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/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)]