The create page's flavor dialog posted its forms the normal way, and the
server sent a fresh page back: the VM's name, sizes, disk choices and MAC
edits were lost, and a refused flavor left the page for a bare form.
The dialog's forms are now posted from the page. The flavor views answer
such a post with the presets and the dialog body, rendered from the same
includes as the page, and the script swaps them in: a refused flavor shows
its errors in the dialog, and the focus stays in it. A post without the
script, or one whose request fails, still goes the normal way.
Fixes#173
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
