Release 0.11.2

Bug fixes for the buildings-and-levels work in 0.11.0, every one of them found by
using the feature rather than by the suite.

Anyone running 0.11.0 or 0.11.1 with more than one level should take this
release: the map drew markers from every level on whichever floor plan happened
to be showing, which is the failure ADR-017 exists to prevent, and it was in the
one component that draws the map. The viewer also had no way to choose a level,
and the editor never accepted a click at all - its handler was bound only if the
map was already a picker at mount, and the editor opens with nothing selected.

Also: a level's native size could not be set (the settings page had no height
field), the same search could return different rows because fourteen searchers
truncated without an ORDER BY, and both map pages carried a scrollbar from
subtracting the wrong page chrome from the viewport height.

No schema change, and the plugin contract stays at 0.20.0.

The version and the changelog are the release; the detail is in the entry.

docs/PROJECT-MAP.md

@@ -11,7 +11,7 @@ never by editing this file.
 
 | series | value | governed by |
 |---|---|---|
-| product `__version__` | `0.11.1` | ADR-007 |
+| product `__version__` | `0.11.2` | ADR-007 |
 | plugin contract `__contract_version__` | `0.20.0` | ADR-002 |
 
 They move independently. A contract bump is not a release.