[FE] Creator quest detail — reject UI + review states

[Kaylahray]

Description

Extend quest detail Response tab: reject with reason, clearer Pending/Approved/Rejected states. Approve may stay local/toast until Integration; reject must not be missing from UI.

User Story

As a Founder,
I want to approve or reject submissions in the UI,
so that I can finish a review pass without console hacks.

Requirements and Context

• Files: CreatorQuestDetail.tsx, useQuestData.ts, confirm dialog primitive
• Reject confirm + optional reason field
• Status badges for submission states
• Fixture OK until submissions API wired

Suggested Implementation

// ConfirmDialog for approve + reject
// Local state machine Pending → Approved | Rejected until BE/INT

Acceptance Criteria

• Reject flow in UI with confirm
• Approve/reject update visible status
• No silent console.log-only reject gap
• Works with fixture data

Submission Guidelines

• Branch: feat/fe-creator-review-reject
• Depends on: [FE] Shared UI primitives (ConfirmDialog) if present, else include dialog
• PR: feat(frontend): creator reject UI and review states