QR-Generator, Ordner-Sharing, Baustellenschild weg, Button-Fix

backend/src/db.js

@@ -467,4 +467,41 @@ if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='lin
 }
 
 
+// ── QR-Codes ──────────────────────────────────────────────────────────────────
+if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='qr_codes'").get()) {
+  db.exec(`
+    CREATE TABLE qr_codes (
+      id           INTEGER PRIMARY KEY AUTOINCREMENT,
+      user_id      INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      label        TEXT    NOT NULL DEFAULT '',
+      url          TEXT    NOT NULL,
+      size         INTEGER NOT NULL DEFAULT 256,
+      fg_color     TEXT    NOT NULL DEFAULT '#000000',
+      bg_color     TEXT    NOT NULL DEFAULT '#ffffff',
+      margin       INTEGER NOT NULL DEFAULT 4,
+      dot_style    TEXT    NOT NULL DEFAULT 'square',
+      corner_style TEXT    NOT NULL DEFAULT 'square',
+      caption      TEXT    NOT NULL DEFAULT '',
+      caption_pos  TEXT    NOT NULL DEFAULT 'bottom',
+      caption_color TEXT   NOT NULL DEFAULT '#000000',
+      caption_size INTEGER NOT NULL DEFAULT 14,
+      created_at   DATETIME DEFAULT NULL
+    )
+  `);
+}
+
+// ── Link-Folder Shares ────────────────────────────────────────────────────────
+if (!db.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name='link_folder_shares'").get()) {
+  db.exec(`
+    CREATE TABLE link_folder_shares (
+      id          INTEGER PRIMARY KEY AUTOINCREMENT,
+      folder_id   INTEGER NOT NULL REFERENCES link_list_folders(id) ON DELETE CASCADE,
+      shared_by   INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      shared_with INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      created_at  DATETIME DEFAULT NULL,
+      UNIQUE(folder_id, shared_with)
+    )
+  `);
+}
+
 module.exports = db;

backend/src/index.js

@@ -67,6 +67,7 @@ fs.readdirSync(toolsDir, { withFileTypes: true })
   });
 
 app.use('/api/tools/snippets', require('./tools/snippets/routes'));
+app.use('/api/tools/qrcodes',  require('./tools/qrcodes/routes'));
 
 const PUBLIC = path.join(__dirname, '../public');
 
@@ -78,9 +79,7 @@ app.get('/manifest.json', (_req, res) => {
 app.get('/sw.js', (_req, res) => {
   res.setHeader('Content-Type', 'application/javascript');
   res.setHeader('Service-Worker-Allowed', '/');
-  res.setHeader('Cache-Control', 'no-store, no-cache, must-revalidate');
-  res.setHeader('Pragma', 'no-cache');
-  res.setHeader('Expires', '0');
+  res.setHeader('Cache-Control', 'no-cache');
   res.sendFile(path.join(PUBLIC, 'sw.js'));
 });
 

backend/src/tools/linkliste/routes.js

@@ -86,7 +86,32 @@ router.get('/', authenticate, (req, res) => {
     ORDER BY l.title ASC
   `).all(uid);
 
-  res.json({ own, folders, shared, sharedByMe });
+  // Ordner die mit mir geteilt wurden (inkl. deren Links)
+  const sharedFolders = db.prepare(`
+    SELECT f.*, u.username as owner_name
+    FROM link_list_folders f
+    JOIN link_folder_shares s ON s.folder_id=f.id
+    JOIN users u ON u.id=f.user_id
+    WHERE s.shared_with=?
+    ORDER BY f.name ASC
+  `).all(uid);
+
+  const sharedFolderLinks = sharedFolders.map(folder => ({
+    ...folder,
+    links: db.prepare('SELECT * FROM link_list WHERE folder_id=? ORDER BY sort_order,id').all(folder.id)
+  }));
+
+  // Ordner die ich geteilt habe
+  const sharedFoldersByMe = db.prepare(`
+    SELECT f.*, u.username as shared_with_name
+    FROM link_list_folders f
+    JOIN link_folder_shares s ON s.folder_id=f.id
+    JOIN users u ON u.id=s.shared_with
+    WHERE f.user_id=?
+    ORDER BY f.name ASC
+  `).all(uid);
+
+  res.json({ own, folders, shared, sharedByMe, sharedFolders: sharedFolderLinks, sharedFoldersByMe });
 });
 
 router.post('/', authenticate, (req, res) => {
@@ -153,4 +178,35 @@ router.delete('/:id/share/:userId', authenticate, (req, res) => {
   res.json({ ok: true });
 });
 
+// ── Ordner-Shares ─────────────────────────────────────────────────────────────
+router.get('/folders/:id/shares', authenticate, (req, res) => {
+  const f = db.prepare('SELECT * FROM link_list_folders WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
+  if (!f) return res.status(404).json({ error: 'Nicht gefunden' });
+  const shares = db.prepare(`
+    SELECT u.id, u.username, s.created_at as shared_at
+    FROM link_folder_shares s JOIN users u ON u.id=s.shared_with
+    WHERE s.folder_id=?
+  `).all(f.id);
+  res.json(shares);
+});
+
+router.post('/folders/:id/share', authenticate, (req, res) => {
+  const f = db.prepare('SELECT * FROM link_list_folders WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
+  if (!f) return res.status(404).json({ error: 'Nicht gefunden' });
+  const target = db.prepare('SELECT * FROM users WHERE username=?').get(req.body.username);
+  if (!target) return res.status(404).json({ error: 'Benutzer nicht gefunden' });
+  if (target.id === req.user.id) return res.status(400).json({ error: 'Kann nicht mit dir selbst teilen' });
+  db.prepare(`INSERT OR IGNORE INTO link_folder_shares (folder_id, shared_by, shared_with, created_at) VALUES (?,?,?,datetime('now','localtime'))`)
+    .run(f.id, req.user.id, target.id);
+  res.json({ ok: true });
+});
+
+router.delete('/folders/:id/share/:userId', authenticate, (req, res) => {
+  const f = db.prepare('SELECT * FROM link_list_folders WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
+  if (!f) return res.status(404).json({ error: 'Nicht gefunden' });
+  db.prepare('DELETE FROM link_folder_shares WHERE folder_id=? AND shared_with=?').run(f.id, req.params.userId);
+  res.json({ ok: true });
+});
+
+
 module.exports = router;

backend/src/tools/qrcodes/routes.js

@@ -0,0 +1,41 @@
+const express = require('express');
+const db      = require('../../db');
+const { authenticate } = require('../../middleware/auth');
+const router  = express.Router();
+
+router.get('/', authenticate, (req, res) => {
+  res.json(db.prepare('SELECT * FROM qr_codes WHERE user_id=? ORDER BY created_at DESC').all(req.user.id));
+});
+
+router.post('/', authenticate, (req, res) => {
+  const uid = req.user.id;
+  const { label='', url, size=256, fg_color='#000000', bg_color='#ffffff', margin=4,
+          dot_style='square', corner_style='square', caption='', caption_pos='bottom',
+          caption_color='#000000', caption_size=14 } = req.body;
+  if (!url?.trim()) return res.status(400).json({ error: 'URL erforderlich' });
+  const r = db.prepare(`
+    INSERT INTO qr_codes (user_id,label,url,size,fg_color,bg_color,margin,dot_style,corner_style,caption,caption_pos,caption_color,caption_size,created_at)
+    VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,datetime('now','localtime'))
+  `).run(uid, label.trim(), url.trim(), size, fg_color, bg_color, margin, dot_style, corner_style, caption.trim(), caption_pos, caption_color, caption_size);
+  res.json(db.prepare('SELECT * FROM qr_codes WHERE id=?').get(r.lastInsertRowid));
+});
+
+router.put('/:id', authenticate, (req, res) => {
+  const qr = db.prepare('SELECT * FROM qr_codes WHERE id=? AND user_id=?').get(req.params.id, req.user.id);
+  if (!qr) return res.status(404).json({ error: 'Nicht gefunden' });
+  const fields = ['label','url','size','fg_color','bg_color','margin','dot_style','corner_style','caption','caption_pos','caption_color','caption_size'];
+  const updates = {};
+  fields.forEach(f => { if (req.body[f] !== undefined) updates[f] = req.body[f]; });
+  if (!Object.keys(updates).length) return res.json(qr);
+  const sets = Object.keys(updates).map(f=>`${f}=?`).join(',');
+  db.prepare(`UPDATE qr_codes SET ${sets} WHERE id=?`).run(...Object.values(updates), qr.id);
+  res.json(db.prepare('SELECT * FROM qr_codes WHERE id=?').get(qr.id));
+});
+
+router.delete('/:id', authenticate, (req, res) => {
+  const r = db.prepare('DELETE FROM qr_codes WHERE id=? AND user_id=?').run(req.params.id, req.user.id);
+  if (!r.changes) return res.status(404).json({ error: 'Nicht gefunden' });
+  res.json({ ok: true });
+});
+
+module.exports = router;

frontend/package.json

@@ -7,6 +7,7 @@
     "build": "vite build"
   },
   "dependencies": {
+    "qrcode": "^1.5.4",
     "react": "^18.2.0",
     "react-dom": "^18.2.0"
   },
@@ -14,4 +15,4 @@
     "@vitejs/plugin-react": "^4.0.0",
     "vite": "^5.0.0"
   }
-}
+}

frontend/src/toolRegistry.js

@@ -68,16 +68,16 @@ export const TOOLS = [
   {
     id:        'skizze',
     Icon:      SkizzeIcon,
-    label:     'CAD-Skizzen 🚧',
-    navLabel:  'CAD-Skizzen 🚧',
+    label:     'CAD-Skizzen',
+    navLabel:  'CAD-Skizzen',
     group:     'Werkzeuge',
     component: Skizze,
   },
   {
     id:        'devtools',
     Icon:      WrenchIcon,
-    label:     'Dev-Tools 🚧',
-    navLabel:  'Dev-Tools 🚧',
+    label:     'Dev-Tools',
+    navLabel:  'Dev-Tools',
     group:     'Werkzeuge',
     component: DevTools,
   },

frontend/src/tools/devtools.jsx

@@ -1,5 +1,6 @@
-import { useState } from 'react';
-import { S } from '../lib.js';
+import { useState, useRef, useEffect, useCallback } from 'react';
+import { S, api } from '../lib.js';
+import QRCode from 'qrcode';
 
 const MONTHS   = ['Januar','Februar','März','April','Mai','Juni','Juli','August','September','Oktober','November','Dezember'];
 const WEEKDAYS = ['Sonntag','Montag','Dienstag','Mittwoch','Donnerstag','Freitag','Samstag'];
@@ -2678,6 +2679,401 @@ function FarbRechner({ toast, mobile }) {
   );
 }
 
+// ──────────────────────────────────────────────────────────── QR-Generator ──
+
+const QR_SIZES   = [128, 192, 256, 320, 512];
+const DOT_STYLES = [
+  { id:'square',   label:'Quadrat' },
+  { id:'rounded',  label:'Abgerundet' },
+  { id:'dots',     label:'Punkte' },
+  { id:'classy',   label:'Elegant' },
+];
+const CORNER_STYLES = [
+  { id:'square',   label:'Quadrat' },
+  { id:'rounded',  label:'Abgerundet' },
+  { id:'dot',      label:'Punkt' },
+];
+const CAP_POS = [
+  { id:'top',    label:'Oben' },
+  { id:'bottom', label:'Unten' },
+  { id:'none',   label:'Keine' },
+];
+
+function drawQrToCanvas(canvas, data, opts) {
+  const { size, fgColor, bgColor, margin, dotStyle, cornerStyle, caption, captionPos, captionColor, captionSize } = opts;
+  const capH  = caption && captionPos !== 'none' ? (captionSize + 16) : 0;
+  const totalH = size + capH;
+  canvas.width  = size;
+  canvas.height = totalH;
+  const ctx = canvas.getContext('2d');
+  ctx.fillStyle = bgColor;
+  ctx.fillRect(0, 0, size, totalH);
+
+  return QRCode.create(data, { errorCorrectionLevel: 'M' }).then(qr => {
+    const modules = qr.modules;
+    const n       = modules.size;
+    const cellSize = (size - margin * 2) / n;
+    const qrTop   = captionPos === 'top' ? capH : 0;
+
+    ctx.fillStyle = fgColor;
+
+    for (let row = 0; row < n; row++) {
+      for (let col = 0; col < n; col++) {
+        if (!modules.get(row, col)) continue;
+        const x = margin + col * cellSize;
+        const y = qrTop + margin + row * cellSize;
+        const w = cellSize;
+
+        // Corner squares (finder patterns): rows/cols 0-7 and last 7
+        const isCorner = (row < 7 && col < 7) || (row < 7 && col >= n-7) || (row >= n-7 && col < 7);
+
+        if (isCorner) {
+          if (cornerStyle === 'dot') {
+            const r = w * 0.5;
+            ctx.beginPath(); ctx.arc(x+r, y+r, r, 0, Math.PI*2); ctx.fill();
+          } else if (cornerStyle === 'rounded') {
+            const r = w * 0.35;
+            ctx.beginPath(); ctx.roundRect(x, y, w, w, r); ctx.fill();
+          } else {
+            ctx.fillRect(x, y, w, w);
+          }
+        } else {
+          if (dotStyle === 'dots') {
+            const r = w * 0.45;
+            ctx.beginPath(); ctx.arc(x+r, y+r, r, 0, Math.PI*2); ctx.fill();
+          } else if (dotStyle === 'rounded') {
+            const r = w * 0.3;
+            ctx.beginPath(); ctx.roundRect(x, y, w, w, r); ctx.fill();
+          } else if (dotStyle === 'classy') {
+            const r = w * 0.4;
+            ctx.beginPath(); ctx.roundRect(x+1, y+1, w-2, w-2, r); ctx.fill();
+          } else {
+            ctx.fillRect(x, y, w, w);
+          }
+        }
+      }
+    }
+
+    // Caption
+    if (caption && captionPos !== 'none') {
+      ctx.fillStyle  = captionColor;
+      ctx.font       = `${captionSize}px sans-serif`;
+      ctx.textAlign  = 'center';
+      ctx.textBaseline = 'middle';
+      const cy = captionPos === 'top' ? capH / 2 : size + capH / 2;
+      ctx.fillText(caption, size / 2, cy, size - 16);
+    }
+  }).catch(() => {});
+}
+
+function QrGenerator({ toast, mobile }) {
+  const canvasRef  = useRef(null);
+  const [tab,      setTab]      = useState('create');
+  const [saved,    setSaved]    = useState([]);
+  const [editing,  setEditing]  = useState(null); // saved qr being edited
+
+  // Form state
+  const DEFAULTS = {
+    label:'', url:'', size:256, fgColor:'#000000', bgColor:'#ffffff',
+    margin:4, dotStyle:'square', cornerStyle:'square',
+    caption:'', captionPos:'bottom', captionColor:'#000000', captionSize:14,
+  };
+  const [form, setForm] = useState(DEFAULTS);
+  const [busy, setBusy] = useState(false);
+
+  const set = (k, v) => setForm(p => ({...p, [k]: v}));
+
+  const loadSaved = () => api('/tools/qrcodes').then(setSaved).catch(()=>{});
+  useEffect(()=>{ loadSaved(); },[]);
+
+  // Re-render QR whenever form changes
+  useEffect(()=>{
+    if (!canvasRef.current || !form.url.trim()) return;
+    drawQrToCanvas(canvasRef.current, form.url, {
+      size:form.size, fgColor:form.fgColor, bgColor:form.bgColor,
+      margin:form.margin, dotStyle:form.dotStyle, cornerStyle:form.cornerStyle,
+      caption:form.caption, captionPos:form.captionPos,
+      captionColor:form.captionColor, captionSize:form.captionSize,
+    });
+  }, [form]);
+
+  const download = () => {
+    if (!canvasRef.current) return;
+    const a = document.createElement('a');
+    a.href = canvasRef.current.toDataURL('image/png');
+    a.download = `qrcode-${form.label||'export'}.png`;
+    a.click();
+  };
+
+  const save = async () => {
+    if (!form.url.trim()) { toast('URL erforderlich','error'); return; }
+    setBusy(true);
+    try {
+      const payload = { label:form.label, url:form.url, size:form.size,
+        fg_color:form.fgColor, bg_color:form.bgColor, margin:form.margin,
+        dot_style:form.dotStyle, corner_style:form.cornerStyle,
+        caption:form.caption, caption_pos:form.captionPos,
+        caption_color:form.captionColor, caption_size:form.captionSize };
+      if (editing) {
+        const r = await api(`/tools/qrcodes/${editing}`, {method:'PUT', body:payload});
+        setSaved(p=>p.map(q=>q.id===r.id?r:q));
+        setEditing(null);
+        toast('Gespeichert ✓');
+      } else {
+        const r = await api('/tools/qrcodes', {body:payload});
+        setSaved(p=>[r,...p]);
+        toast('QR-Code gespeichert ✓');
+      }
+    } catch(e) { toast(e.message,'error'); }
+    setBusy(false);
+  };
+
+  const deleteQr = async id => {
+    await api(`/tools/qrcodes/${id}`,{method:'DELETE'});
+    setSaved(p=>p.filter(q=>q.id!==id));
+    toast('Gelöscht');
+  };
+
+  const editQr = qr => {
+    setForm({ label:qr.label, url:qr.url, size:qr.size,
+      fgColor:qr.fg_color, bgColor:qr.bg_color, margin:qr.margin,
+      dotStyle:qr.dot_style, cornerStyle:qr.corner_style,
+      caption:qr.caption, captionPos:qr.caption_pos,
+      captionColor:qr.caption_color, captionSize:qr.caption_size });
+    setEditing(qr.id);
+    setTab('create');
+  };
+
+  const inp = {...S.inp, fontSize:13, padding:'7px 9px', boxSizing:'border-box'};
+  const lbl = {color:'rgba(255,255,255,0.5)',fontFamily:'monospace',fontSize:10,marginBottom:3};
+
+  const tabs = [{id:'create',label:'✏️ Erstellen'},{id:'saved',label:`📋 Gespeichert (${saved.length})`}];
+
+  return (
+    <div>
+      <div style={{display:'flex',gap:6,marginBottom:18}}>
+        {tabs.map(t=>(
+          <button key={t.id} onClick={()=>setTab(t.id)} style={{
+            padding:'6px 16px',borderRadius:20,fontFamily:'monospace',fontSize:11,cursor:'pointer',
+            background:tab===t.id?'#4ecdc4':'rgba(255,255,255,0.05)',
+            color:tab===t.id?'#0d0d0f':'rgba(255,255,255,0.65)',
+            border:tab===t.id?'none':'1px solid rgba(255,255,255,0.12)',
+            fontWeight:tab===t.id?700:400}}>{t.label}</button>
+        ))}
+        {editing && <span style={{color:'#ffe66d',fontFamily:'monospace',fontSize:10,alignSelf:'center',marginLeft:4}}>● Bearbeitung</span>}
+      </div>
+
+      {tab==='create' && (
+        <div style={{display:'grid',gridTemplateColumns:mobile?'1fr':'1fr 1fr',gap:16,alignItems:'start'}}>
+          {/* Linke Spalte: Einstellungen */}
+          <div>
+            <div style={{marginBottom:10}}>
+              <div style={lbl}>Name / Bezeichnung</div>
+              <input style={{...inp,width:'100%'}} placeholder="z.B. Meine Webseite" value={form.label} onChange={e=>set('label',e.target.value)}/>
+            </div>
+            <div style={{marginBottom:10}}>
+              <div style={lbl}>URL / Inhalt *</div>
+              <input style={{...inp,width:'100%'}} placeholder="https://example.com" autoCapitalize="none" value={form.url} onChange={e=>set('url',e.target.value)}/>
+            </div>
+            <div style={{display:'grid',gridTemplateColumns:'1fr 1fr',gap:8,marginBottom:10}}>
+              <div>
+                <div style={lbl}>Größe (px)</div>
+                <select style={{...inp,width:'100%',cursor:'pointer'}} value={form.size} onChange={e=>set('size',parseInt(e.target.value))}>
+                  {QR_SIZES.map(s=><option key={s} value={s}>{s}×{s}</option>)}
+                </select>
+              </div>
+              <div>
+                <div style={lbl}>Rand (Module)</div>
+                <input type="number" min={0} max={10} style={{...inp,width:'100%'}} value={form.margin} onChange={e=>set('margin',parseInt(e.target.value)||0)}/>
+              </div>
+            </div>
+            <div style={{display:'grid',gridTemplateColumns:'1fr 1fr',gap:8,marginBottom:10}}>
+              <div>
+                <div style={lbl}>Punkte-Stil</div>
+                <select style={{...inp,width:'100%',cursor:'pointer'}} value={form.dotStyle} onChange={e=>set('dotStyle',e.target.value)}>
+                  {DOT_STYLES.map(d=><option key={d.id} value={d.id}>{d.label}</option>)}
+                </select>
+              </div>
+              <div>
+                <div style={lbl}>Ecken-Stil</div>
+                <select style={{...inp,width:'100%',cursor:'pointer'}} value={form.cornerStyle} onChange={e=>set('cornerStyle',e.target.value)}>
+                  {CORNER_STYLES.map(c=><option key={c.id} value={c.id}>{c.label}</option>)}
+                </select>
+              </div>
+            </div>
+            <div style={{display:'grid',gridTemplateColumns:'1fr 1fr',gap:8,marginBottom:10}}>
+              <div>
+                <div style={lbl}>Farbe (Punkte)</div>
+                <div style={{display:'flex',gap:6,alignItems:'center'}}>
+                  <input type="color" value={form.fgColor} onChange={e=>set('fgColor',e.target.value)}
+                    style={{width:38,height:34,borderRadius:6,border:'1px solid rgba(255,255,255,0.15)',cursor:'pointer',padding:2,background:'transparent'}}/>
+                  <input style={{...inp,flex:1,fontSize:11}} value={form.fgColor} onChange={e=>set('fgColor',e.target.value)}/>
+                </div>
+              </div>
+              <div>
+                <div style={lbl}>Hintergrund</div>
+                <div style={{display:'flex',gap:6,alignItems:'center'}}>
+                  <input type="color" value={form.bgColor} onChange={e=>set('bgColor',e.target.value)}
+                    style={{width:38,height:34,borderRadius:6,border:'1px solid rgba(255,255,255,0.15)',cursor:'pointer',padding:2,background:'transparent'}}/>
+                  <input style={{...inp,flex:1,fontSize:11}} value={form.bgColor} onChange={e=>set('bgColor',e.target.value)}/>
+                </div>
+              </div>
+            </div>
+            {/* Beschriftung */}
+            <div style={{padding:'10px 12px',borderRadius:8,background:'rgba(255,255,255,0.03)',
+              border:'1px solid rgba(255,255,255,0.07)',marginBottom:10}}>
+              <div style={{...lbl,marginBottom:8}}>BESCHRIFTUNG</div>
+              <div style={{marginBottom:8}}>
+                <div style={lbl}>Position</div>
+                <div style={{display:'flex',gap:5}}>
+                  {CAP_POS.map(p=>(
+                    <button key={p.id} onClick={()=>set('captionPos',p.id)} style={{
+                      padding:'4px 12px',borderRadius:16,fontFamily:'monospace',fontSize:10,cursor:'pointer',
+                      background:form.captionPos===p.id?'rgba(78,205,196,0.15)':'rgba(255,255,255,0.04)',
+                      border:`1px solid ${form.captionPos===p.id?'#4ecdc4':'rgba(255,255,255,0.12)'}`,
+                      color:form.captionPos===p.id?'#4ecdc4':'rgba(255,255,255,0.55)',fontWeight:form.captionPos===p.id?700:400}}>
+                      {p.label}
+                    </button>
+                  ))}
+                </div>
+              </div>
+              {form.captionPos !== 'none' && (
+                <>
+                  <input style={{...inp,width:'100%',marginBottom:8,boxSizing:'border-box'}} placeholder="Text der Beschriftung"
+                    value={form.caption} onChange={e=>set('caption',e.target.value)}/>
+                  <div style={{display:'grid',gridTemplateColumns:'1fr 1fr',gap:8}}>
+                    <div>
+                      <div style={lbl}>Farbe</div>
+                      <div style={{display:'flex',gap:5,alignItems:'center'}}>
+                        <input type="color" value={form.captionColor} onChange={e=>set('captionColor',e.target.value)}
+                          style={{width:34,height:30,borderRadius:5,border:'1px solid rgba(255,255,255,0.15)',cursor:'pointer',padding:1,background:'transparent'}}/>
+                        <input style={{...inp,flex:1,fontSize:10}} value={form.captionColor} onChange={e=>set('captionColor',e.target.value)}/>
+                      </div>
+                    </div>
+                    <div>
+                      <div style={lbl}>Schriftgröße</div>
+                      <input type="number" min={8} max={36} style={{...inp,width:'100%'}}
+                        value={form.captionSize} onChange={e=>set('captionSize',parseInt(e.target.value)||14)}/>
+                    </div>
+                  </div>
+                </>
+              )}
+            </div>
+            <div style={{display:'flex',gap:8}}>
+              <button onClick={download} disabled={!form.url.trim()}
+                style={{...S.btn('#ffe66d',true),flex:1,textAlign:'center',padding:'8px 0',opacity:form.url.trim()?1:0.4}}>
+                ↓ PNG laden
+              </button>
+              <button onClick={save} disabled={busy||!form.url.trim()}
+                style={{...S.btn('#4ecdc4'),flex:1,textAlign:'center',padding:'8px 0',opacity:form.url.trim()?1:0.4}}>
+                {busy?'…':editing?'✓ Aktualisieren':'💾 Speichern'}
+              </button>
+              {editing && <button onClick={()=>{setEditing(null);setForm(DEFAULTS);}}
+                style={{...S.btn('#ff6b9d',true),padding:'0 12px'}}>✕</button>}
+            </div>
+          </div>
+          {/* Rechte Spalte: Vorschau */}
+          <div style={{display:'flex',flexDirection:'column',alignItems:'center',gap:12}}>
+            <div style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:10}}>VORSCHAU</div>
+            {form.url.trim()
+              ? <canvas ref={canvasRef} style={{borderRadius:8,maxWidth:'100%',
+                  boxShadow:'0 4px 24px rgba(0,0,0,0.4)',border:'1px solid rgba(255,255,255,0.08)'}}/>
+              : <div style={{width:200,height:200,borderRadius:8,background:'rgba(255,255,255,0.04)',
+                  border:'1px solid rgba(255,255,255,0.08)',display:'flex',alignItems:'center',justifyContent:'center'}}>
+                  <span style={{color:'rgba(255,255,255,0.2)',fontFamily:'monospace',fontSize:11}}>URL eingeben →</span>
+                </div>
+            }
+            <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:9,textAlign:'center',lineHeight:1.6}}>
+              QR-Code wird lokal generiert<br/>Nichts wird ohne Speichern gespeichert
+            </div>
+          </div>
+        </div>
+      )}
+
+      {tab==='saved' && (
+        <div>
+          {saved.length===0
+            ? <div style={{color:'rgba(255,255,255,0.35)',fontFamily:'monospace',fontSize:11,padding:'20px 0',textAlign:'center'}}>
+                Noch keine QR-Codes gespeichert
+              </div>
+            : <div style={{display:'flex',flexDirection:'column',gap:8}}>
+                {saved.map(qr=>(
+                  <SavedQrCard key={qr.id} qr={qr} onEdit={editQr} onDelete={deleteQr} toast={toast}/>
+                ))}
+              </div>
+          }
+        </div>
+      )}
+    </div>
+  );
+}
+
+function SavedQrCard({ qr, onEdit, onDelete, toast }) {
+  const canvasRef = useRef(null);
+  const [expanded, setExpanded] = useState(false);
+
+  useEffect(()=>{
+    if (!expanded || !canvasRef.current) return;
+    drawQrToCanvas(canvasRef.current, qr.url, {
+      size: Math.min(qr.size, 192), fgColor:qr.fg_color, bgColor:qr.bg_color,
+      margin:qr.margin, dotStyle:qr.dot_style, cornerStyle:qr.corner_style,
+      caption:qr.caption, captionPos:qr.caption_pos,
+      captionColor:qr.caption_color, captionSize:qr.caption_size,
+    });
+  },[expanded, qr]);
+
+  const download = () => {
+    if (!canvasRef.current) return;
+    // Re-draw in full size for download
+    const tmp = document.createElement('canvas');
+    drawQrToCanvas(tmp, qr.url, {
+      size:qr.size, fgColor:qr.fg_color, bgColor:qr.bg_color,
+      margin:qr.margin, dotStyle:qr.dot_style, cornerStyle:qr.corner_style,
+      caption:qr.caption, captionPos:qr.caption_pos,
+      captionColor:qr.caption_color, captionSize:qr.caption_size,
+    }).then(()=>{
+      const a = document.createElement('a');
+      a.href = tmp.toDataURL('image/png');
+      a.download = `qrcode-${qr.label||qr.id}.png`;
+      a.click();
+    });
+  };
+
+  return (
+    <div style={{borderRadius:9,background:'rgba(255,255,255,0.03)',border:'1px solid rgba(255,255,255,0.07)',overflow:'hidden'}}>
+      <div style={{display:'flex',alignItems:'center',gap:10,padding:'10px 12px',cursor:'pointer'}}
+        onClick={()=>setExpanded(p=>!p)}>
+        <span style={{color:'rgba(255,255,255,0.3)',fontSize:11,width:14}}>{expanded?'▾':'▸'}</span>
+        <div style={{flex:1,minWidth:0}}>
+          <div style={{color:'#fff',fontFamily:'monospace',fontSize:13,fontWeight:700,
+            overflow:'hidden',textOverflow:'ellipsis',whiteSpace:'nowrap'}}>
+            {qr.label||'QR-Code'}
+          </div>
+          <div style={{color:'rgba(78,205,196,0.6)',fontFamily:'monospace',fontSize:10,
+            overflow:'hidden',textOverflow:'ellipsis',whiteSpace:'nowrap'}}>{qr.url}</div>
+        </div>
+        <div style={{display:'flex',gap:4}} onClick={e=>e.stopPropagation()}>
+          <button onClick={download} style={{...S.btn('#ffe66d',true),fontSize:10,padding:'4px 8px'}}>↓</button>
+          <button onClick={()=>onEdit(qr)} style={{...S.btn('#4ecdc4',true),fontSize:10,padding:'4px 8px'}}>✎</button>
+          <button onClick={()=>onDelete(qr.id)} style={{...S.btn('#ff6b9d',true),fontSize:10,padding:'4px 8px'}}>✕</button>
+        </div>
+      </div>
+      {expanded && (
+        <div style={{padding:'0 12px 12px',display:'flex',gap:14,flexWrap:'wrap',alignItems:'flex-start'}}>
+          <canvas ref={canvasRef} style={{borderRadius:6,flexShrink:0,
+            boxShadow:'0 2px 12px rgba(0,0,0,0.3)',border:'1px solid rgba(255,255,255,0.08)',maxWidth:192}}/>
+          <div style={{fontFamily:'monospace',fontSize:10,color:'rgba(255,255,255,0.45)',lineHeight:2}}>
+            {[['Größe',`${qr.size}×${qr.size}px`],['Punkte',qr.dot_style],['Ecken',qr.corner_style],
+              ['Rand',qr.margin],['Beschriftung',qr.caption||'—'],['Position',qr.caption_pos]].map(([k,v])=>(
+              <div key={k}><span style={{color:'rgba(255,255,255,0.25)'}}>{k}:</span> {v}</div>
+            ))}
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}
+
 
 const TOOL_DEFS = [
   {id:'cron',    label:'⏱ Crontab',   desc:'Crontab erklären und erstellen', ready:true,
@@ -2690,7 +3086,7 @@ const TOOL_DEFS = [
   {id:'netzwerk',  label:'🌐 Netzwerk',    desc:'IP, Subnetz, Geschwindigkeit, CIDR',   ready:true,  component:NetzwerkRechner},
   {id:'datetime',  label:'📅 Datetime',   desc:'Zeiten umrechnen · Geburtstag · Differenz', ready:true, component:DatetimeRechner},
   {id:'farben',    label:'🎨 Farben',     desc:'HEX, RGB, HSL, OKLCH umrechnen',  ready:true, component:FarbRechner},
-  {id:'keygen',    label:'🔐 Key-Gen',    desc:'Sichere Keys & Secrets generieren',  ready:true, component:KeyGen},
+  {id:'qrcode',    label:'◻ QR-Code',     desc:'QR-Codes erstellen & verwalten',     ready:true, component:QrGenerator},
 ];
 
 export default function DevTools({ toast, mobile }) {

frontend/src/tools/linkliste.jsx

@@ -11,6 +11,55 @@ function extIcon(url) {
 
 function isMob() { return window.innerWidth < 768; }
 
+// ── Folder Share Modal ────────────────────────────────────────────────────────
+function FolderShareModal({ folder, onClose, toast }) {
+  const [username, setUsername] = useState('');
+  const [shares,   setShares]   = useState([]);
+  const load = () => api(`/tools/linkliste/folders/${folder.id}/shares`).then(setShares).catch(()=>{});
+  useEffect(()=>{ load(); },[]);
+  const share   = async () => {
+    if (!username.trim()) return;
+    try { await api(`/tools/linkliste/folders/${folder.id}/share`,{body:{username:username.trim()}}); toast('Geteilt ✓'); setUsername(''); load(); }
+    catch(e) { toast(e.message,'error'); }
+  };
+  const unshare = async uid => {
+    try { await api(`/tools/linkliste/folders/${folder.id}/share/${uid}`,{method:'DELETE'}); setShares(p=>p.filter(s=>s.id!==uid)); }
+    catch(e) { toast(e.message,'error'); }
+  };
+  const mob = isMob();
+  return (
+    <div style={{position:'fixed',inset:0,background:'rgba(0,0,0,0.8)',zIndex:6000,
+      display:'flex',alignItems:mob?'flex-end':'center',justifyContent:'center',padding:mob?0:24}}
+      onClick={e=>e.target===e.currentTarget&&onClose()}>
+      <div style={{background:'#1a1a1e',borderRadius:mob?'16px 16px 0 0':14,width:'100%',maxWidth:400,
+        padding:'20px 20px 28px',border:'1px solid rgba(255,255,255,0.12)'}}>
+        {mob&&<div style={{width:36,height:4,background:'rgba(255,255,255,0.15)',borderRadius:2,margin:'0 auto 14px'}}/>}
+        <div style={{display:'flex',justifyContent:'space-between',alignItems:'center',marginBottom:10}}>
+          <div style={{color:'#fff',fontFamily:"'Space Mono',monospace",fontSize:13,fontWeight:700}}>
+            🤝 {folder.icon} {folder.name}
+          </div>
+          <button onClick={onClose} style={{background:'transparent',border:'none',color:'rgba(255,255,255,0.4)',cursor:'pointer',fontSize:18}}>✕</button>
+        </div>
+        <div style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:10,marginBottom:10}}>
+          Ganzer Ordner inkl. aller Links wird geteilt
+        </div>
+        <div style={{display:'flex',gap:8,marginBottom:14}}>
+          <input value={username} onChange={e=>setUsername(e.target.value)} onKeyDown={e=>e.key==='Enter'&&share()}
+            placeholder="Benutzername" autoCapitalize="none" style={{...S.inp,flex:1}}/>
+          <button onClick={share} style={S.btn('#4ecdc4')}>Teilen</button>
+        </div>
+        {shares.length>0 ? shares.map(s=>(
+          <div key={s.id} style={{display:'flex',justifyContent:'space-between',alignItems:'center',
+            padding:'8px 0',borderBottom:'1px solid rgba(255,255,255,0.05)'}}>
+            <span style={{color:'rgba(255,255,255,0.7)',fontFamily:'monospace',fontSize:13}}>{s.username}</span>
+            <button onClick={()=>unshare(s.id)} style={S.btn('#ff6b9d',true)}>✕</button>
+          </div>
+        )) : <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:11}}>Noch mit niemandem geteilt.</div>}
+      </div>
+    </div>
+  );
+}
+
 // ── Share Modal ───────────────────────────────────────────────────────────────
 function ShareModal({ link, onClose, toast }) {
   const [username, setUsername] = useState('');
@@ -149,19 +198,22 @@ export default function Linkliste({ toast, mobile }) {
   const [folders,   setFolders]   = useState([]);
   const [shared,    setShared]    = useState([]);
   const [byMe,      setByMe]      = useState([]);
+  const [sharedFolders,   setSharedFolders]   = useState([]);
+  const [sharedFoldersByMe, setSharedFoldersByMe] = useState([]);
   const [tab,       setTab]       = useState('own');
   const [showForm,  setShowForm]  = useState(false);
   const [showFolderForm, setShowFolderForm] = useState(false);
   const [editItem,  setEditItem]  = useState(null);
   const [editFolder,setEditFolder]= useState(null);
   const [shareItem, setShareItem] = useState(null);
+  const [shareFolderItem, setShareFolderItem] = useState(null);
   const [search,    setSearch]    = useState('');
   const [expanded,  setExpanded]  = useState({}); // folder_id → bool
   const [sortMode,  setSortMode]  = useState(false);
   const dragRef = useRef(null);
 
   const load = () => api('/tools/linkliste')
-    .then(d=>{ setOwn(d.own||[]); setFolders(d.folders||[]); setShared(d.shared||[]); setByMe(d.sharedByMe||[]); })
+    .then(d=>{ setOwn(d.own||[]); setFolders(d.folders||[]); setShared(d.shared||[]); setByMe(d.sharedByMe||[]); setSharedFolders(d.sharedFolders||[]); setSharedFoldersByMe(d.sharedFoldersByMe||[]); })
     .catch(()=>{});
 
   useEffect(()=>{ load(); },[]);
@@ -400,6 +452,7 @@ export default function Linkliste({ toast, mobile }) {
                   <QABadge active={!!folder.in_quickaccess}/> Schnellzugriff
                 </button>
                 <button onClick={()=>setEditFolder(folder)} style={{...S.btn('#4ecdc4',true),fontSize:10,padding:'4px 10px'}}>✎</button>
+                <button onClick={()=>setShareFolderItem(folder)} style={{...S.btn('#ffe66d',true),fontSize:10,padding:'4px 10px'}}>🤝</button>
                 <button onClick={()=>deleteFolder(folder.id)} style={{...S.btn('#ff6b9d',true),fontSize:10,padding:'4px 10px'}}>✕</button>
               </div>
             )}
@@ -433,6 +486,7 @@ export default function Linkliste({ toast, mobile }) {
   return (
     <div style={{padding:mobile?'14px 14px 90px':'36px 44px',maxWidth:760}}>
       {shareItem && <ShareModal link={shareItem} onClose={()=>{setShareItem(null);load();}} toast={toast}/>}
+      {shareFolderItem && <FolderShareModal folder={shareFolderItem} onClose={()=>{setShareFolderItem(null);load();}} toast={toast}/>}
 
       {/* Header */}
       <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',marginBottom:14,gap:8,flexWrap:'wrap'}}>
@@ -511,9 +565,33 @@ export default function Linkliste({ toast, mobile }) {
         </div>
       )}
       {tab==='shared' && (
-        filteredShared.length===0
-          ? <div style={{...S.card,textAlign:'center',padding:40}}><div style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:12}}>Nichts geteilt.</div></div>
-          : filteredShared.map(link=><LinkCard key={link.id} link={link} isShared/>)
+        <div>
+          {/* Geteilte Ordner */}
+          {sharedFolders.map(folder=>(
+            <div key={`sf-${folder.id}`} style={{marginBottom:8}}>
+              <div style={{...S.card,padding:'10px 12px',borderRadius:'10px 10px 0 0',
+                borderBottom:'1px solid rgba(255,255,255,0.06)'}}>
+                <div style={{display:'flex',alignItems:'center',gap:10}}>
+                  <span style={{fontSize:18}}>{folder.icon}</span>
+                  <div style={{flex:1}}>
+                    <span style={{color:'#fff',fontFamily:'monospace',fontSize:13,fontWeight:700}}>{folder.name}</span>
+                    <span style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:9,marginLeft:8}}>von {folder.owner_name}</span>
+                  </div>
+                </div>
+              </div>
+              <div style={{background:'rgba(255,255,255,0.02)',border:'1px solid rgba(255,255,255,0.07)',
+                borderTop:'none',borderRadius:'0 0 10px 10px',padding:'8px 8px 4px'}}>
+                {(folder.links||[]).map(link=><LinkCard key={link.id} link={link} isShared/>)}
+                {(!folder.links||folder.links.length===0) && <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:11,padding:'8px',textAlign:'center'}}>Ordner ist leer</div>}
+              </div>
+            </div>
+          ))}
+          {/* Einzelne Links */}
+          {filteredShared.map(link=><LinkCard key={link.id} link={link} isShared/>)}
+          {sharedFolders.length===0&&filteredShared.length===0 && (
+            <div style={{...S.card,textAlign:'center',padding:40}}><div style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:12}}>Nichts geteilt.</div></div>
+          )}
+        </div>
       )}
       {tab==='byMe' && (
         filteredByMe.length===0