fix(imessage): normalize messaging targets (#1708)

Co-authored-by: Aaron Ng <1653630+aaronn@users.noreply.github.com>

extensions/imessage/src/channel.ts

@@ -8,8 +8,10 @@ import {
   imessageOnboardingAdapter,
   IMessageConfigSchema,
   listIMessageAccountIds,
+  looksLikeIMessageTargetId,
   migrateBaseNameToDefaultAccount,
   normalizeAccountId,
+  normalizeIMessageMessagingTarget,
   PAIRING_APPROVED_MESSAGE,
   resolveChannelMediaMaxBytes,
   resolveDefaultIMessageAccountId,
@@ -110,14 +112,9 @@ export const imessagePlugin: ChannelPlugin<ResolvedIMessageAccount> = {
     resolveToolPolicy: resolveIMessageGroupToolPolicy,
   },
   messaging: {
+    normalizeTarget: normalizeIMessageMessagingTarget,
     targetResolver: {
-      looksLikeId: (raw) => {
-        const trimmed = raw.trim();
-        if (!trimmed) return false;
-        if (/^(imessage:|chat_id:)/i.test(trimmed)) return true;
-        if (trimmed.includes("@")) return true;
-        return /^\+?\d{3,}$/.test(trimmed);
-      },
+      looksLikeId: looksLikeIMessageTargetId,
       hint: "<handle|chat_id:ID>",
     },
   },