feat(contract): add no-show timeout refund flow

[Chucks1093]

Summary

• add claim_no_show_refund(seeker, session_id) to support seeker refunds when expert no-shows
• enforce eligibility checks: seeker-only caller, active session, timeout passed (10 minutes), and no settlement activity
• transfer full remaining escrow back to seeker and mark session completed
• emit a dedicated no-show refund event for indexer visibility
• add tests for successful timeout refund and pre-timeout rejection

Validation

• cargo test -q (blocked by existing unrelated compile/type errors already present in repository)

Closes #166
Closes #168
Closes #169
Closes #170

Summary by CodeRabbit

• New Features

  • Added no-show refund claim functionality that allows session seekers to claim full refunds if sessions remain unused within a 10-minute grace period following the scheduled start time, provided no streaming activity has occurred.

• Bug Fixes

  • Fixed minor formatting issue in the codebase.

• Tests

  • Added comprehensive unit tests covering refund claim scenarios and edge cases.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d20793b3-f033-4561-b463-c4021b0e1acf

📥 Commits

Reviewing files that changed from the base of the PR and between 005d459 and e57103c.

📒 Files selected for processing (1)

• contracts/src/lib.rs

---

📝 Walkthrough

Walkthrough

Adds a new claim_no_show_refund public method to the contract that enables session seekers to claim full refunds from sessions where experts failed to join within a 10-minute timeout window. The method validates session state, timing constraints, and no-streaming conditions before processing the refund transfer, updating session status, and emitting an event.

Changes

Cohort / File(s)	Summary
Session No-Show Refund contracts/src/lib.rs	Added claim_no_show_refund public method with 10-minute timeout validation, balance transfer to seeker, session completion logic, and event emission. Includes two unit tests covering successful post-timeout refund and pre-timeout failure scenarios. Fixed missing trailing newline.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Possibly related PRs

• feat: implement session streaming escrow lifecycle #111 — Introduces session streaming lifecycle state management that claim_no_show_refund directly relies on for balance and accrued funds validation.
• Implement Expert Registry, Encrypted Notes, and Active Status #150 — Modifies Session struct layout and session lifecycle initialization that the new no-show refund logic depends on for state and timestamp fields.
• feat: implement core smart contract features #167 — Implements withdraw_accrued behavior and settlement timestamp logic that the no-show refund mechanism uses for determining whether streaming has occurred.

Poem

🐰 A seeker sits alone, no expert shows,
Ten minutes pass, the silence grows,
But fear not! A refund flows back fast,
No more waiting, balance restored at last! 💸
The expert's absence? Now it's their loss,
Fair is fair, or so sayeth the boss! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}