Add GeoClue2 integration as alternative to IP location (#1856)

* feat: switch auto location in weather widget to use GeoClue2 instead of simple IP check

* nix: enable GeoClue2 service by default

* lint: fix line endings

* fix: fall back to IP location if GeoClue is not available

core/internal/server/location/handlers.go

@@ -0,0 +1,61 @@
+package location
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/server/models"
+)
+
+type LocationEvent struct {
+	Type string `json:"type"`
+	Data State  `json:"data"`
+}
+
+func HandleRequest(conn net.Conn, req models.Request, manager *Manager) {
+	switch req.Method {
+	case "location.getState":
+		handleGetState(conn, req, manager)
+	case "location.subscribe":
+		handleSubscribe(conn, req, manager)
+
+	default:
+		models.RespondError(conn, req.ID, fmt.Sprintf("unknown method: %s", req.Method))
+	}
+}
+
+func handleGetState(conn net.Conn, req models.Request, manager *Manager) {
+	models.Respond(conn, req.ID, manager.GetState())
+}
+
+func handleSubscribe(conn net.Conn, req models.Request, manager *Manager) {
+	clientID := fmt.Sprintf("client-%p", conn)
+	stateChan := manager.Subscribe(clientID)
+	defer manager.Unsubscribe(clientID)
+
+	initialState := manager.GetState()
+	event := LocationEvent{
+		Type: "state_changed",
+		Data: initialState,
+	}
+
+	if err := json.NewEncoder(conn).Encode(models.Response[LocationEvent]{
+		ID:     req.ID,
+		Result: &event,
+	}); err != nil {
+		return
+	}
+
+	for state := range stateChan {
+		event := LocationEvent{
+			Type: "state_changed",
+			Data: state,
+		}
+		if err := json.NewEncoder(conn).Encode(models.Response[LocationEvent]{
+			Result: &event,
+		}); err != nil {
+			return
+		}
+	}
+}