Install what the default-application roles are curated to

Seeding is deliberately conservative: a role whose preferred applications
are all missing is left alone rather than forced. That is right, and it
is also silent -- so a curated handler nobody installs presents as the
machine quietly going back to deciding defaults by installation order,
which is the problem seeding exists to fix. None of Loupe, Papers,
Decibels, Nautilus, mpv or sushi was declared anywhere.

Preview works, on org.gnome.NautilusPreviewer2 rather than the interface
its bus name suggests, but it opened tiled -- shoving the file manager
aside for something meant to be an overlay -- so it gets a float and
center rule sized to leave the file underneath visible.

xdg-utils and desktop-file-utils were undeclared too; seeding from
link-dotfiles started calling them, and the dependency contract said so.

Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L

config/dot/hypr/rules.lua

@@ -77,6 +77,18 @@ hl.window_rule({
     center = true,
 })
 
+-- Quick Look. The GNOME previewer is what the file manager opens on space,
+-- and it is an overlay rather than a window someone manages: tiled, it shoves
+-- the file manager aside and has to be dismissed before the list is usable
+-- again. Sized generously because a preview that needs zooming is not a
+-- preview; it still gets a margin so the file underneath stays visible.
+hl.window_rule({
+    match  = { class = "^org\\.gnome\\.NautilusPreviewer$" },
+    float  = true,
+    size   = { "monitor_w * 0.7", "monitor_h * 0.8" },
+    center = true,
+})
+
 -- Portal dialogs (file chooser, screen share picker) should always float.
 hl.window_rule({
     match = { class = "^(xdg-desktop-portal-gtk|org\\.freedesktop\\.impl\\.portal\\.desktop\\.gtk|hyprland-share-picker)$" },