PWA: Dokumente (PDFs) in Mehrfachauswahl + Back-Button schließt Auswahl [deploy]

- PDFs/Dokumente lassen sich jetzt auch im Auswahl-Modus markieren und
  mitteilen (bisher öffnete der Tap immer den Viewer)
- ☑ Auswählen-Button erscheint auch wenn nur Dokumente vorhanden sind
- Android-Zurück-Button im Select-Modus: hebt die Auswahl auf und
  beendet den Auswahl-Modus (statt die Seite zu verlassen)
- ✕ Abbrechen-Button nutzt denselben History-Back-Pfad

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app.css

@@ -352,6 +352,30 @@ body {
     border-color: #fff;
 }
 
+/* Auswahl-Mode in der Dokumenten-Liste (PDFs etc.) */
+.doc-item .doc-check {
+    display: none;
+    width: 22px;
+    height: 22px;
+    border-radius: 50%;
+    background: transparent;
+    border: 2px solid #888;
+    color: transparent;
+    font-size: 14px;
+    font-weight: bold;
+    align-items: center;
+    justify-content: center;
+    flex-shrink: 0;
+}
+.doc-list.selecting .doc-item .doc-check { display: flex; }
+.doc-list.selecting .doc-item .doc-open { pointer-events: none; opacity: 0.4; }
+.doc-list.selecting .doc-item.selected { background: rgba(90,176,255,0.15); outline: 2px solid #5ab0ff; }
+.doc-list.selecting .doc-item.selected .doc-check {
+    background: #5ab0ff;
+    border-color: #5ab0ff;
+    color: #fff;
+}
+
 /* Sticky Aktions-Bar am unteren Bildschirmrand */
 .select-bar {
     position: fixed;

app.js

@@ -45,6 +45,9 @@ function setBack(visible, hash) {
 const modalStack = [];
 let _skipNextPopstate = false;
 let _lastBackAt = 0;
+// Aktiver Select-Mode-Cleanup: wird von popstate gerufen, damit Android-Back
+// eine laufende Mehrfachauswahl beendet statt die Seite zu verlassen.
+let selectModeCleanup = null;
 
 function pushModal(el, cleanup) {
     modalStack.push({ el, cleanup: cleanup || null });
@@ -83,6 +86,12 @@ window.addEventListener('popstate', () => {
         try { top.cleanup && top.cleanup(); } catch {}
         return;
     }
+    if (selectModeCleanup) {
+        const fn = selectModeCleanup;
+        selectModeCleanup = null;
+        try { fn(); } catch {}
+        return;
+    }
     if (isTopLevelHash(location.hash)) {
         const now = Date.now();
         if (now - _lastBackAt < 2000) return;
@@ -535,7 +544,7 @@ router.on('/orders/:id', async (args) => {
             <div class="detail-section" style="margin-top:16px;">
                 <div class="photo-section-head">
                     <h3 style="margin:0;">Hochgeladene Fotos (${imagePhotos.length})</h3>
-                    ${imagePhotos.length ? '<button class="btn btn-small" id="btn-select-mode" title="Mehrfachauswahl">☑ Auswählen</button>' : ''}
+                    ${(imagePhotos.length + otherDocs.length) ? '<button class="btn btn-small" id="btn-select-mode" title="Mehrfachauswahl">☑ Auswählen</button>' : ''}
                 </div>
                 <div class="photo-grid" id="photo-grid">
                     ${imagePhotos.map(p => `<div class="thumb" data-relpath="${escapeHtml(p.relpath)}"><div class="thumb-placeholder">⏳</div><div class="thumb-check">✓</div></div>`).join('')}
@@ -558,6 +567,7 @@ router.on('/orders/:id', async (args) => {
                 <h3>Weitere Dokumente (${otherDocs.length})</h3>
                 <div class="doc-list">
                     ${otherDocs.map(p => `<div class="doc-item" data-relpath="${escapeHtml(p.relpath)}" data-mime="${escapeHtml(p.mime || '')}" data-filename="${escapeHtml(p.filename)}">
+                        <div class="doc-check">✓</div>
                         <span class="doc-icon">${docIconFor(p.filename, p.mime)}</span>
                         <div class="doc-meta">
                             <div class="doc-name">${escapeHtml(p.filename)}</div>
@@ -571,6 +581,7 @@ router.on('/orders/:id', async (args) => {
 
         // Foto-Thumbnails: Tap = Vollbild-Modal (oder Auswahl im Select-Modus)
         const photoGrid = document.getElementById('photo-grid');
+        const docList = document.querySelector('.doc-list');
         photoGrid.querySelectorAll('.thumb').forEach(t => {
             t.addEventListener('click', () => {
                 if (photoGrid.classList.contains('selecting')) {
@@ -586,17 +597,33 @@ router.on('/orders/:id', async (args) => {
         const selectBtn = document.getElementById('btn-select-mode');
         if (selectBtn) selectBtn.onclick = () => startSelectMode();
 
+        function allSelectables() {
+            const thumbs = Array.from(photoGrid.querySelectorAll('.thumb[data-relpath]'));
+            const docs = docList ? Array.from(docList.querySelectorAll('.doc-item[data-relpath]')) : [];
+            return thumbs.concat(docs);
+        }
         function startSelectMode() {
+            if (photoGrid.classList.contains('selecting')) return;
             photoGrid.classList.add('selecting');
+            if (docList) docList.classList.add('selecting');
             renderSelectBar();
             updateSelectBar();
+            // Android-Back soll nur die Auswahl aufheben
+            history.pushState({ _selecting: true }, '', location.hash);
+            selectModeCleanup = endSelectMode;
         }
         function endSelectMode() {
+            selectModeCleanup = null;
             photoGrid.classList.remove('selecting');
-            photoGrid.querySelectorAll('.thumb.selected').forEach(x => x.classList.remove('selected'));
+            if (docList) docList.classList.remove('selecting');
+            allSelectables().forEach(x => x.classList.remove('selected'));
             const bar = document.getElementById('select-bar');
             if (bar) bar.remove();
         }
+        function cancelViaBack() {
+            if (history.state && history.state._selecting) history.back();
+            else endSelectMode();
+        }
         function renderSelectBar() {
             if (document.getElementById('select-bar')) return;
             const bar = document.createElement('div');
@@ -609,42 +636,50 @@ router.on('/orders/:id', async (args) => {
                 <button class="icon-btn" id="sb-share" title="Teilen" disabled>📤</button>
             `;
             document.body.appendChild(bar);
-            bar.querySelector('#sb-cancel').onclick = endSelectMode;
+            bar.querySelector('#sb-cancel').onclick = cancelViaBack;
             bar.querySelector('#sb-all').onclick = () => {
-                const thumbs = photoGrid.querySelectorAll('.thumb[data-relpath]');
-                const anyUn = Array.from(thumbs).some(t => !t.classList.contains('selected'));
-                thumbs.forEach(t => t.classList.toggle('selected', anyUn));
+                const items = allSelectables();
+                const anyUn = items.some(t => !t.classList.contains('selected'));
+                items.forEach(t => t.classList.toggle('selected', anyUn));
                 updateSelectBar();
             };
             bar.querySelector('#sb-share').onclick = () => shareSelected();
         }
         function updateSelectBar() {
-            const n = photoGrid.querySelectorAll('.thumb.selected').length;
+            const n = allSelectables().filter(x => x.classList.contains('selected')).length;
             const info = document.getElementById('sb-info');
             const share = document.getElementById('sb-share');
             if (info) info.textContent = n + ' ausgewählt';
             if (share) share.disabled = n === 0;
         }
         async function shareSelected() {
-            const sel = Array.from(photoGrid.querySelectorAll('.thumb.selected'));
+            const sel = allSelectables().filter(x => x.classList.contains('selected'));
             if (!sel.length) return;
-            showToast('Lade ' + sel.length + ' Foto' + (sel.length === 1 ? '' : 's') + '…');
+            showToast('Lade ' + sel.length + ' Datei' + (sel.length === 1 ? '' : 'en') + '…');
             const items = [];
             for (const t of sel) {
                 const rp = t.dataset.relpath;
                 try {
                     const f = await api.getFileBlobUrl(rp);
-                    if (f) items.push({ blob: f.blob, filename: rp.split('/').pop(), mime: f.mime });
+                    if (f) items.push({ blob: f.blob, filename: t.dataset.filename || rp.split('/').pop(), mime: f.mime });
                 } catch (e) { console.warn('Share-Load', rp, e); }
             }
             if (!items.length) { showToast('Keine Dateien geladen', 'error'); return; }
-            const ok = await shareFiles(items, 'Fotos vom Auftrag');
-            if (ok) endSelectMode();
+            const ok = await shareFiles(items, 'Dateien vom Auftrag');
+            if (ok) cancelViaBack();
         }
 
-        // Weitere Dokumente: Tap = Öffnen (PDF inline, sonst Download)
+        // Weitere Dokumente: Tap = Öffnen (oder Auswahl im Select-Modus)
         document.querySelectorAll('.doc-list .doc-item').forEach(el => {
-            el.addEventListener('click', async () => {
+            el.addEventListener('click', async (e) => {
+                if (docList && docList.classList.contains('selecting')) {
+                    // Auch Klick auf Öffnen-Button soll nur selektieren
+                    e.preventDefault();
+                    e.stopPropagation();
+                    el.classList.toggle('selected');
+                    updateSelectBar();
+                    return;
+                }
                 const rel = el.dataset.relpath;
                 const filename = el.dataset.filename;
                 el.classList.add('loading');