fix: test connection always showed success; add per-account test endpoint

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/6268035d-325f-422a-886f-8b2919127261

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

frontend/src/components/AddMailAccountModal.tsx

@@ -115,24 +115,37 @@ export function AddMailAccountModal({ account, onClose }: AddMailAccountModalPro
   };
 
   const handleTestConnection = async () => {
-    if (!formData.username || !formData.password || !formData.host) {
-      alert('Please fill in username, password, and host');
-      return;
-    }
-
     setTestStatus('testing');
     setTestMessage('');
     try {
-      await mailAccountsApi.test({
-        protocol: formData.protocol,
-        host: formData.host,
-        port: formData.port,
-        username: formData.username,
-        password: formData.password,
-        use_ssl: formData.use_ssl,
-      });
-      setTestStatus('success');
-      setTestMessage('Connection successful!');
+      let result: { success: boolean; message: string };
+
+      if (isEditMode && !formData.password && account?.id) {
+        // Edit mode with no new password entered — test using stored credentials
+        result = await mailAccountsApi.testExisting(account.id);
+      } else {
+        if (!formData.username || !formData.password || !formData.host) {
+          setTestStatus('error');
+          setTestMessage('Please fill in username, password, and host');
+          return;
+        }
+        result = await mailAccountsApi.test({
+          protocol: formData.protocol,
+          host: formData.host,
+          port: formData.port,
+          username: formData.username,
+          password: formData.password,
+          use_ssl: formData.use_ssl,
+        });
+      }
+
+      if (result.success) {
+        setTestStatus('success');
+        setTestMessage(result.message);
+      } else {
+        setTestStatus('error');
+        setTestMessage(result.message || 'Connection failed');
+      }
     } catch (error) {
       setTestStatus('error');
       const errorMessage = error instanceof Error && 'response' in error

frontend/src/lib/api.ts

@@ -338,6 +338,13 @@ export const mailAccountsApi = {
     return response.data;
   },
 
+  async testExisting(accountId: number): Promise<{ success: boolean; message: string }> {
+    const response = await api.post<{ success: boolean; message: string }>(
+      `/mail-accounts/${accountId}/test`
+    );
+    return response.data;
+  },
+
   async autoDetect(
     emailAddress: string
   ): Promise<{ success: boolean; suggestions: AutoDetectSuggestion[] }> {