Release Preview 20 shared desktop, Android and Sargo updates

Restore Gaia settings and media workflows, extend native network adapters, and align the APK payload. Generate French/English changelogs and website entries from the simplified JSON source.

Validation: shared JS and Tundra unit tests; desktop workflows and persistence; signed APK payload parity; Sargo RAM and installed startup with boot readback. Android runtime qualification is recorded separately.

tundra/mms-codec/main_test.go

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-3.0-only
+package main
+
+import (
+	"encoding/base64"
+	"gitlab.com/ubports/development/core/nuntium/mms"
+	"testing"
+)
+
+func TestEncodePhotoAndText(t *testing.T) {
+	result, err := run(Request{Operation: "encode", Recipients: []string{"+15550199"}, Parts: []Part{{"text.txt", "text/plain", []byte("MMS test é")}, {"photo.jpg", "image/jpeg", []byte{255, 216, 255, 217}}}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	data := result.(map[string]any)["data"].([]byte)
+	message := mms.NewMRetrieveConf("")
+	message.Type = mms.TYPE_SEND_REQ
+	if err = mms.NewDecoder(data).Decode(message); err != nil {
+		t.Fatal(err)
+	}
+	if len(message.Attachments) != 2 || string(message.Attachments[0].Data) != "MMS test é" {
+		t.Fatalf("lost parts: %d", len(message.Attachments))
+	}
+}
+func TestSendRequiresMatchingConfirmation(t *testing.T) {
+	// M-Send.conf: transaction 't', MMS 1.1, status OK.
+	data, _ := base64.StdEncoding.DecodeString("jIGYdACNkZKA")
+	value, err := run(Request{Operation: "response", Data: data, Transaction: "t"})
+	if err != nil || !value.(map[string]any)["accepted"].(bool) {
+		t.Fatal(value, err)
+	}
+	if _, err = run(Request{Operation: "response", Data: data, Transaction: "other"}); err == nil {
+		t.Fatal("accepted unrelated response")
+	}
+}
+func TestLimits(t *testing.T) {
+	if _, err := run(Request{Operation: "retrieve", Data: make([]byte, limit+1)}); err == nil {
+		t.Fatal("oversize accepted")
+	}
+}