Solana Academy — Nonce and Claim Replay Tabletop 01

Open nonce-claim-replay-tabletop.html in a current browser. Keep the HTML,
CSS, and JavaScript files together. The exercise works offline; official
references need internet access. All incidents and identifiers are fictional.
It uses no RPC, wallet, key, account, or chain connection and saves no answers.

This is formative practice, not a scored course exam or a live transaction
simulator. A client timeout alone does not prove that a transaction failed.
Reconcile the exact signature, nonce state, fee evidence, application receipt,
network, commitment, provider, and observation time before a retry.
