feat(cli): iln submit interactive, cancel, marketplace, fund, and status rich output

[Jaydbrown]

Closes #233

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Closes #231

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Closes #230

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Closes #229

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Summary

• Implement iln submit command with interactive prompts #229 — iln submit interactive prompts: Refactored submit.ts to support both flag-based (--payer, --amount, --token, --rate, --due) and interactive (@inquirer/prompts wizard) modes. Added --dry-run flag that serialises the transaction payload as JSON without signing. Prints a receipt table on success. Both modes are injection-testable via makeSubmitCommand(prompter, submitter).

• Implement iln cancel command #233 — iln cancel: New cancel.ts command that fetches the invoice, guards against non-Pending state, shows a confirmation prompt ("Cancel Invoice #X (100 USDC, due 2025-12-31)? This cannot be undone. [y/N]"), and prints the TX hash on success. --yes skips the prompt for scripting.

• Implement iln fund command with marketplace listing #230 — iln marketplace + iln fund confirm: New marketplace.ts command lists Pending invoices in a terminal table with --sort yield|amount|due and --filter token=USDC flags. Updated fund.ts adds a confirmation prompt ("Fund invoice #X (500 USDC, 3.2% yield)? [y/N]") with --yes to skip.

• Implement iln status command with rich output #231 — iln status rich output: Refactored status.ts to display a full invoice summary (ID, colour-coded state badge, submitter, payer, LP, token, amount, discount rate, effective yield, due date, time-to-expiry countdown, mini status timeline). --json outputs raw JSON for piping; --watch polls every 10 seconds until a terminal state (Paid, Cancelled, Expired) is reached.

Test plan

• iln submit --payer G... --amount 100 --token USDC --rate 300 --due 2025-12-31 prints receipt table with invoice ID and TX hash
• iln submit --dry-run prints JSON payload and exits cleanly without calling the submitter
• iln submit (no flags) calls the prompter wizard and passes answers to the submitter
• iln cancel --id X on a Pending invoice shows confirm prompt; y cancels, n aborts cleanly
• iln cancel --id X on a Funded/Paid invoice prints an error and exits 1
• iln cancel --id X --yes skips the prompt and cancels immediately
• iln marketplace prints a table of Pending invoices sorted by yield descending
• iln marketplace --sort amount sorts by amount descending
• iln marketplace --filter token=USDC shows only USDC invoices
• iln fund --id X shows confirmation with amount, token, and yield; y funds, n aborts
• iln fund --id X --yes skips confirmation
• iln status --id X prints full detail table and timeline
• iln status --id X --json outputs valid parseable JSON with all fields
• iln status --id X --watch polls every 10 s and stops when state reaches Paid/Cancelled/Expired

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