Fix Signal Desktop v8.0.0 binary ACI encoding compatibility.

Signal Desktop v8.0.0 switched from string ACI fields to binary ACI encoding
in protobuf messages. This causes null ServiceId values when the library
cannot parse the new format, breaking reactions, mentions, quotes, and other
message features.

Two-part fix:
1. Bump signal-service-java from unofficial_137 to unofficial_138 which adds
   dual-format ACI parsing (string + binary fallback).
2. Add defensive null guards in MessageEnvelope.java for cases where ServiceId
   resolution still fails (e.g. ACI.UNKNOWN), preserving message content with
   UNKNOWN_UUID fallback rather than dropping entire message components.

See: https://github.com/AsamK/signal-cli/pull/1944

diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 9b1bd5f4..0000001 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -11,7 +11,7 @@ slf4j-api = { module = "org.slf4j:slf4j-api", version.ref = "slf4j" }
 slf4j-jul = { module = "org.slf4j:jul-to-slf4j", version.ref = "slf4j" }
 logback = "ch.qos.logback:logback-classic:1.5.25"

-signalservice = "com.github.turasa:signal-service-java:2.15.3_unofficial_137"
+signalservice = "com.github.turasa:signal-service-java:2.15.3_unofficial_138"
 sqlite = "org.xerial:sqlite-jdbc:3.51.1.0"
 hikari = "com.zaxxer:HikariCP:7.0.2"
 junit-jupiter-bom = { module = "org.junit:junit-bom", version.ref = "junit" }
diff --git a/lib/src/main/java/org/asamk/signal/manager/api/MessageEnvelope.java b/lib/src/main/java/org/asamk/signal/manager/api/MessageEnvelope.java
index 37946057..57a5a0f4 100644
--- a/lib/src/main/java/org/asamk/signal/manager/api/MessageEnvelope.java
+++ b/lib/src/main/java/org/asamk/signal/manager/api/MessageEnvelope.java
@@ -132,6 +132,7 @@ public record MessageEnvelope(
             return new Data(dataMessage.getTimestamp(),
                     dataMessage.getGroupContext().map(GroupContext::from),
                     dataMessage.getStoryContext()
+                            .filter(s -> s.getAuthorServiceId() != null)
                             .map((SignalServiceDataMessage.StoryContext storyContext) -> StoryContext.from(storyContext,
                                     recipientResolver,
                                     addressResolver)),
@@ -143,9 +144,10 @@ public record MessageEnvelope(
                     dataMessage.isEndSession(),
                     dataMessage.isProfileKeyUpdate(),
                     dataMessage.getProfileKey().isPresent(),
-                    dataMessage.getReaction().map(r -> Reaction.from(r, recipientResolver, addressResolver)),
+                    dataMessage.getReaction()
+                            .filter(r -> r.getTargetAuthor() != null)
+                            .map(r -> Reaction.from(r, recipientResolver, addressResolver)),
                     dataMessage.getQuote()
-                            .filter(q -> q.getAuthor() != null && q.getAuthor().isValid())
                             .map(q -> Quote.from(q, recipientResolver, addressResolver, fileProvider)),
                     dataMessage.getPayment().map(p -> p.getPaymentNotification().isPresent() ? Payment.from(p) : null),
                     dataMessage.getAttachments()
@@ -159,10 +161,15 @@ public record MessageEnvelope(
                                     .toList())
                             .orElse(List.of()),
                     dataMessage.getPollCreate().map(PollCreate::from),
-                    dataMessage.getPollVote().map(p -> PollVote.from(p, recipientResolver, addressResolver)),
+                    dataMessage.getPollVote()
+                            .filter(p -> p.getTargetAuthor() != null)
+                            .map(p -> PollVote.from(p, recipientResolver, addressResolver)),
                     dataMessage.getPollTerminate().map(PollTerminate::from),
                     dataMessage.getMentions()
-                            .map(a -> a.stream().map(m -> Mention.from(m, recipientResolver, addressResolver)).toList())
+                            .map(a -> a.stream()
+                                    .filter(m -> m.getServiceId() != null)
+                                    .map(m -> Mention.from(m, recipientResolver, addressResolver))
+                                    .toList())
                             .orElse(List.of()),
                     dataMessage.getPreviews()
                             .map(a -> a.stream().map(preview -> Preview.from(preview, fileProvider)).toList())
@@ -241,10 +248,13 @@ public record MessageEnvelope(
                     RecipientAddressResolver addressResolver,
                     final AttachmentFileProvider fileProvider
             ) {
+                final var author = quote.getAuthor() != null && quote.getAuthor().isValid()
+                        ? addressResolver.resolveRecipientAddress(recipientResolver.resolveRecipient(quote.getAuthor()))
+                                .toApiRecipientAddress()
+                        : new RecipientAddress(RecipientAddress.UNKNOWN_UUID);
                 return new Quote(quote.getId(),
-                        addressResolver.resolveRecipientAddress(recipientResolver.resolveRecipient(quote.getAuthor()))
-                                .toApiRecipientAddress(),
-                        Optional.of(quote.getText()),
+                        author,
+                        Optional.ofNullable(quote.getText()),
                         quote.getMentions() == null
                                 ? List.of()
                                 : quote.getMentions()