dashboard: a subscribed node's own figures when it is in focus

A node in focus showed this node's `/peers` entry for it and the links it reports:
what this node knows of it, never what it says of itself, though the page subscribes to
it. Now a subscribed node in focus shows its own figures first (`Node:`), as this
node's are (its `/admin/stats`), then this node's entry for it (`as this node sees it`)
and its links, each a branch. A link in focus shows each end's paths to the other as
that end has them: this node's, and a subscribed node's from its `/peers`.

The page reads them from the node every 2 s while it is in focus (`readFigures`,
`figuresOf`), with its narrow token, which may look at a node as any user with a
capability may; pages of other origins may now call `/admin/stats` and `/peers`
(`cors::open`), as they do a node's links and messages. Where they can't be read, the
box says why.

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