feat(ui): render the location tray's pills, mini status and search error from a store

LocationControls (./ui/location) no longer builds the city and landmark
pills or writes the mini status and the search error: it presents the tray
and hands it to its publish option, so the entry stays Vue-free. The shell
publishes it to a new gev-location store and connects the controls, and
the dock renders it and calls chooseCity() and choosePoi(). The landmark
row still expands a frame after its pills render. The search field, its
toggle and the reset buttons keep their listeners. The location QA harness
reads the rendered elements.

docs/VUE-MIGRATION.md

@@ -120,7 +120,9 @@ They contain no application state.
    VisualSettings publishes to the `gev-display` store; the buttons keep
    their owner's listeners; the map source chips and status badge render
    what `createMapSourceControls()` publishes beside it, so `./ui/maps`
-   needs no Vue),
+   needs no Vue; the location tray's city and landmark pills, mini status
+   and search error render what `LocationControls` publishes to the
+   `gev-location` store, and the search field keeps its listeners),
    the phone shell, then Cockpit. Layers that write into the right rail
    directly gain a slot instead.