fix: honor line default runtime account

extensions/line/src/accounts.test.ts

@@ -103,6 +103,32 @@ describe("LINE accounts", () => {
       expect(account.name).toBe("Business Bot");
     });
 
+    it("uses configured defaultAccount when accountId is omitted", () => {
+      const cfg: OpenClawConfig = {
+        channels: {
+          line: {
+            defaultAccount: "business",
+            accounts: {
+              business: {
+                enabled: true,
+                channelAccessToken: "business-token",
+                channelSecret: "business-secret",
+                name: "Business Bot",
+              },
+            },
+          },
+        },
+      };
+
+      const account = resolveLineAccount({ cfg });
+
+      expect(account.accountId).toBe("business");
+      expect(account.enabled).toBe(true);
+      expect(account.channelAccessToken).toBe("business-token");
+      expect(account.channelSecret).toBe("business-secret");
+      expect(account.name).toBe("Business Bot");
+    });
+
     it("returns empty token when not configured", () => {
       const cfg: OpenClawConfig = {};
 

extensions/line/src/accounts.ts

@@ -94,7 +94,9 @@ export function resolveLineAccount(params: {
   accountId?: string;
 }): ResolvedLineAccount {
   const cfg = params.cfg;
-  const accountId = normalizeSharedAccountId(params.accountId);
+  const accountId = normalizeSharedAccountId(
+    params.accountId ?? resolveDefaultLineAccountId(cfg),
+  );
   const lineConfig = cfg.channels?.line as LineConfig | undefined;
   const accounts = lineConfig?.accounts;
   const accountConfig =