fix(bluebubbles): prevent message routing to group chats when targeting phone numbers

When sending a message to a phone number like +12622102921, the
resolveChatGuidForTarget function was finding and returning a GROUP
CHAT containing that phone number instead of a direct DM chat.

The bug was in the participantMatch fallback logic which matched ANY
chat containing the phone number as a participant, including groups.

This fix adds a check to ensure participantMatch only considers DM
chats (identified by ';-;' separator in the chat GUID). Group chats
(identified by ';+;' separator) are now explicitly excluded from
handle-based matching.

If a phone number only exists in a group chat (no direct DM exists),
the function now correctly returns null, which causes the send to
fail with a clear error rather than accidentally messaging a group.

Added test case to verify this behavior.

extensions/bluebubbles/src/send.test.ts

@@ -187,6 +187,47 @@ describe("send", () => {
       expect(result).toBe("iMessage;-;+15551234567");
     });
 
+    it("returns null when handle only exists in group chat (not DM)", async () => {
+      // This is the critical fix: if a phone number only exists as a participant in a group chat
+      // (no direct DM chat), we should NOT send to that group. Return null instead.
+      mockFetch
+        .mockResolvedValueOnce({
+          ok: true,
+          json: () =>
+            Promise.resolve({
+              data: [
+                {
+                  guid: "iMessage;+;group-the-council",
+                  participants: [
+                    { address: "+12622102921" },
+                    { address: "+15550001111" },
+                    { address: "+15550002222" },
+                  ],
+                },
+              ],
+            }),
+        })
+        // Empty second page to stop pagination
+        .mockResolvedValueOnce({
+          ok: true,
+          json: () => Promise.resolve({ data: [] }),
+        });
+
+      const target: BlueBubblesSendTarget = {
+        kind: "handle",
+        address: "+12622102921",
+        service: "imessage",
+      };
+      const result = await resolveChatGuidForTarget({
+        baseUrl: "http://localhost:1234",
+        password: "test",
+        target,
+      });
+
+      // Should return null, NOT the group chat GUID
+      expect(result).toBeNull();
+    });
+
     it("returns null when chat not found", async () => {
       mockFetch.mockResolvedValueOnce({
         ok: true,

extensions/bluebubbles/src/send.ts

@@ -257,11 +257,17 @@ export async function resolveChatGuidForTarget(params: {
           return guid;
         }
         if (!participantMatch && guid) {
-          const participants = extractParticipantAddresses(chat).map((entry) =>
+          // Only consider DM chats (`;-;` separator) as participant matches.
-            normalizeBlueBubblesHandle(entry),
+          // Group chats (`;+;` separator) should never match when searching by handle/phone.
-          );
+          // This prevents routing "send to +1234567890" to a group chat that contains that number.
-          if (participants.includes(normalizedHandle)) {
+          const isDmChat = guid.includes(";-;");
-            participantMatch = guid;
+          if (isDmChat) {
+            const participants = extractParticipantAddresses(chat).map((entry) =>
+              normalizeBlueBubblesHandle(entry),
+            );
+            if (participants.includes(normalizedHandle)) {
+              participantMatch = guid;
+            }
           }
         }
       }