Add startup retry logic and persist logs across refresh

Retry connectActiveProfile up to 3 times with 1s delay before showing
the error page. Persist log buffer to sessionStorage so logs survive
page refresh and are visible in the settings log viewer.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/App.tsx

@@ -16,6 +16,8 @@ import ProfileSelectionPage from "./pages/ProfileSelectionPage";
 import ErrorPage from "./components/shared/ErrorPage";
 
 const STARTUP_TIMEOUT_MS = 10_000;
+const MAX_RETRIES = 3;
+const RETRY_DELAY_MS = 1_000;
 
 export default function App() {
   const { t } = useTranslation();
@@ -23,29 +25,42 @@ export default function App() {
   const [dbReady, setDbReady] = useState(false);
   const [startupError, setStartupError] = useState<string | null>(null);
   const timeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const cancelledRef = useRef(false);
 
   useEffect(() => {
     if (activeProfile && !isLoading) {
       setDbReady(false);
       setStartupError(null);
+      cancelledRef.current = false;
 
       timeoutRef.current = setTimeout(() => {
         setStartupError(t("error.startupTimeout"));
       }, STARTUP_TIMEOUT_MS);
 
-      connectActiveProfile()
-        .then(() => {
+      const attemptConnect = async (attempt: number): Promise<void> => {
+        try {
+          await connectActiveProfile();
+          if (cancelledRef.current) return;
           if (timeoutRef.current) clearTimeout(timeoutRef.current);
           setDbReady(true);
-        })
-        .catch((err) => {
+        } catch (err) {
+          if (cancelledRef.current) return;
+          console.error(`Failed to connect profile (attempt ${attempt}/${MAX_RETRIES}):`, err);
+          if (attempt < MAX_RETRIES) {
+            await new Promise((r) => setTimeout(r, RETRY_DELAY_MS));
+            if (!cancelledRef.current) return attemptConnect(attempt + 1);
+          } else {
             if (timeoutRef.current) clearTimeout(timeoutRef.current);
-          console.error("Failed to connect profile:", err);
             setStartupError(err instanceof Error ? err.message : String(err));
-        });
+          }
+        }
+      };
+
+      attemptConnect(1);
     }
 
     return () => {
+      cancelledRef.current = true;
       if (timeoutRef.current) clearTimeout(timeoutRef.current);
     };
   }, [activeProfile, isLoading, connectActiveProfile, t]);

src/services/logService.ts

@@ -9,11 +9,32 @@ export interface LogEntry {
 type LogListener = () => void;
 
 const MAX_ENTRIES = 500;
+const STORAGE_KEY = "simpl-resultat-logs";
 const logs: LogEntry[] = [];
 const listeners = new Set<LogListener>();
 
 let initialized = false;
 
+function loadFromStorage() {
+  try {
+    const stored = sessionStorage.getItem(STORAGE_KEY);
+    if (stored) {
+      const parsed: LogEntry[] = JSON.parse(stored);
+      logs.push(...parsed);
+    }
+  } catch {
+    // ignore corrupted storage
+  }
+}
+
+function saveToStorage() {
+  try {
+    sessionStorage.setItem(STORAGE_KEY, JSON.stringify(logs));
+  } catch {
+    // ignore quota errors
+  }
+}
+
 function addEntry(level: LogLevel, args: unknown[]) {
   const message = args
     .map((a) => {
@@ -31,6 +52,7 @@ function addEntry(level: LogLevel, args: unknown[]) {
     logs.splice(0, logs.length - MAX_ENTRIES);
   }
 
+  saveToStorage();
   listeners.forEach((fn) => fn());
 }
 
@@ -38,6 +60,8 @@ export function initLogCapture() {
   if (initialized) return;
   initialized = true;
 
+  loadFromStorage();
+
   const origLog = console.log.bind(console);
   const origWarn = console.warn.bind(console);
   const origError = console.error.bind(console);
@@ -64,6 +88,7 @@ export function getLogs(): readonly LogEntry[] {
 
 export function clearLogs() {
   logs.length = 0;
+  saveToStorage();
   listeners.forEach((fn) => fn());
 }