Maps · View: pins in view take presses, the popup hands focus back

A pin whose place lies outside the view takes no press or Tab, as its
popup would not show. The popup takes focus when it shows and, the
frame it stops showing by its button, Escape, the owner or a pan, hands
focus back to what held it, so focus stays in the map. Its body scrolls
past the room on its side and it paints over the zoom buttons. Tiles
load through gpui's logging loader, so a tile that fails says so. A
drag's owner check has a test, and the per-move viewport logs at debug.
The maps tests split into the map's and the popup's.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

AGENTS.md

@@ -196,7 +196,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - gpui orders Tab stops by `tab_index` before paint order, and registers none for an `invisible()` element. A stop that must come first where it sits, yet draw over what paints after it, stays in flow at zero size and raises what it shows (`i18n::SkipLink`): a lower `tab_index` would sort it before the root scope's own handle, so Tab from the root would pass it.
 - Color-blind safe charts swap Ely's chart hues for a set fitted to stay apart under Machado's protanopia, deuteranopia and tritanopia; a test holds every pair 0.10 apart in Oklab and each hue 3:1 on its page (`Theme::set_color_blind_safe`, in Ely's own palettes alone).
 - gpui 0.2.2 packs pictures in its atlas without padding and samples them with a linear filter, so a scaled picture's edge takes color from its atlas neighbor, and pictures laid edge to edge show seams. A map tile carries a one-pixel rim copied from its own edge and draws one of its pixels larger each side, clipped to its box (`maps::tile`).
-- A map keeps places in `f64`: at zoom 19 the world is 134 million pixels across. Its wheel pans and Command or Control with the wheel zooms about the pointer, as the canvas's does.
+- A map keeps places in `f64`: at zoom 19 the world is 134 million pixels across. Its wheel pans and Command or Control with the wheel zooms about the pointer, as the canvas's does. Its tiles stay in gpui's asset cache, as every `img()` picture does. Its popup is an overlay that is not modal: it takes focus when it shows, and the frame it stops showing, by any way out, hands focus back.
 
 ## Decisions