feat: add GET /api/chats/[id]/segment endpoint

[arpitgupta1214]

Summary

• add dedicated GET /api/chats/[id]/segment endpoint for chat-to-segment lookup
• add shared resolveAccessibleRoom utility for id validation, auth, and access checks
• add segment-room select helper under lib/supabase/segment_rooms
• return stable response shape: room_id, segment_id, segment_exists
• add focused unit tests for resolver and handler paths

Validation

• pnpm test lib/chats/__tests__/resolveAccessibleRoom.test.ts lib/chats/__tests__/getChatSegmentHandler.test.ts
• pnpm exec eslint "app/api/chats/[id]/segment/route.ts" lib/chats/getChatSegmentHandler.ts lib/chats/resolveAccessibleRoom.ts lib/chats/__tests__/resolveAccessibleRoom.test.ts lib/chats/__tests__/getChatSegmentHandler.test.ts lib/supabase/segment_rooms/selectSegmentRoomByRoomId.ts

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Project	Deployment	Actions	Updated (UTC)
recoup-api	Ready	Preview	Mar 30, 2026 9:14pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 782846ca-328b-47fb-b5ea-66814aeee3bd

📥 Commits

Reviewing files that changed from the base of the PR and between 54072ca and 58f8bb8.

⛔ Files ignored due to path filters (2)

• lib/chats/__tests__/getChatSegmentHandler.test.ts is excluded by !**/*.test.*, !**/__tests__/** and included by lib/**
• lib/chats/__tests__/validateChatAccess.test.ts is excluded by !**/*.test.*, !**/__tests__/** and included by lib/**

📒 Files selected for processing (4)

• app/api/chats/[id]/segment/route.ts
• lib/chats/getChatSegmentHandler.ts
• lib/chats/validateChatAccess.ts
• lib/supabase/segment_rooms/selectSegmentRoomByRoomId.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/arpit-chat-segment-endpoint

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