Implement optimistic UI updates for quest actions and claims

[RUKAYAT-CODER]

Background

Actions wait for full server round-trips before reflecting in the UI, feeling sluggish.

Implementation Plan

• Apply optimistic updates with rollback on failure
• Measure before/after with Lighthouse/React Profiler/bundle analyzer as appropriate
• Add regression tests where applicable
• Document the change

Acceptance Criteria

• Measurable performance/efficiency improvement demonstrated with before/after numbers
• No regression in existing functionality
• Tests pass and code follows project standards
• Change is documented

[Aisha-hub11]

Hello Maintainer, I'd like to work on this issue. I have experience with backend development and state management, and I can implement this. Please consider assigning it to me.

[mijinummi]

Hello maintainers I'm a full stack developer experience in building scalable systems I can handle this

[grantfox-oss]

🦊 GrantFox — @mijinummi has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #2055)
2. Your PR will be reviewed by the EarnQuestOne maintainers

Good luck! Track your progress on GrantFox.