worspace: Add partial window bound fix when switching between CSD and SSD on Wayland (#31335)

Partial fix for #31330

It fix the problem that the inset stay on after switching to SSD, but it
still have the problem that after that first redraw, it have the wrong
size. Just resizing it even once work. I guess the relevant code to fix
that would be ``handle_toplevel_decoration_event`` of
``crates/gpui/src/platform/linux/wayland/window.rs``, but trying to call
resize here does not seems to work correctly (might be just wrong
argument), and I would like to take a break on that for now.

Release Notes:

- N/A

(better wait for that to be completely fixed before adding it in the
changelog)

---------

Co-authored-by: Michael Sloan <michael@zed.dev>

crates/workspace/src/workspace.rs

@@ -7561,6 +7561,7 @@ fn parse_pixel_size_env_var(value: &str) -> Option<Size<Pixels>> {
     Some(size(px(width as f32), px(height as f32)))
 }
 
+/// Add client-side decorations (rounded corners, shadows, resize handling) when appropriate.
 pub fn client_side_decorations(
     element: impl IntoElement,
     window: &mut Window,
@@ -7569,8 +7570,9 @@ pub fn client_side_decorations(
     const BORDER_SIZE: Pixels = px(1.0);
     let decorations = window.window_decorations();
 
-    if matches!(decorations, Decorations::Client { .. }) {
-        window.set_client_inset(theme::CLIENT_SIDE_DECORATION_SHADOW);
+    match decorations {
+        Decorations::Client { .. } => window.set_client_inset(theme::CLIENT_SIDE_DECORATION_SHADOW),
+        Decorations::Server { .. } => window.set_client_inset(px(0.0)),
     }
 
     struct GlobalResizeEdge(ResizeEdge);