fix(bluebubbles): hide internal routing metadata in cross-context markers

When sending cross-context messages via BlueBubbles, the origin marker was
exposing internal chat_guid routing info like '[from bluebubbles:chat_guid:any;-;+19257864429]'.

This adds a formatTargetDisplay() function to the BlueBubbles plugin that:
- Extracts phone numbers from chat_guid formats (iMessage;-;+1234567890 -> +1234567890)
- Normalizes handles for clean display
- Avoids returning raw chat_guid formats containing internal routing metadata

Now cross-context markers show clean identifiers like '[from +19257864429]' instead
of exposing internal routing details to recipients.

extensions/bluebubbles/src/channel.ts

@@ -25,9 +25,11 @@ import { resolveBlueBubblesMessageId } from "./monitor.js";
 import { probeBlueBubbles, type BlueBubblesProbe } from "./probe.js";
 import { sendMessageBlueBubbles } from "./send.js";
 import {
+  extractHandleFromChatGuid,
   looksLikeBlueBubblesTargetId,
   normalizeBlueBubblesHandle,
   normalizeBlueBubblesMessagingTarget,
+  parseBlueBubblesTarget,
 } from "./targets.js";
 import { bluebubblesMessageActions } from "./actions.js";
 import { monitorBlueBubblesProvider, resolveWebhookPathFromConfig } from "./monitor.js";
@@ -148,6 +150,47 @@ export const bluebubblesPlugin: ChannelPlugin<ResolvedBlueBubblesAccount> = {
       looksLikeId: looksLikeBlueBubblesTargetId,
       hint: "<handle|chat_guid:GUID|chat_id:ID|chat_identifier:ID>",
     },
+    formatTargetDisplay: ({ target, display }) => {
+      // Helper to extract a clean handle from any BlueBubbles target format
+      const extractCleanDisplay = (value: string | undefined): string | null => {
+        const trimmed = value?.trim();
+        if (!trimmed) return null;
+        try {
+          const parsed = parseBlueBubblesTarget(trimmed);
+          if (parsed.kind === "chat_guid") {
+            const handle = extractHandleFromChatGuid(parsed.chatGuid);
+            if (handle) return handle;
+          }
+          if (parsed.kind === "handle") {
+            return normalizeBlueBubblesHandle(parsed.to);
+          }
+        } catch {
+          // Fall through
+        }
+        // Strip common prefixes and try raw extraction
+        const stripped = trimmed
+          .replace(/^bluebubbles:/i, "")
+          .replace(/^chat_guid:/i, "")
+          .replace(/^chat_id:/i, "")
+          .replace(/^chat_identifier:/i, "");
+        const handle = extractHandleFromChatGuid(stripped);
+        if (handle) return handle;
+        // Don't return raw chat_guid formats - they contain internal routing info
+        if (stripped.includes(";-;") || stripped.includes(";+;")) return null;
+        return stripped;
+      };
+
+      // Try to get a clean display from the display parameter first
+      const cleanDisplay = extractCleanDisplay(display);
+      if (cleanDisplay) return cleanDisplay;
+
+      // Fall back to extracting from target
+      const cleanTarget = extractCleanDisplay(target);
+      if (cleanTarget) return cleanTarget;
+
+      // Last resort: return display or target as-is
+      return display?.trim() || target?.trim() || "";
+    },
   },
   setup: {
     resolveAccountId: ({ accountId }) => normalizeAccountId(accountId),