

the previous PR was merged in and it works as expected - can you add a visual indicator below the second "stats-card" (the one with the nonce) which shows (i) the current nonce value; (ii) the timestamp that the nonce was last changed - you should probably insert these elements below the card but before the "NONCE-END" closing comment (if the indicator includes the text nonce= then the existing action will already work to update it.

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