## Summary
### Fix 1: Autogrow input unclickable when value is empty string
- Fixes the last name input on the Person record show page being
unclickable on regular screens
### Fix 2: Surface nested migration errors in add-missing-system-fields
command
- `AddMissingSystemFieldsToStandardObjectsCommand` calls
`workspaceMigrationRunnerService.run()` directly and was re-throwing
`WorkspaceMigrationRunnerException` without reading its nested `errors`
- Extracted `getNestedErrorMessages()` helper (reused by both
`isUniqueViolationError` and `enrichErrorMessage`)
- Both catch sites now call `enrichErrorMessage()` before re-throwing,
appending nested error details to the message
**Before:**
```
ERROR [UpgradeCommand] Error in workspace ...: Migration action 'create' for 'fieldMetadata' failed
ERROR [UpgradeCommand] undefined
```
**After:**
```
ERROR [UpgradeCommand] Error in workspace ...: Migration action 'create' for 'fieldMetadata' failed (metadata: duplicate key value violates unique constraint "...")
```
## Test plan
- [x] Lint passes
- [x] Typecheck passes
- [x] Verify upgrade command errors now include nested error details
- [x] Verify autogrow input is clickable when value is empty string
