spotify-player: inset the special workspace window; keep cava on with playback

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

settings/hyprland.nix

@@ -333,6 +333,20 @@ in
               workspace = "special:music silent",
             })
 
+            -- Inset it rather than filling the screen, so the workspace
+            -- underneath still frames it. Floating is what makes a percentage
+            -- size stick: a tiled window is sized by the layout, which would
+            -- just expand it back to the full area. Matched on title for the
+            -- same reason as above, and because matching on the special
+            -- workspace would depend on the assignment rule running first.
+            hl.window_rule({
+              name  = "spotify-player-inset",
+              match = { title = "^spotify-player$" },
+              float = true,
+              size = "80% 80%",
+              center = true,
+            })
+
             -- Games stall on other workspaces: no frame callbacks = no render =
             -- game loop blocks. Keep them ticking in the background at
             -- misc:render_unfocused_fps (15).