Add-collaborator flow broken end-to-end (client {email} vs server {userId})

[Alimedhat000]

Problem

The invite flow is half-built and its two halves disagree:

• Client posts { email } (client/src/hooks/useCollaborators.ts:41)
• Server destructures { userId, permission } (server/src/controllers/document.controller.ts:827) → Prisma crash / 500
• The email input UI is commented out (collaborators-dropdown.tsx:81-96), hiding the breakage

No lookup-by-email endpoint exists server-side.

Related: #10 (dropdown functionality gaps).

Fix

Decide the contract — either an owner-facing lookup endpoint resolving email → userId, or accept email server-side — then restore the UI and cover it with a test.

[Alimedhat000]

✅ Resolved by PR #80 (fix(collab): accept email when adding collaborators), merged to main via #87.

Verified on main:

• Server accepts { email } with Zod validation (addCollaborator.schema.ts)
• Email lookup implemented in document.controller.ts (404 on unknown email)
• Add-by-email UI restored in collaborators-dropdown.tsx
• Covered by tests: default permission, case-insensitivity, unknown email 404, duplicate 409, P2002 race