keep tile outlines honest when the anchor tile fails to load

A building or grounds outline from tiles now needs the tile holding the
anchor: when that tile fails and only neighbours load, no neighbouring
building or area stands in. Nominatim name tags holding several
";"-separated names match each name. Document recovery from a stuck
public-Nominatim dispatch marker, correct the phone credit comment,
drive the slow-device queue test with a mocked performance clock, and
credit GitHub handles in the changelog.

src/ui/styles/mobile-shell.css

@@ -378,12 +378,12 @@ body.mobile-shell:not(.recording-mode):not(.cockpit-mode):not(.ui-clean-view)
   right: auto;
   bottom: calc(var(--mobile-tab-space) + 106px) !important;
   left: 10px;
-  /* Cesium's credit block is absolutely positioned inside this box, so the
-     box needs a real width (a max-width alone leaves it 0 wide) for the
-     credits to wrap at the screen width rather than one word per line. The
-     width applies before the 0.8 scale, keeping the scaled line 10px from the
-     right edge, so every credit and "Data attribution" stay on screen. Like
-     the offset above, it must beat the dock's width: auto !important. */
+  /* With the base rule's nowrap the credits run off the right edge, and a
+     max-width alone wrapped them into a narrow column: the line needs wrapping
+     and a real width. The width applies before the 0.8 scale, keeping the
+     scaled line 10px from the right edge, so every credit and "Data
+     attribution" stay on screen. Like the offset above, it must beat the
+     dock's width: auto !important. */
   width: calc((100vw - 20px) / 0.8) !important;
   max-width: none !important;
   white-space: normal;