## Summary
When messages are imported, Twenty auto-creates a Person record for any
recipient that doesn't exist yet. The display-name parser used at that
point is `displayName.split(' ')[0] / [1]`, which silently mangles
several common header shapes:
| Header | Old result |
|-------------------------------------------------|-----------------------------------------|
| `"Doe, John" <...>` | `firstName="Doe,"`, `lastName="John"` |
| `"John.Doe Doe" <...>` | `firstName="John.Doe"`, `lastName="Doe"`|
| `"Mary Jane Watson" <...>` | `lastName="Jane"` ("Watson" dropped) |
| `"john.doe@x.com" <john.doe@x.com>` (forwarder) | full address in
`firstName` |
| `"Doe, John:GROUP" <...>` (group-tag servers) |
`firstName="John:GROUP"` |
This PR rewrites `getFirstNameAndLastNameFromHandleAndDisplayName` to
handle each pattern. Behaviour in order:
1. Trim + strip wrapping quotes
2. Swap `"Last, First"` comma form
3. Fall back to handle parsing when display name contains `@` (real
names don't)
4. Split single dotted tokens (`"john.doe"` → `"John"`, `"Doe"`)
5. Preserve multi-word last names (`tokens.slice(1).join(' ')`)
6. De-synthesize dot-glued first names (`"John.Doe Doe"` → `"John"`,
`"Doe"`)
7. Strip `:XXX` trailing tag suffix from each parsed field
## Test plan
- [x] 16 new unit test cases covering each shape
(`__tests__/get-first-name-and-last-name-from-handle-and-display-name.util.spec.ts`)
- [x] Lint + typecheck clean
- [ ] No regression in the messaging import flow
---------
Co-authored-by: neo773 <62795688+neo773@users.noreply.github.com>
Co-authored-by: neo773 <neo773@protonmail.com>
