fix(signal): handle reactions in dataMessage.reaction format (#1)

* fix(signal): handle reactions inside dataMessage.reaction

Signal reactions can arrive in two formats:
1. envelope.reactionMessage (already handled)
2. envelope.dataMessage.reaction (now handled)

The signal-cli SSE events use the second format, which was being
misinterpreted as a message with attachments, leading to 'broken
media / attachments' errors.

Changes:
- Add reaction property to SignalDataMessage type
- Check both envelope.reactionMessage and dataMessage.reaction
- Improve body content detection to properly identify reaction-only messages
- Add test for dataMessage.reaction format

* fix(signal): reaction notifications work when account is phone number

When reactionNotifications mode is 'own', notifications would never fire
because resolveSignalReactionTarget() returned a UUID but
shouldEmitSignalReactionNotification() compared it against the account
phone number, which never matched.

The fix:
- Add optional 'phone' field to SignalReactionTarget type
- Extract phone number first in resolveSignalReactionTarget(), include
  it even when UUID is present
- In shouldEmitSignalReactionNotification() 'own' mode, check phone
  match first before falling back to UUID comparison

This ensures reactions to your own messages are properly detected when
the Signal account is configured as a phone number and the reaction
event contains both targetAuthor (phone) and targetAuthorUuid.

* fix(signal): include phone in reaction target for own-mode matching

When targetAuthorUuid is present, also store targetAuthor phone number
in the reaction target. This allows own-mode reaction notifications to
match when comparing account phone against UUID-based targets.

src/signal/monitor.tool-result.test.ts

@@ -197,6 +197,45 @@ describe("monitorSignalProvider tool results", () => {
     expect(updateLastRouteMock).not.toHaveBeenCalled();
   });
 
+  it("ignores reaction-only messages when reactions live in dataMessage", async () => {
+    const abortController = new AbortController();
+
+    streamMock.mockImplementation(async ({ onEvent }) => {
+      const payload = {
+        envelope: {
+          sourceNumber: "+15550001111",
+          sourceName: "Ada",
+          timestamp: 1,
+          dataMessage: {
+            reaction: {
+              emoji: "👍",
+              targetAuthor: "+15550002222",
+              targetSentTimestamp: 2,
+            },
+            attachments: [{}],
+          },
+        },
+      };
+      await onEvent({
+        event: "receive",
+        data: JSON.stringify(payload),
+      });
+      abortController.abort();
+    });
+
+    await monitorSignalProvider({
+      autoStart: false,
+      baseUrl: "http://127.0.0.1:8080",
+      abortSignal: abortController.signal,
+    });
+
+    await flush();
+
+    expect(replyMock).not.toHaveBeenCalled();
+    expect(sendMock).not.toHaveBeenCalled();
+    expect(updateLastRouteMock).not.toHaveBeenCalled();
+  });
+
   it("enqueues system events for reaction notifications", async () => {
     config = {
       ...config,

src/signal/monitor.ts

@@ -70,6 +70,7 @@ type SignalDataMessage = {
     groupName?: string | null;
   } | null;
   quote?: { text?: string | null } | null;
+  reaction?: SignalReactionMessage | null;
 };
 
 type SignalAttachment = {
@@ -403,8 +404,14 @@ export async function monitorSignalProvider(
       }
       const dataMessage =
         envelope.dataMessage ?? envelope.editMessage?.dataMessage;
-      if (envelope.reactionMessage && !dataMessage) {
-        const reaction = envelope.reactionMessage;
+      const reaction =
+        envelope.reactionMessage ?? dataMessage?.reaction ?? null;
+      const messageText = (dataMessage?.message ?? "").trim();
+      const quoteText = dataMessage?.quote?.text?.trim() ?? "";
+      const hasBodyContent =
+        Boolean(messageText || quoteText) ||
+        Boolean(!reaction && dataMessage?.attachments?.length);
+      if (reaction && !hasBodyContent) {
         if (reaction.isRemove) return; // Ignore reaction removals
         const emojiLabel = reaction.emoji?.trim() || "emoji";
         const senderDisplay = formatSignalSenderDisplay(sender);
@@ -550,7 +557,6 @@ export async function monitorSignalProvider(
           ? isSignalSenderAllowed(sender, effectiveGroupAllow)
           : true
         : dmAllowed;
-      const messageText = (dataMessage.message ?? "").trim();
 
       let mediaPath: string | undefined;
       let mediaType: string | undefined;