MapInfo (library/components/info) answers "what can this map do for
you?" with real output the map makes, pre-generated so it opens at once.
The examples are an ordered list of kinds rather than a fixed set,
because maps make different things: an image (a poster), pages (a packet
that shows its first page and expands to every page), a deck (cards that
expand from a stack to a grid) and a table (a real excerpt of the
spreadsheet a map exports, with translatable headers). An example whose
image is missing drops out quietly: no broken-image icon, no empty frame.
The pointer at the button goes for good once that map's popup has been
opened and closed; a checkbox in the popup turns it off on every map.
Both are kept in localStorage behind a guard, so private browsing cannot
break the page. On a phone the popup takes the whole screen; Escape
closes it and focus returns to the button. The pointer's motion stops
under prefers-reduced-motion.
All of its text is one new catalogue area, 'mapInfo', in all eleven
locales: the component's own words, and each map's lead, takeaway and
note as mapInfo.tab.<tabId>.<field>. One area because a bundle ships only
the areas its source names, and the gallery that mounts a popup per map
names none of the maps' own areas. This commit carries the UPG-100
map's two sentences; the other maps' follow.
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