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.

1 files changed, 11 insertions, 6 deletions

diff --git a/docs/dashboard.md b/docs/dashboard.md
index 590f72f..da69a16 100644
--- a/docs/dashboard.md
+++ b/docs/dashboard.md
@@ -287,14 +287,18 @@ What the Figures box shows is what is in focus:
 
 * **Nothing** (the default): this node's figures.
 * **A node** (click it on the map, or its row in Peers): this node's entry for that
-  peer (as `/peers` has it), and the links that member reports. Ringed on the map,
+  peer (as `/peers` has it), and the links that member reports. A node the page
+  subscribes to: its own figures first, as this node's are (its `/admin/stats`, read
+  from it every 2 s while in focus, with the page's token), then this node's entry for
+  it (`as this node sees it`) and its links, each a branch. Ringed on the map,
   highlighted in Peers. A second click on its row, a click beside the nodes or a click
   on this node goes back.
 * **A link** (click it): whether the member list intends it, each end's report of it
   (transport, relayed, round trip, dormant, its other transports, and how old the
-  report is), and, where this node is an end, the link as this node has it in `/peers`:
-  where messages go, its paths (each with its connection and round trip), and the
-  addresses known of the other end. Both ends are ringed.
+  report is), and, where this node or a node the page subscribes to is an end, the link
+  as that end has it in its `/peers` (a subscribed node's read from it, as its
+  figures): where messages go, its paths (each with its connection and round trip),
+  and the addresses known of the other end. Both ends are ringed.
 
 The focus is in the page's address (`#<node ID>`, or the two IDs of a link), so a
 reload keeps it and a link to the page can name it.
@@ -321,8 +325,9 @@ The box is as tall as its rows, up to eight; then it scrolls.
 ## Figures
 
 The figures of what is in focus, as a tree, its keys at the top level and how many
-beside the title: this node's `/admin/stats`, or a peer's `/peers` entry and, after it,
-the links it reports (`links`), where the page has them.
+beside the title: this node's `/admin/stats`; a subscribed node's own (`Node:`), with
+this node's entry for it and its links after; or a peer's `/peers` entry and, after
+it, the links it reports (`links`), where the page has them.
 Branches stay as opened across updates, and ages count on between them. What each figure means: [`measurements.md`](measurements.md).
 
 Some values get a reading after them, muted, in parentheses: a node ID its alias