Add a shared `schema:font-family` whitelist validator in
app.common.types.font that only allows letters, digits, spaces,
hyphens, underscores, and dots in font family names. Apply the schema
to create-font-variant and update-font RPC endpoints on the
backend, and add client-side validation in the dashboard fonts UI.
Include unit tests for the schema and integration tests for the RPC
handlers.
Signed-off-by: Andrey Antukh <niwi@niwi.nz>
67d9567971