Fix Sway floating frame geometry handling

Use the floating container geometry whenever a view is inside a `floating_con`, so frame/deco/content coordinates stay stable and window chrome no longer jumps during refreshes. Also remove the custom `title_format` left-padding (and its related comment) from the Sway config so title text is no longer artificially offset.

compositor/sway/nebula-sway.conf

@@ -47,7 +47,6 @@ focus_follows_mouse yes
 # so they can be identified, dragged, and resized with the mouse.
 #
 # Nebula overlays traffic-light controls on the focused window title bar.
-# Horizontal padding keeps the Sway title text clear of those buttons.
 # Menu-style chrome (application name, future File/Edit) stays in the top bar.
 #
 # This is temporary infrastructure until Nebula owns server-side decorations.
@@ -59,7 +58,6 @@ titlebar_border_thickness 1
 default_border normal 1
 default_floating_border normal 1
 hide_edge_borders none
-title_format "                      %title"
 
 # class                 border    backgr.   text      indicator child_border
 client.focused          #3d4d62   #1a222e   #e8ecf2   #7ea0c4   #3d4d62