fixup: update stale CreateAgentPage cross-references (argus review)

Three doc comments elsewhere in the tree still named the old
CreateAgentPage identifier/page framing after the rename in this
branch -- TextField.tsx, Panel.tsx, FormField.css (x3). None of these
files are touched by the rest of the diff, which is exactly how the
staleness happened.

frontend/packages/swarm-ui/src/ui/form-field/FormField.css

@@ -3,7 +3,7 @@
    from (one class, so the two never drift). `width: 100%` fills
    whichever container the caller gives it — the kit itself has no
    opinion on a maximum width; a page that wants one narrower than its
-   own layout caps it at the layout level (`CreateAgentPage.css`'s
+   own layout caps it at the layout level (`CreateAgentForm.css`'s
    `.create-agent-form-col` is the existing example), same reasoning
    `Panel` has no width opinion of its own either. `min-height` is a
    touch-target floor (44px at the default 16px root font — WCAG
@@ -15,13 +15,13 @@
 
    The field wrapper repeats `.ui-form-control`'s own `width: 100%`
    rather than leaving the wrapper unconstrained: inside a shrink-to-fit
-   flex column (`CreateAgentPage`'s form is one), an unconstrained
+   flex column (`CreateAgentForm`'s form is one), an unconstrained
    wrapper sizes to its own content — and a `width: 100%` *control*
    inside an auto-width wrapper resolves against that shrunk width, not
    the container the page actually gave it, so two fields with
    differently-long labels ("agent name" vs "hive") ended up with
    differently-wide inputs — the misalignment mara reported on the
-   create-agent page. Matching the two declarations here means every
+   create-agent form. Matching the two declarations here means every
    field's control width is driven by the same container width
    regardless of its label's length or its siblings'. */
 .ui-form-field {