config_schema pages rendered raw keys as labels, ran the description into
the secret note without punctuation, floated Save mid-canvas and laid
fields on a two-column grid with an orphan cell.
- one ListRow per field (label + helper left, control right; JSON full width)
- label: manifest label/title, else the key in sentence case with acronyms
kept (maps_api_key -> Maps API key)
- helper sentences joined with punctuation (joinSentences)
- Save on the page heading row (Passwords & Logins' pattern), disabled
until dirty, spinner while saving
- only required fields are marked (settingsForm.optional -> .required)
- overview: Manage plugins as a heading-row button
- rail: a plugin row whose sub-page is open is named, not filled
- hello-runtime example: readable Chip style / gateway status copy
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