`dsh.title` was a manifest field this branch introduced: the manager read
it for `listBundles` and `inspect`, and the Web page showed it over the
package name. A bundle is named by its package name now, so `DshManifest`
keeps only its shipped fields, the page derives every heading from the
name, and the install dialog's subject line reads the name the Host
answered. The two e2e fixtures drop their titles and the manager lane's
goldens follow.