The router, the sidebar, the page titles and the command palette each kept
their own list of the panel's pages, so a page added to one could go
missing from another without any test noticing. They all read
src/routes/panelRoutes.tsx now, and a contract test holds the manifest to
the router, the translation bundle and the palette keywords.
The unused useZodForm helper goes, and CONTRIBUTING, frontend/CLAUDE.md and
the frontend README describe the useForm + rhfZodValidate pattern the
panel's forms actually use.
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