feat(config): Add directional output selection via separate direction field

Add support for directional output selection in the move-to-output action
using a separate `direction` field instead of overloading OutputMatch.

API additions:
- Add Workspace::connector() to get the connector showing a workspace
- Add Connector::connector_in_direction() to find outputs directionally

Implementation:
- Move directional finding logic from toml-config to compositor
- Algorithm uses center-to-center distance with axis-aligned preference
- Add GetWorkspaceConnector and GetConnectorInDirection IPC messages

Configuration changes:
- Add optional `direction` field to move-to-output action
- Either `output` or `direction` must be specified (not both)
- Valid directions: "left", "right", "up", "down"

Example usage:
  logo+control+shift+right = { type = "move-to-output", direction = "right" }

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>

jay-config/src/lib.rs

@@ -186,6 +186,13 @@ impl Workspace {
     pub fn window(self) -> Window {
         get!(Window(0)).get_workspace_window(self)
     }
+
+    /// Returns the connector that contains this workspace.
+    ///
+    /// If no such connector exists, [`Connector::exists`] returns false.
+    pub fn connector(self) -> Connector {
+        get!(Connector(0)).get_workspace_connector(self)
+    }
 }
 
 /// Returns the workspace with the given name.