diff --git a/frontend/dashboard.css b/frontend/dashboard.css
index b245c22..302bbd5 100644
--- a/frontend/dashboard.css
+++ b/frontend/dashboard.css
@@ -94,6 +94,10 @@ textarea { resize: vertical; min-height: 120px; }
 .plan-today-item { display:grid; grid-template-columns:minmax(0,1fr) auto; gap:8px; align-items:center; padding:10px; border:1px solid #1f3a5f; border-radius:12px; background:#0f1d33; }
 .plan-today-item-copy { min-width:0; overflow-wrap:anywhere; }
 .plan-today-item-actions { display:flex; gap:6px; flex-wrap:wrap; justify-content:flex-end; }
+.plan-today-candidate-actions { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:6px; }
+.plan-preview-actions { position:fixed; z-index:76; right:16px; bottom:calc(16px + env(safe-area-inset-bottom)); display:grid; grid-template-columns:1fr 1fr; gap:8px; width:min(420px,calc(100vw - 32px)); padding:10px; border:1px solid #31577f; border-radius:12px; background:rgba(11,21,38,.98); box-shadow:0 12px 36px rgba(0,0,0,.45); }
+.plan-preview-actions[hidden] { display:none; }
+.plan-preview-actions button { min-height:44px; }
 .plan-today-actions { position:sticky; bottom:0; display:grid; grid-template-columns:1fr 1fr; gap:8px; margin:16px -6px -6px; padding:12px 6px; padding-bottom:calc(12px + env(safe-area-inset-bottom)); background:rgba(11,21,38,.98); border-top:1px solid #2a496e; }
 .plan-today-actions button { min-height:44px; width:100%; }
 .my-work-header { display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; }
@@ -365,6 +369,7 @@ textarea { resize: vertical; min-height: 120px; }
   .plan-today-panel { width:100%; border-left:0; padding:14px; }
   .plan-today-item { grid-template-columns:1fr; }
   .plan-today-item-actions { display:grid; grid-template-columns:repeat(3,1fr); width:100%; }
+  .plan-today-candidate-actions { grid-template-columns:repeat(2,1fr); width:100%; }
   .plan-today-item-actions button { min-width:0; padding-inline:4px; }
   .work-filters { width:100%; }
   .work-filter { flex:1 1 calc(50% - 8px); }
diff --git a/frontend/dashboard.js b/frontend/dashboard.js
index 4bf8e31..2d4996d 100644
--- a/frontend/dashboard.js
+++ b/frontend/dashboard.js
@@ -728,7 +728,7 @@
     const title = escapeHtml(item.title || 'Untitled work');
     const controls = selected ?
       '<div class="plan-today-item-actions"><button type="button" data-plan-move="up" data-plan-id="' + escAttr(id) + '"' + (index === 0 ? ' disabled' : '') + '>Up</button><button type="button" data-plan-move="down" data-plan-id="' + escAttr(id) + '"' + (index === planToday.snapshot().count - 1 ? ' disabled' : '') + '>Down</button><button type="button" data-plan-remove="' + escAttr(id) + '">Remove</button></div>' :
-      '<button type="button" data-plan-add="' + escAttr(id) + '">Add</button>';
+      '<div class="plan-today-candidate-actions"><button type="button" data-plan-preview="' + escAttr(id) + '">Preview</button><button type="button" data-plan-add="' + escAttr(id) + '">Add</button></div>';
     return '<article class="plan-today-item"><div class="plan-today-item-copy"><span class="small">' + key + '</span><strong class="my-work-card-title">' + title + '</strong></div>' + controls + '</article>';
   }
 
@@ -747,6 +747,15 @@
       qs('#plan-today-error').textContent = result === 'full' ? 'Today is full. Remove an item before adding another.' : '';
       renderPlanToday();
     }));
+    document.querySelectorAll('[data-plan-preview]').forEach(button => button.addEventListener('click', () => {
+      const item = planToday.item(button.dataset.planPreview);
+      if (!canPreviewPlanItem(item)) {
+        qs('#plan-today-error').textContent = 'Preview unavailable offline. Reconnect or add the item without previewing it.';
+        return;
+      }
+      qs('#plan-today-error').textContent = '';
+      if (planTodayPreview.open(item, button)) taskOverlayHistory.open('plan-today-preview');
+    }));
     document.querySelectorAll('[data-plan-remove]').forEach(button => button.addEventListener('click', () => {
       planToday.toggle(planToday.item(button.dataset.planRemove));
       qs('#plan-today-error').textContent = '';
@@ -792,6 +801,58 @@
     },
   });
 
+  function canPreviewPlanItem(item) {
+    if (!item || !offlineWorkMode) return Boolean(item);
+    const login = planningOwnerLogin || confirmedOwnerLogin ||
+      String(offlineWorkStore.load()?.user?.login || '').trim();
+    return Boolean(offlineWorkStore.loadDetail(login, item));
+  }
+
+  function openPlanPreviewDetail(item, trigger) {
+    qs('#plan-today-sheet').hidden = true;
+    qs('#plan-preview-actions').hidden = false;
+    if (offlineWorkMode) {
+      openRoutedWork(item, trigger);
+    } else if (item.kind === 'update' && item.has_update) {
+      updateTrigger = trigger;
+      notificationReader.open(item, lastMyWork);
+    } else if (item.is_review || item.kind === 'review') {
+      reviewTrigger = trigger;
+      openReviewSheet(item, trigger);
+    } else if (item.kind === 'issue') {
+      issueTrigger = trigger;
+      openIssueSheet(item, trigger);
+    } else if (item.kind === 'pull') {
+      pullTrigger = trigger;
+      openPullSheet(item, trigger);
+    }
+  }
+
+  const planTodayPreview = createPlanTodayPreview({
+    planner: planToday,
+    identity: item => todayWork.identity(item),
+    getScroll: () => qs('.plan-today-panel').scrollTop,
+    setScroll: value => requestAnimationFrame(() => { qs('.plan-today-panel').scrollTop = value; }),
+    onOpen: openPlanPreviewDetail,
+    onClose: (_item, trigger) => {
+      closeOpenWorkSheets();
+      qs('#plan-preview-actions').hidden = true;
+      qs('#plan-today-sheet').hidden = false;
+      renderPlanToday();
+      requestAnimationFrame(() => trigger?.focus());
+    },
+  });
+  let addPlanPreviewOnReturn = false;
+
+  qs('#back-to-plan').addEventListener('click', () => {
+    addPlanPreviewOnReturn = false;
+    taskOverlayHistory.close();
+  });
+  qs('#add-plan-preview').addEventListener('click', () => {
+    addPlanPreviewOnReturn = true;
+    taskOverlayHistory.close();
+  });
+
   function openPlanToday(trigger, navigate = true) {
     if (!planningOwnerLogin) {
       qs('#my-work-action-status').textContent = 'Planning is unavailable until your operator identity is restored.';
@@ -2652,11 +2713,16 @@
         mobileSearchViewport.close();
         qs('#open-palette').focus();
       }
-      if (previous === 'plan-today' && kind !== 'plan-today') closePlanToday(false);
+      if (previous === 'plan-today-preview' && kind !== 'plan-today-preview') {
+        if (addPlanPreviewOnReturn) planTodayPreview.close({ add:true });
+        else planTodayPreview.close();
+        addPlanPreviewOnReturn = false;
+      }
+      if (previous === 'plan-today' && kind !== 'plan-today' && kind !== 'plan-today-preview') closePlanToday(false);
       if (kind === 'new' && previous !== 'new') openCreateIssueSheet(false);
       if (kind === 'find' && previous !== 'find') openFindWorkSheet(false);
       if (kind === 'search' && previous !== 'search-preview') openCommandPalette(false);
-      if (kind === 'plan-today' && previous !== 'plan-today') openPlanToday(planTodayTrigger, false);
+      if (kind === 'plan-today' && previous !== 'plan-today' && previous !== 'plan-today-preview') openPlanToday(planTodayTrigger, false);
     },
   });
   taskOverlayHistory.start();
diff --git a/frontend/index.html b/frontend/index.html
index d6018c3..0d1dee9 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -196,6 +196,11 @@
   </section>
 </div>
 
+<div class="plan-preview-actions" id="plan-preview-actions" hidden>
+  <button id="back-to-plan" type="button">Back to plan</button>
+  <button id="add-plan-preview" type="button">Add to Today &amp; back</button>
+</div>
+
 <div id="cmd-palette" role="dialog" aria-label="Command palette">
   <div class="cmd-palette-header">
     <strong>Search work</strong>
@@ -589,6 +594,7 @@
 <script src="static/card-planning.js"></script>
 <script src="static/today-work.js"></script>
 <script src="static/plan-today.js"></script>
+<script src="static/plan-today-preview.js"></script>
 <script src="static/today-sync.js"></script>
 <script src="static/update-ownership.js"></script>
 <script src="static/later-work.js"></script>
diff --git a/frontend/plan-today-preview.js b/frontend/plan-today-preview.js
new file mode 100644
index 0000000..aa3452d
--- /dev/null
+++ b/frontend/plan-today-preview.js
@@ -0,0 +1,45 @@
+(function (root, factory) {
+  const api = factory();
+  if (typeof module === 'object' && module.exports) module.exports = api;
+  else root.createPlanTodayPreview = api;
+})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
+  'use strict';
+
+  return function createPlanTodayPreview({
+    planner,
+    identity,
+    getScroll = () => 0,
+    setScroll = () => {},
+    onOpen = () => {},
+    onClose = () => {},
+  }) {
+    let current = null;
+
+    function open(item, trigger = null) {
+      if (!item || !identity?.(item) || !planner?.snapshot().open) return false;
+      current = { item, trigger, scroll:Number(getScroll()) || 0 };
+      onOpen(item, trigger);
+      return true;
+    }
+
+    function close({ add = false } = {}) {
+      if (!current) return 'closed';
+      const { item, trigger, scroll } = current;
+      let result = 'returned';
+      if (add) {
+        const id = identity(item);
+        result = planner.snapshot().ids.includes(id) ? 'already-added' : planner.toggle(item);
+      }
+      current = null;
+      setScroll(scroll);
+      onClose(item, trigger);
+      return result;
+    }
+
+    function snapshot() {
+      return current ? { open:true, item:current.item, trigger:current.trigger, scroll:current.scroll } : { open:false };
+    }
+
+    return { open, close, snapshot };
+  };
+});
diff --git a/frontend/service-worker.js b/frontend/service-worker.js
index 4ccf556..6251089 100644
--- a/frontend/service-worker.js
+++ b/frontend/service-worker.js
@@ -1,6 +1,6 @@
 const BASE = new URL('./', self.location.href).pathname;
 importScripts(BASE + 'static/background-issue-sync.js');
-const CACHE = 'stackchain-dashboard-shell-v64';
+const CACHE = 'stackchain-dashboard-shell-v65';
 const OFFLINE_LEASE_URL = new URL(BASE + '__offline-session-lease', self.location.origin).href;
 const OUTAGE_STATUSES = new Set([500, 502, 503, 504]);
 const NAVIGATION_TIMEOUT_MS = self.__STACKCHAIN_NAVIGATION_TIMEOUT_MS || 4000;
@@ -28,6 +28,7 @@ const SHELL = [
   BASE + 'static/card-planning.js',
   BASE + 'static/today-work.js',
   BASE + 'static/plan-today.js',
+  BASE + 'static/plan-today-preview.js',
   BASE + 'static/today-sync.js',
   BASE + 'static/update-ownership.js',
   BASE + 'static/later-work.js',
diff --git a/frontend/task-overlay-history.js b/frontend/task-overlay-history.js
index d1f5c4a..de1d5b2 100644
--- a/frontend/task-overlay-history.js
+++ b/frontend/task-overlay-history.js
@@ -5,7 +5,7 @@
 })(typeof globalThis !== 'undefined' ? globalThis : this, function () {
   'use strict';
 
-  const allowed = new Set(['new', 'find', 'search', 'search-preview', 'plan-today']);
+  const allowed = new Set(['new', 'find', 'search', 'search-preview', 'plan-today', 'plan-today-preview']);
 
   return function createTaskOverlayHistory({ history, eventTarget, onChange }) {
     let active = allowed.has(history.state?.taskOverlay) ? history.state.taskOverlay : null;
diff --git a/tests/test_later_sync.py b/tests/test_later_sync.py
index d64093b..1332eb4 100644
--- a/tests/test_later_sync.py
+++ b/tests/test_later_sync.py
@@ -347,5 +347,5 @@ async def test_dashboard_syncs_every_later_change_and_exposes_account_status():
 def test_later_sync_ships_atomically_in_the_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/later-sync.js'" in source
diff --git a/tests/test_markdown_renderer.py b/tests/test_markdown_renderer.py
index 3bb265f..21cb60a 100644
--- a/tests/test_markdown_renderer.py
+++ b/tests/test_markdown_renderer.py
@@ -137,4 +137,4 @@ def test_markdown_work_bodies_are_mobile_safe_block_containers():
     assert ".markdown-content { min-width:0; max-width:100%; overflow-wrap:anywhere;" in css
     assert ".markdown-content pre { max-width:100%; overflow-x:auto;" in css
     assert ".markdown-content a { min-height:44px;" in css
-    assert "stackchain-dashboard-shell-v64" in worker
+    assert "stackchain-dashboard-shell-v65" in worker
diff --git a/tests/test_mobile_composer_integration.py b/tests/test_mobile_composer_integration.py
index dd05e1e..0454eb2 100644
--- a/tests/test_mobile_composer_integration.py
+++ b/tests/test_mobile_composer_integration.py
@@ -35,4 +35,4 @@ def test_offline_shell_contains_every_local_dashboard_runtime_asset():
     shell_assets = set(re.findall(r"BASE \+ '([^']+)'", worker.split("async function sessionCsrf", 1)[0]))
 
     assert local_assets <= shell_assets, f"Offline shell is missing: {sorted(local_assets - shell_assets)}"
-    assert "stackchain-dashboard-shell-v64" in worker
+    assert "stackchain-dashboard-shell-v65" in worker
diff --git a/tests/test_plan_today.py b/tests/test_plan_today.py
index bab4edd..6102051 100644
--- a/tests/test_plan_today.py
+++ b/tests/test_plan_today.py
@@ -8,6 +8,7 @@ from tests.dashboard_bundle import dashboard
 
 
 PLAN_TODAY = Path(__file__).parents[1] / "frontend" / "plan-today.js"
+PLAN_TODAY_PREVIEW = Path(__file__).parents[1] / "frontend" / "plan-today-preview.js"
 SERVICE_WORKER = Path(__file__).parents[1] / "frontend" / "service-worker.js"
 
 
@@ -78,6 +79,53 @@ process.stdout.write(JSON.stringify({{result, calls, snapshot:planner.snapshot()
     }
 
 
+def test_plan_today_preview_preserves_draft_scroll_and_adds_item_once_on_return():
+    script = f"""
+const createPlanToday = require({json.dumps(str(PLAN_TODAY))});
+const createPlanTodayPreview = require({json.dumps(str(PLAN_TODAY_PREVIEW))});
+const item = number => ({{kind:'issue', repository:'stackchain/dashboard', number, title:'Issue ' + number}});
+const events = [];
+let scroll = 318;
+const planner = createPlanToday({{
+  identity: value => 'issue:stackchain/dashboard:' + value.number + ':',
+  save: () => true,
+}});
+planner.open([item(1)], [item(1), item(2)]);
+const preview = createPlanTodayPreview({{
+  planner,
+  identity: value => 'issue:stackchain/dashboard:' + value.number + ':',
+  getScroll: () => scroll,
+  setScroll: value => {{ scroll = value; }},
+  onOpen: value => events.push(['open', value.number]),
+  onClose: (value, trigger) => events.push(['close', value.number, trigger]),
+}});
+preview.open(item(2), 'preview-2');
+scroll = 0;
+const first = preview.close({{add:true}});
+preview.open(item(2), 'preview-2');
+scroll = 0;
+const second = preview.close({{add:true}});
+process.stdout.write(JSON.stringify({{first, second, scroll, events, planner:planner.snapshot()}}));
+"""
+    assert run_node(script) == {
+        "first": "added",
+        "second": "already-added",
+        "scroll": 318,
+        "events": [
+            ["open", 2],
+            ["close", 2, "preview-2"],
+            ["open", 2],
+            ["close", 2, "preview-2"],
+        ],
+        "planner": {
+            "open": True,
+            "ids": ["issue:stackchain/dashboard:1:", "issue:stackchain/dashboard:2:"],
+            "count": 2,
+            "limit": 5,
+        },
+    }
+
+
 @pytest.mark.anyio
 async def test_mobile_dashboard_wires_focused_plan_today_sheet():
     html = await dashboard()
@@ -96,6 +144,13 @@ async def test_mobile_dashboard_wires_focused_plan_today_sheet():
     assert "padding-bottom:calc(12px + env(safe-area-inset-bottom))" in html
     assert ".plan-today-item { grid-template-columns:1fr; }" in html
     assert ".plan-today-item-actions { display:grid; grid-template-columns:repeat(3,1fr);" in html
+    assert ".plan-preview-actions { position:fixed; z-index:76;" in html
+    assert '<script src="static/plan-today-preview.js"></script>' in html
+    assert 'data-plan-preview="' in html
+    assert 'id="add-plan-preview"' in html
+    assert "taskOverlayHistory.open('plan-today-preview')" in html
+    assert "planTodayPreview.close({ add:true })" in html
+    assert "Preview unavailable offline" in html
 
 
 @pytest.mark.anyio
@@ -113,5 +168,6 @@ async def test_plan_today_wires_cancel_back_and_success_through_overlay_history(
 def test_plan_today_controller_is_available_in_the_offline_shell():
     source = SERVICE_WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/plan-today.js'" in source
+    assert "BASE + 'static/plan-today-preview.js'" in source
diff --git a/tests/test_service_worker.py b/tests/test_service_worker.py
index 90bca3f..4ba2f9f 100644
--- a/tests/test_service_worker.py
+++ b/tests/test_service_worker.py
@@ -121,7 +121,7 @@ async function dispatchNotificationClick(route) {{
 def test_resumable_today_session_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/my-work.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/dashboard.css'" in source
@@ -130,7 +130,7 @@ def test_resumable_today_session_ships_in_a_new_offline_shell():
 def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/create-issue-sheet.js'" in source
     assert "BASE + 'static/dashboard.js'" in source
 
@@ -138,14 +138,14 @@ def test_duplicate_aware_capture_ships_in_a_new_offline_shell():
 def test_exact_later_picker_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/later-picker.js'" in source
 
 
 def test_navigation_deadline_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/dashboard.css'" in source
     assert "BASE + 'static/dashboard.js'" in source
     assert "BASE + 'static/install-app.js'" in source
@@ -154,21 +154,21 @@ def test_navigation_deadline_ships_in_a_new_shell_cache():
 def test_today_convergence_ships_in_a_new_shell_cache():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/today-sync.js'" in source
 
 
 def test_mobile_search_viewport_ships_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/mobile-search-viewport.js'" in source
 
 
 def test_update_ownership_flow_ships_atomically_in_a_new_offline_shell():
     source = WORKER.read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/update-ownership.js'" in source
 
 
@@ -365,6 +365,7 @@ def test_install_precaches_complete_subpath_scoped_app_shell():
         "/dashboard/static/card-planning.js",
         "/dashboard/static/today-work.js",
         "/dashboard/static/plan-today.js",
+        "/dashboard/static/plan-today-preview.js",
         "/dashboard/static/today-sync.js",
         "/dashboard/static/update-ownership.js",
         "/dashboard/static/later-work.js",
diff --git a/tests/test_task_overlay_history.py b/tests/test_task_overlay_history.py
index bdd4552..363cfe5 100644
--- a/tests/test_task_overlay_history.py
+++ b/tests/test_task_overlay_history.py
@@ -162,6 +162,44 @@ process.stdout.write(JSON.stringify({{
     }
 
 
+def test_plan_today_preview_is_a_nested_browser_history_layer():
+    script = f"""
+const createTaskOverlayHistory = require({json.dumps(str(OVERLAY_HISTORY))});
+const listeners = {{}};
+const changes = [];
+const stack = [{{ page:'dashboard' }}];
+let cursor = 0;
+const history = {{
+  get state() {{ return stack[cursor]; }},
+  pushState(state) {{ stack.splice(cursor + 1); stack.push(state); cursor += 1; }},
+  back() {{ cursor -= 1; listeners.popstate({{state:stack[cursor]}}); }},
+}};
+const controller = createTaskOverlayHistory({{
+  history,
+  eventTarget: {{ addEventListener(name, callback) {{ listeners[name] = callback; }} }},
+  onChange(kind, previous) {{ changes.push([kind, previous]); }},
+}});
+controller.start();
+controller.open('plan-today');
+const previewed = controller.open('plan-today-preview');
+controller.close();
+process.stdout.write(JSON.stringify({{previewed, cursor, current:controller.current(), changes}}));
+"""
+    result = subprocess.run(["node", "-e", script], capture_output=True, text=True)
+
+    assert result.returncode == 0, result.stderr
+    assert json.loads(result.stdout) == {
+        "previewed": True,
+        "cursor": 1,
+        "current": "plan-today",
+        "changes": [
+            ["plan-today", None],
+            ["plan-today-preview", "plan-today"],
+            ["plan-today", "plan-today-preview"],
+        ],
+    }
+
+
 def test_dashboard_routes_mobile_task_overlays_through_browser_history():
     html = dashboard_bundle_text()
 
diff --git a/tests/test_today_sync.py b/tests/test_today_sync.py
index 50809f8..abfcbd6 100644
--- a/tests/test_today_sync.py
+++ b/tests/test_today_sync.py
@@ -86,7 +86,7 @@ sync.enqueue('add', 'issue:r:1:');
 def test_inflight_today_drain_ships_in_a_new_offline_shell():
     source = (Path(__file__).parents[1] / "frontend" / "service-worker.js").read_text()
 
-    assert "stackchain-dashboard-shell-v64" in source
+    assert "stackchain-dashboard-shell-v65" in source
     assert "BASE + 'static/today-sync.js'" in source