fixes: collab move, caldav abort, draft recovery, autobackup, test stabilization

- Collab: moving a shared card to a local bucket no longer deletes it
  (clear relay_uid before tombstone echo returns)
- CalDAV: abort sync on remote fetch failure instead of treating all
  local cards as remotely-deleted
- Editor: autobackup drafts to localStorage with restore prompt on
  re-open (skipped during tests)
- Cards POST: persist scratchpad and due_date (was dropped on create)
- Disable spellcheck/autocorrect on editor inputs
- Test runner: purge leftover __prefix__ cards/buckets + editor drafts
  before every run (cleans up from failed previous runs)
- Stabilize mark-done, group-delete, undo-body tests with poll loops

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/js/modules/editor.js

@@ -13,6 +13,8 @@ const inpTitle = $('inp-title');
 const inpColor = $('inp-color');
 const inpBucket = $('inp-bucket');
 const presets = $('color-presets');
+const scratchpadPanel = $('editor-scratchpad');
+const scratchpadBody = $('scratchpad-body');
 const linkAc = $('link-ac');
 const tagAc = $('tag-ac');
 
@@ -176,6 +178,45 @@ function selectColor(hex) {
 
 // ── Open / close ──
 
+// ── Autobackup (draft recovery) ──
+const DRAFT_KEY = 'hyprcrd-editor-draft';
+let draftSaveTimer = null;
+
+function draftKeyFor(cardId) {
+    return DRAFT_KEY + ':' + (cardId || 'new');
+}
+
+function loadDraft(cardId) {
+    try {
+        const raw = localStorage.getItem(draftKeyFor(cardId));
+        return raw ? JSON.parse(raw) : null;
+    } catch { return null; }
+}
+
+function saveDraftDebounced() {
+    clearTimeout(draftSaveTimer);
+    draftSaveTimer = setTimeout(() => {
+        const id = state.editingId || 'new';
+        const data = {
+            title: inpTitle.value,
+            body: body.value,
+            scratchpad: scratchpadBody?.value || '',
+            savedAt: Date.now(),
+        };
+        // Don't store empty drafts
+        if (!data.title.trim() && !data.body.trim() && !data.scratchpad.trim()) {
+            localStorage.removeItem(draftKeyFor(id));
+            return;
+        }
+        try { localStorage.setItem(draftKeyFor(id), JSON.stringify(data)); } catch {}
+    }, 800);
+}
+
+function clearDraft(cardId) {
+    clearTimeout(draftSaveTimer);
+    try { localStorage.removeItem(draftKeyFor(cardId || 'new')); } catch {}
+}
+
 export function openModal(card = null) {
     state.editingId = card ? card.id : null;
     $('modal-title').textContent = card ? 'edit_card' : 'new_card';
@@ -195,15 +236,44 @@ export function openModal(card = null) {
     if (linesVisible) updateGutter();
     currentLine = -1;
     updateActiveLine();
+
+    // Check for unsaved draft (newer than what we just loaded).
+    // Skipped during test runs — tests would block on the confirm dialog.
+    const draft = loadDraft(card?.id);
+    if (draft && !window._testRunning) {
+        const cardModified = card ? Date.parse(card.updated_at + 'Z') || 0 : 0;
+        const draftIsNewer = draft.savedAt > cardModified;
+        const draftHasContent = draft.title || draft.body || draft.scratchpad;
+        const differsFromLoaded = draft.title !== inpTitle.value || draft.body !== body.value || draft.scratchpad !== (scratchpadBody?.value || '');
+        if (draftIsNewer && draftHasContent && differsFromLoaded) {
+            const age = Math.round((Date.now() - draft.savedAt) / 60000);
+            const ageText = age < 1 ? 'just now' : age < 60 ? `${age} min ago` : `${Math.round(age / 60)} h ago`;
+            const restore = window.confirm(`Unsaved draft from ${ageText} found.\n\nRestore it?`);
+            if (restore) {
+                inpTitle.value = draft.title || '';
+                body.value = draft.body || '';
+                if (scratchpadBody) scratchpadBody.value = draft.scratchpad || '';
+                updatePreview();
+            } else {
+                clearDraft(card?.id);
+            }
+        }
+    } else if (draft && window._testRunning) {
+        // During tests, silently discard any draft so it doesn't accumulate
+        clearDraft(card?.id);
+    }
+
     inpTitle.focus();
     // Plugins (collab-buckets) hook into this to heartbeat an edit lock
     window.dispatchEvent(new CustomEvent('hyprcrd:editor-open', { detail: { card } }));
 }
 
-inpTitle.addEventListener('input', updatePreview);
+inpTitle.addEventListener('input', () => { updatePreview(); saveDraftDebounced(); });
 inpTitle.addEventListener('keydown', e => {
     if (e.key === 'Tab' && !e.shiftKey) { e.preventDefault(); body.focus(); }
 });
+body.addEventListener('input', saveDraftDebounced);
+scratchpadBody?.addEventListener('input', saveDraftDebounced);
 
 // ── Line numbers ──
 
@@ -396,10 +466,12 @@ async function doSave(close, { animate = true } = {}) {
     const data = { title: inpTitle.value, body: body.value, color: inpColor.value, bucket_id: inpBucket.value || null, due_date: inpDueValue?.value || null, scratchpad: scratch };
     if (!data.title.trim()) return;
     const returnToGallery = state.returnToGalleryAfterEdit;
+    const wasEditingId = state.editingId;
     if (state.editingId) {
         const prev = snapshotCard(state.cards.find(c => c.id == state.editingId));
         if (prev) pushCardEdit('edit', state.editingId, { title: prev.title, body: prev.body, color: prev.color, bucket_id: prev.bucket_id, due_date: prev.due_date ?? null });
         await api(`api/cards/${state.editingId}`, { method: 'PATCH', body: data });
+        clearDraft(state.editingId);
     } else {
         if (state.activeGroup) {
             const parent = state.cards.find(c => c.id == state.activeGroup);
@@ -416,6 +488,7 @@ async function doSave(close, { animate = true } = {}) {
             state._lastSavedId = created.id;
             state.recentlyCreatedIds?.add(String(created.id));
         }
+        clearDraft(null); // 'new' draft
     }
     await window._reloadAll();
     // Auto-sync if card has #termin or #geburtstag
@@ -533,9 +606,6 @@ function applyEditorSplit() {
     preview.style.flex = `${100 - editorSplit} 1 0`;
 }
 
-const scratchpadPanel = $('editor-scratchpad');
-const scratchpadBody = $('scratchpad-body');
-
 function showSidePanel(which) {
     const showPreview = which === 'preview';
     const showScratch = which === 'scratchpad';