#259 fix(github): guard against null nodes in ProjectV2 GraphQL response

[Anonymous]

Originally created by: adityaharishch

Summary

• ProjectV2ItemConnection.nodes and UserConnection.nodes are typed [T] in GitHub's GraphQL schema — both the list and individual elements can be null
• The Rust structs had them as Vec<T> (non-optional elements), so a null element would cause a serde deserialization failure and silently drop the entire project's tasks
• Changed both to Vec<Option<T>> and added .flatten() at the two iteration sites

Test plan

• [ ] Verify cargo clippy passes (no warnings)
• [ ] Trigger a GitHub sync and confirm tasks from all configured projects are fetched correctly
• [ ] Confirm behaviour is unchanged when no null elements are present (normal case)

🤖 Generated with Claude Code

[Anonymous]

Originally posted by: Akarsh-Hegde

Superseded by [#257]

[Anonymous]

Ticket changed by: Akarsh-Hegde

• status: open --> closed