Regression: :kbd: in Sphinx 8.2

Describe the bug

For this reStructuredText:

:kbd:`Control-x`

Sphinx < 8.2 produces these doctree elements (pseudoXML):

<literal classes="kbd">
    Control-x

Since Sphinx 8.2, the following is produced:

<literal classes="kbd">
    Control
-
<literal classes="kbd">
    x

The result is that the hyphen cannot be styled properly, as it is not indicated to be related to the keyboard shortcut. Perhaps the entire shortcut could be wrapped in an inline block with a particular class?

How to Reproduce

N/A

Environment Information

Platform:              darwin; (macOS-15.6.1-arm64-arm-64bit-Mach-O)
Python version:        3.13.7 (main, Aug 23 2025, 23:13:28) [Clang 17.0.0 (clang-1700.0.13.5)])
Python implementation: CPython
Sphinx version:        8.2.3
Docutils version:      0.20.1
Jinja2 version:        3.1.4
Pygments version:      2.18.0

Sphinx extensions

Additional context

No response

Start by reproducing the provided :kbd:Control-x`` input with Sphinx 8.2.3 and inspect the generated pseudoXML for the inline elements. Trace the kbd role handling, then add a regression test showing that the shortcut and its hyphen remain grouped and styled as one keyboard sequence.