fix(ui): center the home empty-state wizard (#10691)

The no-models getting-started wizard (`.home-wizard`) rendered
left-aligned instead of centered. `.home-page` is a column flexbox with
the default `align-items: stretch`; a child with `max-width: 48rem`
cannot be stretched past its max-width, so it falls back to the
cross-start (left) edge. The populated home branch never exposed this
because its children are full-width.

Add `margin: 0 auto` to `.home-wizard` so the max-width block centers
horizontally, for both the admin getting-started wizard and the
non-admin no-models hero.

Assisted-by: Claude:claude-opus-4-8 [Claude Code]

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

Author: localai-bot

core/http/react-ui/src/App.css

@@ -6304,6 +6304,9 @@ select.input {
 .home-wizard {
   max-width: 48rem;
   width: 100%;
+  /* .home-page is a stretch column flex; a max-width child would otherwise
+     pin to the left cross-start edge. Center it. */
+  margin: 0 auto;
 }
 .home-wizard-hero {
   text-align: center;