feat(classifier): workspaces — scan-once, resume from snapshot (phase 6)

The classifier re-scanned the source on every session; on cloud-backed mounts
(OneDrive/Samba) that's minutes of per-op latency. Workspaces fix it: scan a
folder ONCE, snapshot the completed tree, and resume instantly — all
classification runs on the data model; the filesystem is only touched at copy.

- persist.js v2: multi-workspace IndexedDB (tiny 'index' store for the welcome
  list + 'data' store holding the source handle, tree snapshot, and map). DB v2.
- scanner.js: snapshotTree()/loadSnapshot() (compact, handle-less, marked done,
  totals recomputed) + lazy resolveFileHandle/resolveDirHandle from the root.
- workspace.js: welcome manager (new/open/rename/delete), debounced autosave of
  the active workspace, 'Refresh from disk' (re-scan → re-snapshot, path-keyed
  map carries over). New workspace = the one slow full scan; reopen = instant.
- copy.js: resolves snapshot files' handles from the workspace root with a
  one-click read permission re-grant; missing-on-disk files surface as errors.
- app.js: enterAppShell() shared by rename/workspace flows; exposes setMode;
  classify.js decoupled from persistence.
- template/css: welcome workspace list + header 'Workspaces' button.
- tests: snapshot round-trip, persist CRUD + classify-only-preserves-tree,
  copy-from-snapshot via mock root handle (28 classify/classifier tests green).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

classifier/build.sh

@@ -53,6 +53,7 @@ concat_files \
   "js/store.js" \
   "js/persist.js" \
   "js/classify.js" \
+  "js/workspace.js" \
   "js/dnd.js" \
   "js/validator.js" \
   "js/scanner.js" \

classifier/css/layout.css

@@ -265,6 +265,24 @@
     margin-left: 1.5rem;
 }
 
+/* ── Workspaces (welcome manager) ──────────────────────────────────────── */
+.workspaces { text-align: left; margin: 1rem 0; }
+.ws-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
+.ws-head h3 { margin: 0; font-size: 1.05rem; }
+.ws-intro { font-size: 0.85rem; color: var(--text-muted); margin: 0.4rem 0 0.75rem; }
+.ws-list { display: flex; flex-direction: column; gap: 0.4rem; }
+.ws-empty { color: var(--text-muted); font-size: 0.85rem; padding: 0.75rem; border: 1px dashed var(--border); border-radius: var(--radius); }
+.ws-row {
+    display: flex; align-items: center; gap: 0.75rem;
+    padding: 0.6rem 0.75rem; border: 1px solid var(--border); border-radius: var(--radius);
+    background: var(--bg);
+}
+.ws-row__main { flex: 1; min-width: 0; }
+.ws-row__name { font-weight: 600; }
+.ws-row__meta { font-size: 0.78rem; color: var(--text-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.ws-row__actions { display: flex; gap: 0.3rem; flex-shrink: 0; }
+.ws-or { font-size: 0.82rem; color: var(--text-muted); margin: 1rem 0 0.5rem; }
+
 /* ── Workflow mode switch (header) ─────────────────────────────────────── */
 .mode-switch {
     display: inline-flex;

classifier/js/app.js

@@ -33,22 +33,8 @@
         cacheDOMElements();
         setupEventListeners();
 
-        // Restore a saved Classify & Copy map (placements + target trees). It
+        // Workspace manager (renders the welcome list, owns new/open/autosave).
-        // keys on source-relative paths, so it re-attaches once the SAME source
+        if (app.modules.workspace) app.modules.workspace.init();
-        // directory is opened again — the source handle itself can't be opened
-        // without a user gesture, so we remind the user to re-pick it.
-        if (app.modules.persist && app.modules.persist.available) {
-            app.modules.persist.loadState().then(function (s) {
-                if (!s) return;
-                var has = Object.keys(s.assignments || {}).length
-                    || (s.trackingTree || []).length || (s.transmittalTree || []).length;
-                if (!has) return;
-                app.modules.classify.load(s);
-                if (window.zddc && window.zddc.toast) {
-                    window.zddc.toast('Restored your Classify & Copy map from this browser. Open the SAME source directory and switch to “Classify & Copy” to continue.', 'info', { durationMs: 9000 });
-                }
-            });
-        }
 
         // Browser-compatibility branch:
         //   HTTP mode (served by zddc-server) — works everywhere; the
@@ -368,31 +354,32 @@
     /**
      * Open a directory handle and initialize the application
      */
-    async function openDirectory(dirHandle) {
+    // Show the main UI and initialize the per-tool modules ONCE. Shared by the
-        app.rootHandle = dirHandle;
+    // legacy rename open and the workspace open/new flows (the latter scan or
-        // Remember the source handle so a later session can re-grant access in
+    // load a snapshot themselves).
-        // one click (the map re-attaches by relative path either way).
+    var shellInited = false;
-        if (app.modules.persist) app.modules.persist.saveSourceHandle(dirHandle);
+    function enterAppShell() {
-
-        // Hide welcome screen and show main UI
         hideWelcomeScreen();
         showMainUI();
+        if (!shellInited) {
+            shellInited = true;
+            app.modules.spreadsheet.init();  // Subscribe to store
+            app.modules.selection.init();
+            app.modules.preview.init();      // After selection so it can listen for rowfocused
+            app.modules.resize.init();
+            app.modules.filter.init();
+            app.modules.sort.init();
+            app.modules.tree.setupKeyboardShortcuts();
+            if (app.modules.targetTree) app.modules.targetTree.init();
+        }
+        if (app.dom.refreshHeaderBtn) app.dom.refreshHeaderBtn.classList.remove('hidden');
+    }
 
-        // Initialize modules BEFORE scanning (so they're ready for store updates)
+    async function openDirectory(dirHandle) {
-        app.modules.spreadsheet.init();  // Subscribe to store
+        app.rootHandle = dirHandle;
-        app.modules.selection.init();
+        enterAppShell();
-        app.modules.preview.init();  // After selection so it can listen for rowfocused
-        app.modules.resize.init();
-        app.modules.filter.init();
-        app.modules.sort.init();
-        app.modules.tree.setupKeyboardShortcuts();
-        if (app.modules.targetTree) app.modules.targetTree.init();
-
         // Now scan directory (this will trigger store updates and renders)
         await app.modules.scanner.scanDirectory(dirHandle);
-        
-        // Show refresh button now that a directory is loaded
-        if (app.dom.refreshHeaderBtn) { app.dom.refreshHeaderBtn.classList.remove('hidden'); }
     }
 
     /**
@@ -405,6 +392,16 @@
         }
 
         try {
+            // A snapshot-loaded workspace handle needs its read permission
+            // re-granted before we can enumerate it again.
+            if (app.modules.persist && app.modules.persist.verifyPermission) {
+                const ok = await app.modules.persist.verifyPermission(app.rootHandle, false);
+                if (!ok) {
+                    if (window.zddc) window.zddc.toast('Permission to read the source directory was denied.', 'error');
+                    return;
+                }
+            }
+
             // Clear current data
             app.folderTree = [];
             app.selectedFolders.clear();
@@ -416,6 +413,12 @@
             // Rescan directory (modules already initialized, just rescan)
             await app.modules.scanner.scanDirectory(app.rootHandle);
 
+            // For a workspace, persist the refreshed snapshot (additive: the
+            // path-keyed map re-attaches; new files appear unassigned).
+            if (app.modules.workspace && app.modules.workspace.onRescanned) {
+                app.modules.workspace.onRescanned();
+            }
+
         } catch (err) {
             console.error('Error refreshing directory:', err);
             alert('Error refreshing directory: ' + err.message);
@@ -551,7 +554,9 @@
 
     // Export functions for use by other modules
     app.modules.app = {
-        updateStats
+        updateStats,
+        setMode,
+        enterAppShell
     };
 
     // Initialize when DOM is ready

classifier/js/classify.js

@@ -47,6 +47,9 @@
     var notifyScheduled = false;
     function notify() {
         // Coalesce bursts (a group-drop touches many keys) into one render.
+        // Listeners include the target/source re-renders AND the workspace
+        // autosave (workspace.js subscribes) — persistence is not this
+        // module's concern.
         if (notifyScheduled) return;
         notifyScheduled = true;
         Promise.resolve().then(function () {
@@ -54,21 +57,9 @@
             for (var i = 0; i < listeners.length; i++) {
                 try { listeners[i](); } catch (e) { console.error('classify listener', e); }
             }
-            scheduleSave();
         });
     }
 
-    // ── persistence hook (debounced) ─────────────────────────────────────────
-    var saveTimer = null;
-    function scheduleSave() {
-        if (!window.app.modules.persist) return;
-        if (saveTimer) clearTimeout(saveTimer);
-        saveTimer = setTimeout(function () {
-            saveTimer = null;
-            try { window.app.modules.persist.saveState(serialize()); } catch (e) { console.warn('persist', e); }
-        }, 400);
-    }
-
     // ── source keys + title derivation ───────────────────────────────────────
     function stripRoot(p) {
         var i = (p || '').indexOf('/');
@@ -429,6 +420,6 @@
         // persistence
         serialize: serialize, load: load, reset: reset,
         getOutputName: function () { return state.outputName; },
-        setOutputName: function (n) { state.outputName = n || null; scheduleSave(); },
+        setOutputName: function (n) { state.outputName = n || null; notify(); },
     };
 })();

classifier/js/copy.js

@@ -90,13 +90,21 @@
 
     async function sameContent(existingHandle, srcFileObj) {
         var ef = await existingHandle.getFile();
-        var sf = await srcFileObj.handle.getFile();
+        var sf = await (await srcHandle(srcFileObj)).getFile();
         if (ef.size !== sf.size) return false;
         var a = await window.zddc.crypto.sha256File(ef);
         var b = await window.zddc.crypto.sha256File(sf);
         return a === b;
     }
 
+    // Resolve a source file's live handle. Fresh-scan files already carry one;
+    // snapshot-loaded files resolve lazily from the workspace root by path.
+    async function srcHandle(fileObj) {
+        if (fileObj.handle) return fileObj.handle;
+        if (!window.app.rootHandle) throw new Error('source directory not connected');
+        return window.app.modules.scanner.resolveFileHandle(window.app.rootHandle, fileObj);
+    }
+
     // Copy one file. Returns 'copied' | 'skipped' (identical) | 'differ' (left alone).
     async function copyOne(out, p) {
         var dir = await ensureDir(out, p.d.outPath);
@@ -105,7 +113,7 @@
         if (existing) {
             return (await sameContent(existing, p.file)) ? 'skipped' : 'differ';
         }
-        var srcFile = await p.file.handle.getFile();   // READ source (never write it)
+        var srcFile = await (await srcHandle(p.file)).getFile();   // READ source (never write it)
         var fh = await dir.getFileHandle(p.d.filename, { create: true });
         var w = await fh.createWritable();
         await w.write(srcFile);
@@ -131,6 +139,17 @@
         }
         if (!todo.length) return;
 
+        // Snapshot-loaded files have no live handle — re-grant read on the
+        // workspace source directory (one click) before copying.
+        if (todo.some(function (p) { return !p.file.handle; })) {
+            if (!window.app.rootHandle) {
+                toast('The source directory isn’t connected. Re-open the workspace to reconnect it.', 'error');
+                return;
+            }
+            var srcOk = await window.app.modules.persist.verifyPermission(window.app.rootHandle, false);
+            if (!srcOk) { toast('Permission to read the source directory was denied.', 'error'); return; }
+        }
+
         var out = outputHandle || await chooseOutput();
         if (!out) return;
         if (!confirm('Copy ' + todo.length + ' file(s) into "' + out.name + '"?\n\nThe source directory is not modified.')) return;

classifier/js/persist.js

@@ -1,88 +1,116 @@
 /**
- * ZDDC Classifier — persistence for the Classify & Copy map.
+ * ZDDC Classifier — workspace persistence (IndexedDB).
  *
- * The assignment map and target trees, plus the picked source directory
+ * A "workspace" is one classification project: the picked source directory
- * HANDLE, are stored in IndexedDB (localStorage can't hold a
+ * HANDLE, a SNAPSHOT of its completed scan (folder/file structure — names and
- * FileSystemDirectoryHandle; the handle is structured-cloneable, so IndexedDB
+ * paths only, no contents), and the Classify & Copy map (assignments + target
- * can). On reload we re-request permission on the stored handle — a single
+ * trees). Scan once, resume instantly across sessions without re-walking the
- * click re-grants access, no re-navigation. If that fails (permission denied,
+ * (often cloud-backed, high-latency) source.
- * or a different machine), the caller falls back to a fresh pick and the map
- * re-attaches by relative path.
  *
- * NOTE: a stored handle is only valid in the same browser profile on the same
+ * Two object stores so the welcome list stays cheap:
- * machine. The map keys on source-relative paths, so re-picking the same tree
+ *   - 'index' (tiny):  { id, name, rootName, createdAt, updatedAt, summary }
- * elsewhere still re-attaches — that's the warning shown to the user on save.
+ *   - 'data'  (large): { id, rootHandle, tree, classify }
+ *
+ * A FileSystemDirectoryHandle is structured-cloneable, so IndexedDB can hold
+ * it; on reuse we re-request permission (one click). It's only needed at COPY
+ * time — opening a workspace runs entirely from the snapshot.
  */
 (function () {
     'use strict';
 
     var DB_NAME = 'zddc-classifier';
-    var STORE = 'kv';
+    var DB_VERSION = 2;
-    var K_STATE = 'classify-state';
+    var IDX = 'index';
-    var K_HANDLE = 'source-handle';
+    var DATA = 'data';
 
     var available = typeof indexedDB !== 'undefined';
 
     function openDB() {
         return new Promise(function (resolve, reject) {
             if (!available) { reject(new Error('IndexedDB unavailable')); return; }
-            var req = indexedDB.open(DB_NAME, 1);
+            var req = indexedDB.open(DB_NAME, DB_VERSION);
             req.onupgradeneeded = function () {
                 var db = req.result;
-                if (!db.objectStoreNames.contains(STORE)) db.createObjectStore(STORE);
+                // 'kv' (v1, single implicit map) is intentionally left behind.
+                if (!db.objectStoreNames.contains(IDX)) db.createObjectStore(IDX, { keyPath: 'id' });
+                if (!db.objectStoreNames.contains(DATA)) db.createObjectStore(DATA, { keyPath: 'id' });
             };
             req.onsuccess = function () { resolve(req.result); };
             req.onerror = function () { reject(req.error); };
         });
     }
 
-    function tx(mode, fn) {
+    function reqP(req) {
-        return openDB().then(function (db) {
+        return new Promise(function (resolve, reject) {
-            return new Promise(function (resolve, reject) {
+            req.onsuccess = function () { resolve(req.result); };
-                var t = db.transaction(STORE, mode);
+            req.onerror = function () { reject(req.error); };
-                var store = t.objectStore(STORE);
-                var out = fn(store);
-                t.oncomplete = function () { resolve(out && out.result !== undefined ? out.result : out); };
-                t.onerror = function () { reject(t.error); };
-                t.onabort = function () { reject(t.error); };
-            });
-        });
-    }
-
-    function put(key, value) { return tx('readwrite', function (s) { return s.put(value, key); }); }
-
-    function getValue(key) {
-        return openDB().then(function (db) {
-            return new Promise(function (resolve, reject) {
-                var t = db.transaction(STORE, 'readonly');
-                var req = t.objectStore(STORE).get(key);
-                req.onsuccess = function () { resolve(req.result); };
-                req.onerror = function () { reject(req.error); };
-            });
         });
     }
 
     // ── public API ─────────────────────────────────────────────────────────
-    function saveState(obj) { return put(K_STATE, obj).catch(function (e) { console.warn('persist.saveState', e); }); }
-    function loadState() { return getValue(K_STATE).catch(function () { return null; }); }
 
-    function saveSourceHandle(handle) {
+    // Light metadata for every workspace (for the welcome list). Sorted newest
-        // Real FileSystemDirectoryHandle only; the HTTP polyfill handle is not
+    // first. Never loads the big snapshot.
-        // worth persisting (server mode re-detects the root on load).
+    function listWorkspaces() {
-        if (!handle || handle.isHttp) return Promise.resolve();
+        return openDB().then(function (db) {
-        return put(K_HANDLE, handle).catch(function (e) { console.warn('persist.saveHandle', e); });
+            return reqP(db.transaction(IDX, 'readonly').objectStore(IDX).getAll());
-    }
+        }).then(function (rows) {
-    function loadSourceHandle() { return getValue(K_HANDLE).catch(function () { return null; }); }
+            (rows || []).sort(function (a, b) { return (b.updatedAt || 0) - (a.updatedAt || 0); });
-
+            return rows || [];
-    function clearAll() {
+        }).catch(function (e) { console.warn('persist.list', e); return []; });
-        return tx('readwrite', function (s) { s.delete(K_STATE); s.delete(K_HANDLE); })
-            .catch(function (e) { console.warn('persist.clear', e); });
     }
 
-    // Re-acquire read permission on a stored handle. Returns true if usable.
+    // Full data record for one workspace: { id, rootHandle, tree, classify }.
-    function verifyPermission(handle) {
+    function getWorkspace(id) {
+        return openDB().then(function (db) {
+            return reqP(db.transaction(DATA, 'readonly').objectStore(DATA).get(id));
+        }).catch(function (e) { console.warn('persist.get', e); return null; });
+    }
+
+    // Save (create or update). meta = {id,name,rootName,createdAt,updatedAt,summary};
+    // data = {id, rootHandle, tree, classify}. tree may be omitted on a classify-
+    // only autosave (the snapshot rarely changes) — then we preserve the stored one.
+    function putWorkspace(meta, data) {
+        return openDB().then(function (db) {
+            return new Promise(function (resolve, reject) {
+                var t = db.transaction([IDX, DATA], 'readwrite');
+                t.oncomplete = function () { resolve(); };
+                t.onerror = function () { reject(t.error); };
+                t.objectStore(IDX).put(meta);
+                var ds = t.objectStore(DATA);
+                if (data && typeof data.tree !== 'undefined') {
+                    ds.put(data);
+                } else if (data) {
+                    // Merge classify/rootHandle without clobbering the snapshot.
+                    var g = ds.get(meta.id);
+                    g.onsuccess = function () {
+                        var existing = g.result || { id: meta.id };
+                        if (typeof data.rootHandle !== 'undefined') existing.rootHandle = data.rootHandle;
+                        if (typeof data.classify !== 'undefined') existing.classify = data.classify;
+                        existing.id = meta.id;
+                        ds.put(existing);
+                    };
+                }
+            });
+        }).catch(function (e) { console.warn('persist.put', e); });
+    }
+
+    function deleteWorkspace(id) {
+        return openDB().then(function (db) {
+            return new Promise(function (resolve, reject) {
+                var t = db.transaction([IDX, DATA], 'readwrite');
+                t.oncomplete = function () { resolve(); };
+                t.onerror = function () { reject(t.error); };
+                t.objectStore(IDX).delete(id);
+                t.objectStore(DATA).delete(id);
+            });
+        }).catch(function (e) { console.warn('persist.delete', e); });
+    }
+
+    // Re-acquire read permission on a stored handle (one click). true if usable.
+    function verifyPermission(handle, write) {
         if (!handle || typeof handle.queryPermission !== 'function') return Promise.resolve(false);
-        var opts = { mode: 'read' };
+        var opts = { mode: write ? 'readwrite' : 'read' };
         return handle.queryPermission(opts).then(function (p) {
             if (p === 'granted') return true;
             return handle.requestPermission(opts).then(function (p2) { return p2 === 'granted'; });
@@ -91,8 +119,10 @@
 
     window.app.modules.persist = {
         available: available,
-        saveState: saveState, loadState: loadState,
+        listWorkspaces: listWorkspaces,
-        saveSourceHandle: saveSourceHandle, loadSourceHandle: loadSourceHandle,
+        getWorkspace: getWorkspace,
-        verifyPermission: verifyPermission, clearAll: clearAll,
+        putWorkspace: putWorkspace,
+        deleteWorkspace: deleteWorkspace,
+        verifyPermission: verifyPermission,
     };
 })();

classifier/js/scanner.js

@@ -751,12 +751,95 @@
         };
     }
 
+    // ── Workspace snapshot (scan once, resume without re-walking the FS) ────
+
+    // Serialize the completed scan to compact JSON (short keys: large trees).
+    // Zip-root nodes are NOT preserved as expandable folders — the .zip stays a
+    // plain file in its parent (classifying inside archives is out of scope for
+    // a persisted workspace).
+    function snapshotTree() {
+        function serFile(f) { return { o: f.originalFilename, e: f.extension, p: f.folderPath }; }
+        function serNode(n) {
+            var o = { n: n.name, p: n.path };
+            if (n.files && n.files.length) o.f = n.files.map(serFile);
+            var realKids = (n.children || []).filter(function (c) { return !c.isZipRoot; });
+            if (realKids.length) o.c = realKids.map(serNode);
+            return o;
+        }
+        return (window.app.folderTree || []).map(serNode);
+    }
+
+    // Rebuild window.app.folderTree from a snapshot — handle-less nodes, marked
+    // 'done', subtree totals recomputed. Handles are resolved lazily from the
+    // workspace root handle at copy/preview time.
+    function loadSnapshot(snap) {
+        function deFile(sf) {
+            return {
+                handle: null, folderHandle: null,
+                originalFilename: sf.o, extension: sf.e,
+                size: null, lastModified: null,
+                trackingNumber: '', revision: '', status: '', title: '',
+                isDirty: false, error: false, errorMessage: '', validation: null, sha256: null,
+                folderPath: sf.p,
+            };
+        }
+        function deNode(sn, parent) {
+            var node = makeNode({ name: sn.n, kind: 'directory' }, sn.p, parent);
+            node.handle = null;
+            node.scanState = 'done';
+            node.expanded = false;
+            node.files = (sn.f || []).map(deFile);
+            node.children = (sn.c || []).map(function (c) { return deNode(c, node); });
+            node.fileCount = node.files.length;
+            node.subdirCount = node.children.length;
+            return node;
+        }
+        var roots = (snap || []).map(function (sn) { return deNode(sn, null); });
+        if (roots[0]) roots[0].expanded = true;
+        (function totals(nodes) {
+            nodes.forEach(function (n) {
+                totals(n.children);
+                var rf = n.files.length, rd = n.children.length;
+                n.children.forEach(function (c) { rf += c.runFiles; rd += c.runDirs; });
+                n.runFiles = rf; n.runDirs = rd;
+            });
+        })(roots);
+        window.app.folderTree = roots;
+        if (window.app.modules.store && window.app.modules.store.setFolderTree) {
+            window.app.modules.store.setFolderTree(roots);
+        }
+        return roots;
+    }
+
+    // ── Lazy handle resolution (snapshot files carry paths, not handles) ────
+    function relFromRoot(p) { var i = (p || '').indexOf('/'); return i < 0 ? '' : p.slice(i + 1); }
+    async function resolveDirHandle(rootHandle, relPath) {
+        var cur = rootHandle;
+        var parts = (relPath || '').split('/').filter(Boolean);
+        for (var i = 0; i < parts.length; i++) { cur = await cur.getDirectoryHandle(parts[i]); }
+        return cur;
+    }
+    // Resolve (and cache) a file object's handle from the workspace root.
+    async function resolveFileHandle(rootHandle, fileObj) {
+        if (fileObj.handle) return fileObj.handle;
+        var dir = await resolveDirHandle(rootHandle, relFromRoot(fileObj.folderPath));
+        var name = zddc.joinExtension(fileObj.originalFilename, fileObj.extension);
+        var h = await dir.getFileHandle(name);
+        fileObj.handle = h;
+        fileObj.folderHandle = dir;
+        return h;
+    }
+
     // Export module
     window.app.modules.scanner = {
         scanDirectory,
         ensureScanned,
         getZipCache,
-        extractZip
+        extractZip,
+        snapshotTree,
+        loadSnapshot,
+        resolveFileHandle,
+        resolveDirHandle
     };
 })();
 

classifier/js/workspace.js

@@ -0,0 +1,230 @@
+/**
+ * ZDDC Classifier — workspace manager (Classify & Copy).
+ *
+ * A workspace = one classification project: a source directory handle, a
+ * snapshot of its completed scan, and the Classify & Copy map. The welcome
+ * screen lists them; opening one resumes instantly from the snapshot (no
+ * re-scan), and the map autosaves as you work. Only Copy needs the live
+ * filesystem (a one-click permission re-grant).
+ */
+(function () {
+    'use strict';
+
+    var els = {};
+    var initialized = false;
+    var activeId = null;
+    var activeMeta = null;      // {id,name,rootName,createdAt,updatedAt,summary}
+
+    function P() { return window.app.modules.persist; }
+    function C() { return window.app.modules.classify; }
+    function now() { return Date.now(); }
+    function uid() {
+        if (window.crypto && typeof window.crypto.randomUUID === 'function') {
+            try { return window.crypto.randomUUID(); } catch (_) { /* non-secure ctx */ }
+        }
+        return 'w' + now().toString(36) + Math.floor(Math.random() * 1e9).toString(36);
+    }
+
+    function init() {
+        if (initialized) return;
+        initialized = true;
+        els = {
+            welcome: document.getElementById('welcomeScreen'),
+            list: document.getElementById('workspaceList'),
+            newBtn: document.getElementById('newWorkspaceBtn'),
+            wsBtn: document.getElementById('workspacesBtn'),
+        };
+        if (!P() || !P().available) {
+            // No IndexedDB → hide the workspace UI; legacy rename path still works.
+            var wrap = document.getElementById('workspacesSection');
+            if (wrap) wrap.style.display = 'none';
+            return;
+        }
+        if (els.newBtn) els.newBtn.addEventListener('click', newWorkspace);
+        if (els.wsBtn) els.wsBtn.addEventListener('click', showWelcome);
+        if (els.list) els.list.addEventListener('click', onListClick);
+
+        // Autosave the active workspace whenever the map changes.
+        C().on(scheduleAutosave);
+
+        renderList();
+    }
+
+    // ── welcome list ────────────────────────────────────────────────────────
+    function showWelcome() {
+        if (els.welcome) els.welcome.classList.remove('hidden');
+        renderList();
+    }
+    function hideWelcome() {
+        if (els.welcome) els.welcome.classList.add('hidden');
+    }
+
+    function relTime(ts) {
+        if (!ts) return '';
+        var s = Math.max(0, Math.round((now() - ts) / 1000));
+        if (s < 60) return 'just now';
+        var m = Math.round(s / 60); if (m < 60) return m + 'm ago';
+        var h = Math.round(m / 60); if (h < 24) return h + 'h ago';
+        var d = Math.round(h / 24); return d + 'd ago';
+    }
+
+    function renderList() {
+        if (!els.list) return;
+        P().listWorkspaces().then(function (rows) {
+            els.list.textContent = '';
+            if (!rows.length) {
+                var empty = document.createElement('div');
+                empty.className = 'ws-empty';
+                empty.textContent = 'No workspaces yet. “+ New workspace” scans a folder once and saves it here.';
+                els.list.appendChild(empty);
+                return;
+            }
+            rows.forEach(function (r) { els.list.appendChild(rowEl(r)); });
+        });
+    }
+    function rowEl(r) {
+        var s = r.summary || { files: 0, done: 0, excluded: 0 };
+        var row = document.createElement('div');
+        row.className = 'ws-row';
+        row.dataset.id = r.id;
+
+        var main = document.createElement('div');
+        main.className = 'ws-row__main';
+        var nm = document.createElement('div'); nm.className = 'ws-row__name'; nm.textContent = r.name;
+        var meta = document.createElement('div'); meta.className = 'ws-row__meta';
+        meta.textContent = (r.rootName || '') + ' · ' + s.done + '/' + s.files + ' classified'
+            + (s.excluded ? (' · ' + s.excluded + ' excluded') : '') + ' · updated ' + relTime(r.updatedAt);
+        main.appendChild(nm); main.appendChild(meta);
+
+        var actions = document.createElement('div');
+        actions.className = 'ws-row__actions';
+        [['open', 'Open'], ['rename', 'Rename'], ['delete', 'Delete']].forEach(function (a) {
+            var b = document.createElement('button');
+            b.className = 'btn btn-sm ' + (a[0] === 'open' ? 'btn-primary' : 'btn-secondary');
+            b.dataset.act = a[0]; b.textContent = a[1];
+            actions.appendChild(b);
+        });
+        row.appendChild(main); row.appendChild(actions);
+        return row;
+    }
+    function onListClick(e) {
+        var btn = e.target.closest('[data-act]');
+        if (!btn) return;
+        var row = btn.closest('.ws-row');
+        var id = row && row.dataset.id;
+        if (!id) return;
+        if (btn.dataset.act === 'open') openWorkspace(id);
+        else if (btn.dataset.act === 'rename') renameWorkspace(id);
+        else if (btn.dataset.act === 'delete') deleteWorkspace(id);
+    }
+
+    // ── summary ───────────────────────────────────────────────────────────
+    function allFiles() {
+        var out = [];
+        (function walk(ns) { (ns || []).forEach(function (n) { (n.files || []).forEach(function (f) { out.push(f); }); walk(n.children); }); })(window.app.folderTree || []);
+        return out;
+    }
+    function summary() {
+        var s = C().stats(allFiles());
+        return { files: s.total, done: s.done, excluded: s.excluded };
+    }
+
+    // ── create / open / rename / delete ─────────────────────────────────────
+    async function newWorkspace() {
+        if (!window.showDirectoryPicker) {
+            window.zddc.toast('Workspaces need the File System Access API (use Chromium).', 'error');
+            return;
+        }
+        var dir;
+        try { dir = await window.showDirectoryPicker(); }
+        catch (e) { if (e.name !== 'AbortError') window.zddc.toast('Could not open folder — ' + (e.message || e), 'error'); return; }
+
+        window.app.rootHandle = dir;
+        window.app.modules.app.enterAppShell();
+        // The one slow pass: a full scan (then never again for this workspace).
+        await window.app.modules.scanner.scanDirectory(dir);
+
+        var name = prompt('Name this workspace:', dir.name);
+        if (name === null) name = dir.name;
+        name = name.trim() || dir.name;
+
+        activeId = uid();
+        activeMeta = { id: activeId, name: name, rootName: dir.name, createdAt: now(), updatedAt: now(), summary: summary() };
+        await P().putWorkspace(activeMeta, {
+            id: activeId, rootHandle: dir,
+            tree: window.app.modules.scanner.snapshotTree(),
+            classify: C().serialize(),
+        });
+        window.app.modules.app.setMode('classify');
+    }
+
+    async function openWorkspace(id) {
+        var rec = await P().getWorkspace(id);
+        var rows = await P().listWorkspaces();
+        var meta = rows.filter(function (r) { return r.id === id; })[0];
+        if (!rec || !meta) { window.zddc.toast('Could not load that workspace.', 'error'); return; }
+
+        activeId = id;
+        activeMeta = meta;
+        window.app.rootHandle = rec.rootHandle || null;
+        window.app.modules.app.enterAppShell();
+        window.app.modules.scanner.loadSnapshot(rec.tree || []);
+        C().load(rec.classify || {});
+        window.app.modules.app.setMode('classify');
+        hideWelcome();
+    }
+
+    function renameWorkspace(id) {
+        P().listWorkspaces().then(function (rows) {
+            var meta = rows.filter(function (r) { return r.id === id; })[0];
+            if (!meta) return;
+            var name = prompt('Rename workspace:', meta.name);
+            if (!name || !name.trim()) return;
+            meta.name = name.trim(); meta.updatedAt = now();
+            if (activeMeta && activeMeta.id === id) activeMeta.name = meta.name;
+            P().putWorkspace(meta, null).then(renderList);
+        });
+    }
+    function deleteWorkspace(id) {
+        if (!confirm('Delete this workspace? The map and snapshot are removed — your source files are untouched.')) return;
+        if (activeId === id) { activeId = null; activeMeta = null; }
+        P().deleteWorkspace(id).then(renderList);
+    }
+
+    // ── autosave (debounced) ────────────────────────────────────────────────
+    var saveTimer = null;
+    function scheduleAutosave() {
+        if (!activeId || !activeMeta) return;
+        if (saveTimer) clearTimeout(saveTimer);
+        saveTimer = setTimeout(function () {
+            saveTimer = null;
+            activeMeta.updatedAt = now();
+            activeMeta.summary = summary();
+            // classify-only put: tree omitted → the stored snapshot is preserved.
+            P().putWorkspace(activeMeta, { id: activeId, classify: C().serialize() });
+        }, 500);
+    }
+
+    // Called after a "Refresh from disk" rescan — re-persist the snapshot for
+    // the active workspace (the path-keyed map carries over automatically).
+    function onRescanned() {
+        if (!activeId || !activeMeta) return;
+        activeMeta.updatedAt = now();
+        activeMeta.summary = summary();
+        P().putWorkspace(activeMeta, {
+            id: activeId,
+            tree: window.app.modules.scanner.snapshotTree(),
+            classify: C().serialize(),
+        });
+    }
+
+    window.app.modules.workspace = {
+        init: init,
+        showWelcome: showWelcome,
+        newWorkspace: newWorkspace,
+        openWorkspace: openWorkspace,
+        onRescanned: onRescanned,
+        renderList: renderList,
+        activeId: function () { return activeId; },
+    };
+})();

classifier/template.html

@@ -34,6 +34,7 @@
                         <button id="modeRenameBtn" class="mode-btn active" title="Rename files in place (edits the source)">Rename</button>
                         <button id="modeClassifyBtn" class="mode-btn" title="Map files onto target trees and copy renamed copies to an output directory — source is never modified">Classify &amp; Copy</button>
                     </div>
+                    <button id="workspacesBtn" class="btn btn-secondary btn-sm" title="Workspaces — open or create a classification project">≡ Workspaces</button>
                 </div>
                 <div class="header-right">
             <button id="theme-btn" class="btn btn-secondary" title="Theme: auto (follows OS)" aria-label="Theme: auto (follows OS)">◐</button>
@@ -178,8 +179,17 @@
                         workflow alongside file navigation. This standalone build remains
                         available for offline use and air-gapped environments.
                     </p>
-                    <p>Rename a folder of files to ZDDC format using a spreadsheet interface.</p>
+                    <!-- Workspaces (Classify & Copy) -->
-                    <p>Open a directory, fill in tracking number, revision, status, and title for each file, then save — the files are renamed on disk.</p>
+                    <section id="workspacesSection" class="workspaces">
+                        <div class="ws-head">
+                            <h3>Workspaces</h3>
+                            <button id="newWorkspaceBtn" class="btn btn-primary btn-sm">+ New workspace</button>
+                        </div>
+                        <p class="ws-intro">Scan a folder <em>once</em>, then map files onto tracking numbers and transmittals and copy renamed copies to an output directory — the source is never modified. Workspaces save in this browser so you can resume across sessions.</p>
+                        <div id="workspaceList" class="ws-list"><!-- rendered --></div>
+                    </section>
+
+                    <p class="ws-or">— or — rename a folder of files <strong>in place</strong>: click <strong>Use Local Directory</strong> above (quick, no workspace).</p>
 
                     <!-- Browser Compatibility Warning -->
                     <div id="browserWarning" class="browser-warning hidden">

tests/classify.spec.js

@@ -357,6 +357,116 @@ test('copy: two sources mapping to the same output path are a conflict', async (
     expect(conflicts).toBe(1);
 });
 
+// ── Workspaces: snapshot, persistence, copy-from-snapshot ──────────────────
+
+test('snapshot: serialize + rebuild preserves structure, marks done, drops handles', async ({ page }) => {
+    const r = await page.evaluate(() => {
+        const sc = window.app.modules.scanner;
+        window.app.folderTree = [{
+            name: 'Root', path: 'Root', expanded: true, scanState: 'done',
+            files: [{ originalFilename: 'a', extension: 'pdf', folderPath: 'Root' }],
+            children: [{
+                name: 'sub', path: 'Root/sub', scanState: 'done',
+                files: [{ originalFilename: 'b', extension: 'txt', folderPath: 'Root/sub' }], children: [],
+            }],
+        }];
+        const json = JSON.stringify(sc.snapshotTree());
+        window.app.folderTree = [];
+        sc.loadSnapshot(JSON.parse(json));
+        const root = window.app.folderTree[0];
+        return {
+            rootName: root.name, done: root.scanState === 'done', runFiles: root.runFiles,
+            subFile: root.children[0].files[0].originalFilename,
+            subPath: root.children[0].files[0].folderPath,
+            handleNull: root.children[0].files[0].handle === null,
+        };
+    });
+    expect(r.rootName).toBe('Root');
+    expect(r.done).toBe(true);
+    expect(r.runFiles).toBe(2);
+    expect(r.subFile).toBe('b');
+    expect(r.subPath).toBe('Root/sub');
+    expect(r.handleNull).toBe(true);
+});
+
+test('persist: workspace put / list / get / delete round-trip', async ({ page }) => {
+    const r = await page.evaluate(async () => {
+        const P = window.app.modules.persist;
+        const id = 'test-ws-1';
+        await P.putWorkspace(
+            { id, name: 'WS', rootName: 'Root', createdAt: 1, updatedAt: 2, summary: { files: 3, done: 1, excluded: 0 } },
+            { id, rootHandle: null, tree: [{ n: 'Root', p: 'Root' }], classify: { assignments: {}, trackingTree: [], transmittalTree: [] } });
+        const meta = (await P.listWorkspaces()).filter((w) => w.id === id)[0];
+        const data = await P.getWorkspace(id);
+        await P.deleteWorkspace(id);
+        const goneAfter = (await P.listWorkspaces()).filter((w) => w.id === id).length;
+        return { name: meta && meta.name, files: meta && meta.summary.files, treeLen: data && data.tree.length, goneAfter };
+    });
+    expect(r.name).toBe('WS');
+    expect(r.files).toBe(3);
+    expect(r.treeLen).toBe(1);
+    expect(r.goneAfter).toBe(0);
+});
+
+test('persist: classify-only autosave preserves the stored snapshot', async ({ page }) => {
+    const r = await page.evaluate(async () => {
+        const P = window.app.modules.persist;
+        const id = 'test-ws-2';
+        await P.putWorkspace({ id, name: 'A', rootName: 'R', createdAt: 1, updatedAt: 1, summary: { files: 1, done: 0, excluded: 0 } },
+            { id, rootHandle: null, tree: [{ n: 'R', p: 'R' }], classify: {} });
+        await P.putWorkspace({ id, name: 'A', rootName: 'R', createdAt: 1, updatedAt: 2, summary: { files: 1, done: 1, excluded: 0 } },
+            { id, classify: { assignments: { x: {} } } });   // no tree → must preserve
+        const data = await P.getWorkspace(id);
+        await P.deleteWorkspace(id);
+        return { treePreserved: !!(data && data.tree && data.tree.length === 1), hasClassify: !!(data && data.classify.assignments) };
+    });
+    expect(r.treePreserved).toBe(true);
+    expect(r.hasClassify).toBe(true);
+});
+
+test('copy: snapshot files (no handle) resolve from the workspace root', async ({ page }) => {
+    await page.click('#modeClassifyBtn');
+    const res = await page.evaluate(async () => {
+        const c = window.app.modules.classify, copy = window.app.modules.copy;
+        const srcStore = { 'Sub/foundation.pdf': 'AAA' };
+        const mkSrcDir = (prefix) => ({
+            name: prefix || 'Root',
+            getDirectoryHandle: async (n) => mkSrcDir((prefix ? prefix + '/' : '') + n),
+            getFileHandle: async (n) => {
+                const full = (prefix ? prefix + '/' : '') + n;
+                if (!(full in srcStore)) { const e = new Error('NF'); e.name = 'NotFoundError'; throw e; }
+                return { getFile: async () => new File([srcStore[full]], n) };
+            },
+            queryPermission: async () => 'granted', requestPermission: async () => 'granted',
+        });
+        window.app.rootHandle = mkSrcDir('');
+        const f = { originalFilename: 'foundation', extension: 'pdf', folderPath: 'Root/Sub', handle: null };
+        window.app.folderTree = [{ name: 'Root', path: 'Root', files: [], children: [{ name: 'Sub', path: 'Root/Sub', files: [f], children: [] }] }];
+        const leaf = c.addTrackingNode(c.addTrackingNode(null, 'ACME-MECH-0001'), 'A (IFR)');
+        const bin = c.addTransmittalBin(c.addParty('ClientCorp'), 'received', { date: '2026-03-14', type: 'TRN', seq: '0007' });
+        c.place([c.srcKeyForFile(f)], leaf, 'tracking'); c.place([c.srcKeyForFile(f)], bin, 'transmittal');
+
+        const outStore = {};
+        const mkOut = (prefix) => ({
+            name: prefix || 'out',
+            getDirectoryHandle: async (n) => mkOut((prefix ? prefix + '/' : '') + n),
+            getFileHandle: async (n, opts) => {
+                const full = (prefix ? prefix + '/' : '') + n;
+                if (!opts || !opts.create) { if (!(full in outStore)) { const e = new Error('NF'); e.name = 'NotFoundError'; throw e; } }
+                return {
+                    getFile: async () => new File([outStore[full] != null ? outStore[full] : ''], n),
+                    createWritable: async () => ({ write: async (d) => { outStore[full] = (d && d.text) ? await d.text() : d; }, close: async () => { } }),
+                };
+            },
+        });
+        const s = await copy.copyTo(mkOut(''), copy.plan());
+        return { copied: s.copied, content: Object.values(outStore)[0], wrote: Object.keys(outStore).some((k) => k.endsWith('foundation.pdf')) };
+    });
+    expect(res.copied).toBe(1);
+    expect(res.wrote).toBe(true);
+    expect(res.content).toBe('AAA');
+});
+
 test('deleting a tracking node clears the files placed in it', async ({ page }) => {
     const after = await page.evaluate((file) => {
         const c = window.app.modules.classify;