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/geolocation/client_ip.go

@@ -0,0 +1,90 @@
+package geolocation
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/log"
+)
+
+type IpClient struct {
+	currLocation *Location
+}
+
+type ipAPIResponse struct {
+	Lat  float64 `json:"lat"`
+	Lon  float64 `json:"lon"`
+	City string  `json:"city"`
+}
+
+func newIpClient() *IpClient {
+	return &IpClient{
+		currLocation: &Location{
+			Latitude:  0.0,
+			Longitude: 0.0,
+		},
+	}
+}
+
+func (c *IpClient) Subscribe(id string) chan Location {
+	ch := make(chan Location, 1)
+	if location, err := c.GetLocation(); err != nil {
+		ch <- location
+	} else {
+		close(ch)
+	}
+
+	return ch
+}
+
+func (c *IpClient) Unsubscribe(id string) {
+	// Stub
+}
+
+func (c *IpClient) Close() {
+	// Stub
+}
+
+func (c *IpClient) GetLocation() (Location, error) {
+	client := &http.Client{
+		Timeout: 10 * time.Second,
+	}
+
+	result := Location{
+		Latitude:  0.0,
+		Longitude: 0.0,
+	}
+
+	resp, err := client.Get("http://ip-api.com/json/")
+	if err != nil {
+		return result, fmt.Errorf("failed to fetch IP location: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return result, fmt.Errorf("ip-api.com returned status %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return result, fmt.Errorf("failed to read response: %w", err)
+	}
+
+	var data ipAPIResponse
+	if err := json.Unmarshal(body, &data); err != nil {
+		return result, fmt.Errorf("failed to parse response: %w", err)
+	}
+
+	if data.Lat == 0 && data.Lon == 0 {
+		return result, fmt.Errorf("missing location data in response")
+	}
+
+	log.Infof("Fetched IP-based location: %s (%.4f, %.4f)", data.City, data.Lat, data.Lon)
+	result.Latitude = data.Lat
+	result.Longitude = data.Lon
+
+	return result, nil
+}