Fix swallowed trailing space in repo Display name field
The TextField sat directly inside a `.formStyle(.grouped)` Form, which
auto-applied LabeledContent rendering and forced trailing-aligned text
inside the field. Trailing spaces visually clipped against the right
edge, making typed spaces appear lost. Wrap the field in an explicit
HStack with a Name label and `.labelsHidden()` so Form leaves the
TextField's internal layout alone and the cursor moves leading-aligned
as expected.