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/_private/client.rs

@@ -1385,6 +1385,31 @@ impl ConfigClient {
         workspaces
     }
 
+    /// Returns the connector that the workspace is currently on.
+    /// Returns `Connector(0)` (invalid connector) if the workspace doesn't exist or
+    /// isn't assigned to any connector.
+    pub fn get_workspace_connector(&self, workspace: Workspace) -> Connector {
+        let res = self.send_with_response(&ClientMessage::GetWorkspaceConnector { workspace });
+        get_response!(res, Connector(0), GetWorkspaceConnector { connector });
+        connector
+    }
+
+    /// Finds the connector in the specified direction from the given connector.
+    /// Returns `Connector(0)` (invalid connector) if no connector exists in that direction
+    /// or if the source connector is invalid.
+    pub fn get_connector_in_direction(
+        &self,
+        connector: Connector,
+        direction: Direction,
+    ) -> Connector {
+        let res = self.send_with_response(&ClientMessage::GetConnectorInDirection {
+            connector,
+            direction,
+        });
+        get_response!(res, Connector(0), GetConnectorInDirection { connector });
+        connector
+    }
+
     pub fn set_client_matcher_capabilities(
         &self,
         matcher: ClientMatcher,

jay-config/src/_private/ipc.rs

@@ -805,6 +805,13 @@ pub enum ClientMessage<'a> {
         show: bool,
     },
     GetShowTitles,
+    GetWorkspaceConnector {
+        workspace: Workspace,
+    },
+    GetConnectorInDirection {
+        connector: Connector,
+        direction: Direction,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -1043,6 +1050,12 @@ pub enum Response {
     GetShowTitles {
         show: bool,
     },
+    GetWorkspaceConnector {
+        connector: Connector,
+    },
+    GetConnectorInDirection {
+        connector: Connector,
+    },
 }
 
 #[derive(Serialize, Deserialize, Debug)]