Accumulate core-crate additions: capture requests, focus/workspace fixes, test coverage

Bundles several related changes to crates/core built up over this
session rather than committed incrementally:
- WindowManager::request_capture_workspace/drain_capture_requests (new
  manager/capture.rs) - backend-agnostic queuing for an off-screen
  workspace render, see the wayland-side commit for why this exists.
- focus_window now switches workspace as a side effect when the target
  isn't on the current one, matching Hyprland's focuswindow convention
  (manager/focus.rs).
- Assorted window/rules/theme field additions and their test coverage.

Left less granular than the repo's usual one-purpose-per-commit
convention deliberately: these accumulated across a long session
without being committed as they landed, and are too entangled
line-by-line to safely split apart now without risking mis-attributing
changes to the wrong commit message.

1 files changed, 5 insertions, 0 deletions

diff --git a/crates/core/src/manager/windows.rs b/crates/core/src/manager/windows.rs
index 4b4c0c8..d73dec1 100644
--- a/crates/core/src/manager/windows.rs
+++ b/crates/core/src/manager/windows.rs
@@ -25,6 +25,8 @@ impl WindowManager {
         // whatever a backend's `Window::new` happened to hardcode.
         window.border_color = self.theme.default_border_color;
         window.border_width = self.theme.default_border_width;
+        window.corner_radius = self.theme.default_corner_radius;
+        window.decorated = self.theme.default_decorated;
         let actions = self.rules.iter().find(|r| r.matcher.matches(&window)).map(|r| r.actions.clone());
         // See `Window::rules_applied`'s doc comment: a native Wayland window
         // still has empty title/app_id at this point, so a real (if
@@ -46,6 +48,9 @@ impl WindowManager {
             if let Some(width) = a.border_width {
                 window.border_width = width;
             }
+            if let Some(radius) = a.corner_radius {
+                window.corner_radius = radius;
+            }
             if let Some(pinned) = a.pinned {
                 window.always_on_top = pinned;
             }