feat: per-session log files

New "Neues Log pro Session" checkbox in settings. When enabled,
each app session creates a separate log file with timestamp
(e.g. fileuploader-2026-03-11_20-30-15.log). File is only created
when an upload actually completes. When disabled, behaves as before
(single appending log file).

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

lib/config-store.js

@@ -27,6 +27,7 @@ const DEFAULTS = {
     alwaysOnTop: false,
     shutdownAfterFinish: 'nothing', // nothing | sleep | shutdown | restart
     logFilePath: '',
+    sessionLog: false,
     resumeQueueOnLaunch: true,
     parallelUploadCount: 0, // 0 = use per-hoster limits only
     scaleParallelUploads: false,

main.js

@@ -68,7 +68,7 @@ function getDefaultLogFilePath() {
   return path.join(baseDir, 'fileuploader.log');
 }
 
-function getLogFilePath() {
+function getBaseLogFilePath() {
   const config = configStore.load();
   const customPath = config && config.globalSettings
     ? String(config.globalSettings.logFilePath || '').trim()
@@ -76,6 +76,28 @@ function getLogFilePath() {
   return customPath || getDefaultLogFilePath();
 }
 
+// Session log: one file per app session, created lazily on first upload
+let sessionLogPath = null;
+
+function getLogFilePath() {
+  const config = configStore.load();
+  const useSessionLog = config && config.globalSettings && config.globalSettings.sessionLog;
+  if (!useSessionLog) return getBaseLogFilePath();
+
+  // Lazy: generate session log path on first call
+  if (!sessionLogPath) {
+    const base = getBaseLogFilePath();
+    const dir = path.dirname(base);
+    const ext = path.extname(base);
+    const name = path.basename(base, ext);
+    const now = new Date();
+    const pad = (n) => String(n).padStart(2, '0');
+    const ts = `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}_${pad(now.getHours())}-${pad(now.getMinutes())}-${pad(now.getSeconds())}`;
+    sessionLogPath = path.join(dir, `${name}-${ts}${ext}`);
+  }
+  return sessionLogPath;
+}
+
 function appendUploadLog(hoster, link, fileName) {
   try {
     const logPath = getLogFilePath();

renderer/app.js

@@ -1591,6 +1591,10 @@ function renderSettings() {
         <input type="text" class="key-input settings-autosave" id="logFilePathInput" value="${escapeAttr(globalSettings.logFilePath || '')}" placeholder="Standardpfad verwenden">
         <button class="btn btn-xs btn-secondary" id="chooseLogFilePathBtn">Ordner wählen</button>
       </div>
+      <div class="settings-row">
+        <label>Neues Log pro Session</label>
+        <input type="checkbox" class="settings-autosave" id="sessionLogInput" ${globalSettings.sessionLog ? 'checked' : ''}>
+      </div>
     </div>
   `;
   container.appendChild(generalPanel);
@@ -1693,6 +1697,7 @@ async function saveSettings(options = {}) {
   const globalSettings = {
     ...(config.globalSettings || {}),
     logFilePath: (document.getElementById('logFilePathInput')?.value || '').trim(),
+    sessionLog: !!document.getElementById('sessionLogInput')?.checked,
     resumeQueueOnLaunch: !!document.getElementById('resumeQueueOnLaunchInput')?.checked,
     parallelUploadCount: Math.max(0, Math.min(100, parseInt(document.getElementById('parallelUploadCountInput')?.value || '0', 10) || 0)),
     scaleParallelUploads: !!document.getElementById('scaleParallelUploadsInput')?.checked,