Provide a clearer message for TLS 1.3 cases

lib/KOReaderSync/KOReaderSyncClient.cpp

@@ -609,8 +609,17 @@ const char* KOReaderSyncClient::lastFailureDetail() {
   }
   // Network/TLS case: esp_http_client_perform() failed before getting a status code.
   if (lastHttpCode == 0 && lastEspError != 0) {
-    snprintf(g_failureDetailBuf, sizeof(g_failureDetailBuf), "%s: %s (heap %u/%u contig)", lastOperation,
-             esp_err_to_name(lastEspError), lastHeapAtFailure, lastContigHeapAtFailure);
+    // Detect TLS handshake failures on HTTPS URLs — likely caused by the server
+    // requiring TLS 1.3 which the ESP32 mbedTLS library does not support.
+    if (lastEspError == ESP_ERR_HTTP_CONNECT && KOREADER_STORE.getBaseUrl().rfind("https", 0) == 0) {
+      snprintf(
+          g_failureDetailBuf, sizeof(g_failureDetailBuf),
+          "%s: TLS handshake failed. Server may require TLS 1.3 (unsupported). Try a different server or use HTTP.",
+          lastOperation);
+    } else {
+      snprintf(g_failureDetailBuf, sizeof(g_failureDetailBuf), "%s: %s (heap %u/%u contig)", lastOperation,
+               esp_err_to_name(lastEspError), lastHeapAtFailure, lastContigHeapAtFailure);
+    }
     return g_failureDetailBuf;
   }
   // Server case: got an HTTP status the client didn't recognize as success.

src/activities/reader/KOReaderSyncActivity.cpp

@@ -529,7 +529,15 @@ void KOReaderSyncActivity::render(RenderLock&&) {
 
   if (state == SYNC_FAILED) {
     renderer.drawCenteredText(UI_10_FONT_ID, 280, tr(STR_SYNC_FAILED_MSG), true, EpdFontFamily::BOLD);
-    renderer.drawCenteredText(UI_10_FONT_ID, 320, statusMessage.c_str());
+
+    // Word-wrap the detail message so long TLS/network diagnostics aren't clipped.
+    const int lineHeight = renderer.getLineHeight(UI_10_FONT_ID);
+    const auto lines = renderer.wrappedText(UI_10_FONT_ID, statusMessage.c_str(), contentRect.width - 20, 4);
+    int y = 320;
+    for (const auto& line : lines) {
+      renderer.drawCenteredText(UI_10_FONT_ID, y, line.c_str());
+      y += lineHeight;
+    }
 
     const auto labels = mappedInput.mapLabels(tr(STR_BACK), "", "", "");
     GUI.drawButtonHints(renderer, labels.btn1, labels.btn2, labels.btn3, labels.btn4);

src/activities/settings/KOReaderAuthActivity.cpp

@@ -53,6 +53,11 @@ void KOReaderAuthActivity::performAuthentication() {
     } else {
       state = FAILED;
       errorMessage = KOReaderSyncClient::errorString(result);
+      const char* detail = KOReaderSyncClient::lastFailureDetail();
+      if (detail && detail[0]) {
+        errorMessage += " — ";
+        errorMessage += detail;
+      }
     }
   }
   requestUpdate();
@@ -72,6 +77,11 @@ void KOReaderAuthActivity::performRegistration() {
     } else {
       state = FAILED;
       errorMessage = KOReaderSyncClient::errorString(result);
+      const char* detail = KOReaderSyncClient::lastFailureDetail();
+      if (detail && detail[0]) {
+        errorMessage += " — ";
+        errorMessage += detail;
+      }
     }
   }
   requestUpdate();
@@ -120,7 +130,12 @@ void KOReaderAuthActivity::render(RenderLock&&) {
   } else if (state == FAILED) {
     const char* failedMsg = (mode == Mode::REGISTER) ? tr(STR_REGISTER_FAILED) : tr(STR_AUTH_FAILED);
     renderer.drawCenteredText(UI_10_FONT_ID, top, failedMsg, true, EpdFontFamily::BOLD);
-    renderer.drawCenteredText(UI_10_FONT_ID, top + height + 10, errorMessage.c_str());
+    const auto lines = renderer.wrappedText(UI_10_FONT_ID, errorMessage.c_str(), contentRect.width - 20, 4);
+    int y = top + height + 10;
+    for (const auto& line : lines) {
+      renderer.drawCenteredText(UI_10_FONT_ID, y, line.c_str());
+      y += height;
+    }
   }
 
   const auto labels = mappedInput.mapLabels(tr(STR_BACK), "", "", "");