CloudAgent - Unify cloud-next routes into cloud with feature flag gating

[eshurakov]

Summary

• Removes separate /cloud-next routes and sidebar entries, consolidating everything under /cloud
• Gates the sessions list page behind a cloud-agent-next feature flag (always enabled in development)
• Routes the chat page to old vs new UI based on session ID prefix (ses_ = next-gen)
• Deletes the now-unused CloudSessionsPage component from cloud-agent-next/
• Fixes incorrect callbackPath in the organization cloud page that was redirecting to /cloud instead of /organizations/<id>/cloud after sign-in

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

This PR cleanly consolidates the /cloud-next routes into the existing /cloud routes. The approach is well-structured:

• Sessions pages (/cloud, /organizations/[id]/cloud) use a feature flag (cloud-agent-next) + dev-mode check to decide between old and new sessions UI
• Chat pages (/cloud/chat, /organizations/[id]/cloud/chat) use isNewSession(sessionId) (checking ses_ prefix) to route between old (CloudChatPageWrapper) and new (CloudChatPageWrapperNext) chat wrappers
• Sidebar entries for "Cloud Next" are removed
• All internal navigation paths updated from /cloud-next to /cloud
• The large duplicate CloudSessionsPage.tsx (1030 lines) in cloud-agent-next is deleted

Files Reviewed (14 files)

• src/lib/cloud-agent/session-type.ts (new) - Session type discriminator
• src/app/(app)/cloud/chat/page.tsx - Added auth + session routing
• src/app/(app)/cloud/chat/CloudChatPageWrapperNext.tsx (renamed) - Wrapper for next chat
• src/app/(app)/cloud/page.tsx - Feature flag routing
• src/app/(app)/organizations/[id]/cloud/chat/page.tsx - Added session routing
• src/app/(app)/organizations/[id]/cloud/chat/CloudChatPageWrapperNext.tsx (renamed) - Org wrapper for next chat
• src/app/(app)/organizations/[id]/cloud/page.tsx - Feature flag routing for orgs
• src/app/(app)/components/PersonalAppSidebar.tsx - Removed Cloud Next sidebar entry
• src/app/(app)/components/OrganizationAppSidebar.tsx - Removed Cloud Next sidebar entry
• src/components/cloud-agent-next/ChatSidebar.tsx - Path update
• src/components/cloud-agent-next/CloudChatContainer.tsx - Path updates
• src/components/cloud-agent-next/CloudNextSessionsPage.tsx - Path updates + title change
• src/components/cloud-agent-next/SessionsList.tsx - Path update
• src/components/cloud-agent-next/hooks/useSessionDeletion.ts - Path update
• Deleted: src/app/(app)/cloud-next/ pages, src/app/(app)/organizations/[id]/cloud-next/ pages, src/components/cloud-agent-next/CloudSessionsPage.tsx