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docs: document two shipped form capabilities; finish the forms conventions (#931)

* docs: document two shipped form capabilities; finish the forms conventions

Two things the build supports and the pages never mentioned, found
comparing the section against upstream and verified against the
compiled CSS before writing:

- Floating labels inside input groups. The rules exist
  (.input-group > .form-floating and the border-radius handling around
  it) but the page lost the section somewhere along the way. Restored
  with our label-first markup, including the validation shape — group
  wrapped in a .form-field with the feedback outside the frame.
- The overhead label on a form field. .form-field > .form-label spans
  both grid columns (grid-column: 1/-1) so a check, radio or switch can
  carry a title above the control — shipped, never documented. The
  field page gains the section in our idiom (no .form-field-content;
  that wrapper is upstream's, absent from our build).

The validation page was the last forms page closing with "## Sass"
(audit §0.1): renamed to "## Customizing" with the canonical subsection
names and order — variables, maps, mixins, loops; nothing linked the
old anchors.

The stepper examples carried class="stepper-content" on the pane
wrapper — a class neither the stylesheet nor the plugin knows (panes
are found by .stepper-pane anywhere inside .stepper). The phantom class
is gone; the wrapper stays.

* docs: drop has-validation from the floating-label validation example

The class switches the input group's corner-squaring to
:nth-last-child(n+3), because it exists for feedback sitting inside the
group as its last child. This example places the feedback outside the
group (in the .form-field), so the selector matched nothing and the
text addon rendered fully rounded. The prose now says why the class
does not belong in this shape; measured on the built page, the addon's
right corners are square again (6px/0/0/6px).

* docs: drop the ha... (continued)

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