diff --git a/main.js b/main.js
index 2376ca0..956f5e3 100644
--- a/main.js
+++ b/main.js
@@ -1,5 +1,5 @@
 // main.js — Main-Process with concurrent folder upload/download, progress events, and temp-dir cleanup
-const { app, BrowserWindow, ipcMain, dialog, Menu, nativeImage } = require('electron');
+const { app, BrowserWindow, ipcMain, dialog, Menu, nativeImage, Tray, shell, clipboard } = require('electron');
 const ppath = require('path');
 const fs = require('fs');
 const os = require('os');
@@ -15,6 +15,7 @@ const {
   createRepoGitea,
   checkGiteaConnection,
   listGiteaRepos,
+  getGiteaUserHeatmap,
   getGiteaRepoContents,
   getGiteaFileContent,
   uploadGiteaFile,
@@ -254,13 +255,32 @@ function getSafeTmpDir(baseName) {
 /* -----------------------------
    app / window
    ----------------------------- */
+let tray = null;
+
+function createTray(win) {
+  const iconPath = ppath.join(__dirname, 'renderer', 'icon.png');
+  tray = new Tray(nativeImage.createFromPath(iconPath).resize({ width: 16, height: 16 }));
+  tray.setToolTip('Git Manager Explorer Pro');
+  const menu = Menu.buildFromTemplate([
+    { label: 'Öffnen', click: () => { win.show(); win.focus(); } },
+    { type: 'separator' },
+    { label: 'Beenden', click: () => { app.quit(); } }
+  ]);
+  tray.setContextMenu(menu);
+  tray.on('double-click', () => { win.show(); win.focus(); });
+}
+
 function createWindow() {
   // Entfernt das Menü (File, Edit, View...) komplett
   Menu.setApplicationMenu(null);
 
+  const startHidden = process.argv.includes('--hidden');
+
   const win = new BrowserWindow({
     width: 1200,
     height: 820,
+    frame: false,
+    show: !startHidden,
     webPreferences: {
       preload: ppath.join(__dirname, 'preload.js'),
       nodeIntegration: false,
@@ -269,6 +289,17 @@ function createWindow() {
   });
   win.loadFile(ppath.join(__dirname, 'renderer', 'index.html'));
   // win.webContents.openDevTools();
+
+  createTray(win);
+
+  // Schließen-Button -> Tray statt Beenden (nur wenn Autostart aktiv)
+  win.on('close', (e) => {
+    const { enabled } = app.getLoginItemSettings();
+    if (enabled) {
+      e.preventDefault();
+      win.hide();
+    }
+  });
 }
 
 app.whenReady().then(() => {
@@ -804,6 +835,21 @@ ipcMain.handle('list-gitea-repos', async (event, data) => {
   }
 });
 
+ipcMain.handle('get-gitea-user-heatmap', async (event, data) => {
+  try {
+    const credentials = readCredentials();
+    const token = (data && data.token) || (credentials && credentials.giteaToken);
+    const url = (data && data.url) || (credentials && credentials.giteaURL);
+    if (!token || !url) return { ok: false, error: 'missing-token-or-url' };
+
+    const result = await getGiteaUserHeatmap({ token, url });
+    return { ok: true, ...result };
+  } catch (e) {
+    console.error('get-gitea-user-heatmap error', e);
+    return { ok: false, error: mapIpcError(e) };
+  }
+});
+
 ipcMain.handle('get-gitea-repo-contents', async (event, data) => {
   try {
     const credentials = readCredentials();
@@ -2349,6 +2395,55 @@ ipcMain.handle('save-recent', async (event, recent) => {
 
 // main.js - Updater IPC Handlers
 
+// Window Controls
+ipcMain.on('window-minimize', (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) win.minimize();
+});
+ipcMain.on('window-maximize', (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) { win.isMaximized() ? win.unmaximize() : win.maximize(); }
+});
+ipcMain.on('window-close', (event) => {
+  const win = BrowserWindow.fromWebContents(event.sender);
+  if (win) win.close();
+});
+
+// Autostart
+ipcMain.handle('set-autostart', (event, enable) => {
+  app.setLoginItemSettings({
+    openAtLogin: enable,
+    openAsHidden: true,
+    args: ['--hidden']
+  });
+  return { ok: true };
+});
+
+ipcMain.handle('get-autostart', () => {
+  const settings = app.getLoginItemSettings({ args: ['--hidden'] });
+  return { ok: true, enabled: settings.openAtLogin };
+});
+
+ipcMain.handle('copy-to-clipboard', async (_event, text) => {
+  try {
+    clipboard.writeText(String(text || ''));
+    return { ok: true };
+  } catch (e) {
+    return { ok: false, error: String(e) };
+  }
+});
+
+ipcMain.handle('open-external-url', async (_event, rawUrl) => {
+  try {
+    const url = String(rawUrl || '').trim();
+    if (!url) return { ok: false, error: 'Leere URL' };
+    await shell.openExternal(url);
+    return { ok: true };
+  } catch (e) {
+    return { ok: false, error: String(e) };
+  }
+});
+
 // 1. Version abfragen
 ipcMain.handle('get-app-version', async () => {
   return { ok: true, version: app.getVersion() }; 
@@ -2407,4 +2502,106 @@ ipcMain.handle('test-gitea-connection', async (event, data) => {
     console.error('test-gitea-connection error', e);
     return { ok: false, error: mapIpcError(e) };
   }
+});
+
+ipcMain.handle('validate-repo-name', async (_event, data) => {
+  try {
+    const name = String(data && data.name || '').trim();
+    const platform = String(data && data.platform || 'gitea').trim().toLowerCase();
+    const validPattern = /^[a-zA-Z0-9](?:[a-zA-Z0-9._-]{0,98}[a-zA-Z0-9])?$/;
+    const validFormat = validPattern.test(name);
+
+    if (!name) {
+      return { ok: true, validFormat: false, existsExact: false, similar: [], checked: false, reason: 'empty-name' };
+    }
+
+    if (!validFormat) {
+      return { ok: true, validFormat: false, existsExact: false, similar: [], checked: false, reason: 'invalid-format' };
+    }
+
+    if (platform !== 'gitea') {
+      return { ok: true, validFormat: true, existsExact: false, similar: [], checked: false, reason: 'platform-not-supported' };
+    }
+
+    const credentials = readCredentials();
+    if (!credentials || !credentials.giteaToken || !credentials.giteaURL) {
+      return { ok: true, validFormat: true, existsExact: false, similar: [], checked: false, reason: 'missing-credentials' };
+    }
+
+    const list = await listGiteaRepos({ token: credentials.giteaToken, url: credentials.giteaURL });
+    const repos = Array.isArray(list) ? list : [];
+    const allNames = repos
+      .map(r => String(r && r.name || '').trim())
+      .filter(Boolean);
+
+    const lower = name.toLowerCase();
+    const normalized = lower.replace(/[\s._-]+/g, '');
+    const existsExact = allNames.some(n => n.toLowerCase() === lower);
+
+    const similar = allNames
+      .filter(n => {
+        const nLower = n.toLowerCase();
+        const nNorm = nLower.replace(/[\s._-]+/g, '');
+        return nLower.includes(lower) || lower.includes(nLower) || nNorm.includes(normalized) || normalized.includes(nNorm);
+      })
+      .filter(n => n.toLowerCase() !== lower)
+      .slice(0, 8);
+
+    return {
+      ok: true,
+      validFormat: true,
+      existsExact,
+      similar,
+      checked: true,
+      totalKnown: allNames.length
+    };
+  } catch (e) {
+    return { ok: false, error: String(e) };
+  }
+});
+
+ipcMain.handle('check-clone-target-collisions', async (_event, data) => {
+  try {
+    const targetDir = String(data && data.targetDir || '').trim();
+    const rawRepos = Array.isArray(data && data.repos) ? data.repos : [];
+    const repos = rawRepos
+      .map(v => String(v || '').trim())
+      .filter(Boolean)
+      .map(v => {
+        const parts = v.split('/');
+        const repo = (parts[1] || '').trim();
+        return { input: v, repo };
+      })
+      .filter(r => r.repo);
+
+    const duplicateRepoNames = [];
+    const seen = new Map();
+    for (const item of repos) {
+      const key = item.repo.toLowerCase();
+      const count = (seen.get(key) || 0) + 1;
+      seen.set(key, count);
+    }
+    for (const [name, count] of seen.entries()) {
+      if (count > 1) duplicateRepoNames.push(name);
+    }
+
+    const existingTargets = [];
+    if (targetDir) {
+      for (const item of repos) {
+        const repoDir = ppath.join(targetDir, item.repo);
+        if (fs.existsSync(repoDir)) {
+          existingTargets.push(repoDir);
+        }
+      }
+    }
+
+    return {
+      ok: true,
+      duplicateRepoNames,
+      existingTargets,
+      hasCollisions: duplicateRepoNames.length > 0 || existingTargets.length > 0
+    };
+  } catch (e) {
+    return { ok: false, error: String(e) };
+  }
 });
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