diff --git a/maritime-ai-service/app/engine/multi_agent/direct_document_preview_payloads.py b/maritime-ai-service/app/engine/multi_agent/direct_document_preview_payloads.py
index ee5ae2dc..7d193a2d 100644
--- a/maritime-ai-service/app/engine/multi_agent/direct_document_preview_payloads.py
+++ b/maritime-ai-service/app/engine/multi_agent/direct_document_preview_payloads.py
@@ -9,6 +9,7 @@
     DOC_PREVIEW_HOST_ACTION_TOOL as _DOC_PREVIEW_HOST_ACTION_TOOL,
     find_document_host_action_tool,
     looks_uploaded_document_course_request as _looks_uploaded_doc_course_request,
+    looks_uploaded_document_lesson_preview_request as _looks_uploaded_doc_lesson_preview_request,
     normalize_document_contract_text as _normalize_doc_preview_text,
     uploaded_document_attachments_from_state as _uploaded_document_attachments_from_state,
 )
@@ -144,25 +145,7 @@ def _should_request_uploaded_doc_preview(
         return False
     if not _uploaded_document_attachments_from_state(state):
         return False
-    normalized = _normalize_doc_preview_text(query)
-    return any(
-        marker in normalized
-        for marker in (
-            "preview",
-            "xem truoc",
-            "ban xem truoc",
-            "ban nhap",
-            "draft",
-            "cap nhat bai hoc",
-            "tao ban xem truoc",
-            "lesson patch",
-            "preview_lesson_patch",
-            "source_references",
-            "citation",
-            "trich dan",
-            "nguon",
-        )
-    )
+    return _looks_uploaded_doc_lesson_preview_request(query)
 
 
 def _resolve_doc_preview_lesson_id(state: AgentState | None) -> str:
diff --git a/maritime-ai-service/app/engine/multi_agent/direct_node_uploaded_context.py b/maritime-ai-service/app/engine/multi_agent/direct_node_uploaded_context.py
index 916e7440..274f792d 100644
--- a/maritime-ai-service/app/engine/multi_agent/direct_node_uploaded_context.py
+++ b/maritime-ai-service/app/engine/multi_agent/direct_node_uploaded_context.py
@@ -8,6 +8,8 @@
 
 from app.engine.multi_agent.document_preview_contract import (
     has_uploaded_document_context as _has_uploaded_document_context,
+    looks_uploaded_document_course_request as _looks_uploaded_document_course_request,
+    looks_uploaded_document_lesson_preview_request as _looks_uploaded_document_lesson_preview_request,
     uploaded_document_attachments_from_context as _uploaded_document_attachments,
 )
 from app.engine.multi_agent.direct_session_memory_runtime import (
@@ -121,48 +123,11 @@ def _looks_uploaded_document_preview_request(query: str) -> bool:
     folded = _fold_direct_text(query)
     if not folded:
         return False
-    preview_markers = (
-        "approval_token",
-        "ban nhap",
-        "ban xem truoc",
-        "citation",
-        "diff",
-        "lesson patch",
-        "preview",
-        "preview_lesson_patch",
-        "source references",
-        "source_references",
-        "lap bai giang",
-        "soan bai giang",
-        "soan giao an",
-        "tao bai giang",
-        "tao giao an",
-        "tao hoc lieu",
-        "tao ban xem truoc",
-        "tao khoa hoc",
-        "thiet ke bai giang",
-        "thiet ke khoa hoc",
-        "xay dung bai giang",
-        "cau truc khoa hoc",
-        "toan bo khoa",
-        "cay khoa",
-        "chia khoa",
-        "course architect",
-        "course outline",
-        "course syllabus",
-        "curriculum",
-        "de cuong khoa",
-        "de cuong mon",
-        "giao trinh",
-        "ke hoach giang day",
-        "learning path",
-        "lo trinh hoc",
-        "syllabus",
-        "generate_course_from_document",
-        "trich dan",
-        "xem truoc",
+    return _looks_uploaded_document_course_request(
+        folded
+    ) or _looks_uploaded_document_lesson_preview_request(
+        folded
     )
-    return any(marker in folded for marker in preview_markers)
 
 
 def _looks_uploaded_context_fact_query(query: str, ctx: dict[str, Any]) -> bool:
diff --git a/maritime-ai-service/app/engine/multi_agent/document_preview_contract.py b/maritime-ai-service/app/engine/multi_agent/document_preview_contract.py
index bba406fb..3acfd3b7 100644
--- a/maritime-ai-service/app/engine/multi_agent/document_preview_contract.py
+++ b/maritime-ai-service/app/engine/multi_agent/document_preview_contract.py
@@ -66,6 +66,45 @@
     "outline",
 )
 
+_LESSON_AUTHORING_EXCLUSION_MARKERS = (
+    "bai tap",
+    "bai kiem tra",
+    "cau hoi",
+    "kiem tra",
+    "quiz",
+)
+
+_LESSON_AUTHORING_VERBS = (
+    "build",
+    "create",
+    "lam",
+    "lap",
+    "soan",
+    "tao",
+    "thiet ke",
+    "viet",
+    "write",
+    "xay dung",
+)
+
+_LESSON_PREVIEW_REQUEST_MARKERS = (
+    "approval_token",
+    "ban nhap",
+    "ban xem truoc",
+    "cap nhat bai hoc",
+    "citation",
+    "diff",
+    "draft",
+    "lesson patch",
+    "preview",
+    "preview_lesson_patch",
+    "source references",
+    "source_references",
+    "tao ban xem truoc",
+    "trich dan",
+    "xem truoc",
+)
+
 
 def normalize_document_contract_text(value: Any) -> str:
     text = str(value or "").replace("\\_", "_")
@@ -127,6 +166,23 @@ def looks_uploaded_document_course_request(query: str) -> bool:
     return any(marker in normalized for marker in _COURSE_REQUEST_MARKERS)
 
 
+def _looks_singular_lesson_authoring_request(normalized: str) -> bool:
+    if not ("bai hoc" in normalized or "lesson" in normalized):
+        return False
+    if any(marker in normalized for marker in _LESSON_AUTHORING_EXCLUSION_MARKERS):
+        return False
+    return any(marker in normalized for marker in _LESSON_AUTHORING_VERBS)
+
+
+def looks_uploaded_document_lesson_preview_request(query: str) -> bool:
+    normalized = normalize_document_contract_text(query)
+    if not normalized:
+        return False
+    return any(marker in normalized for marker in _LESSON_PREVIEW_REQUEST_MARKERS) or (
+        _looks_singular_lesson_authoring_request(normalized)
+    )
+
+
 def _runtime_tool_name(
     tool: Any,
     *,
diff --git a/maritime-ai-service/app/engine/multi_agent/tool_collection.py b/maritime-ai-service/app/engine/multi_agent/tool_collection.py
index 80a810fa..e7fbba75 100644
--- a/maritime-ai-service/app/engine/multi_agent/tool_collection.py
+++ b/maritime-ai-service/app/engine/multi_agent/tool_collection.py
@@ -11,7 +11,12 @@
 from typing import Any, Optional
 
 from app.core.config import settings
+from app.engine.multi_agent.document_preview_contract import (
+    looks_uploaded_document_course_request as _contract_looks_uploaded_document_course_request,
+    looks_uploaded_document_lesson_preview_request as _contract_looks_uploaded_document_lesson_preview_request,
+)
 from app.engine.multi_agent.state import AgentState
+
 logger = logging.getLogger(__name__)
 
 
@@ -24,6 +29,14 @@ def _normalize_for_intent(query: str) -> str:
     return _load_attr("app.engine.multi_agent.direct_intent", "_normalize_for_intent")(query)
 
 
+def _looks_uploaded_document_course_request(query: str) -> bool:
+    return _contract_looks_uploaded_document_course_request(query)
+
+
+def _looks_uploaded_document_lesson_preview_request(query: str) -> bool:
+    return _contract_looks_uploaded_document_lesson_preview_request(query)
+
+
 def _needs_web_search(query: str) -> bool:
     return _load_attr("app.engine.multi_agent.direct_intent", "_needs_web_search")(query)
 
@@ -277,113 +290,17 @@ def _has_uploaded_document_context_state(state: Optional[AgentState]) -> bool:
 def _looks_like_document_preview_request(query: str, state: Optional[AgentState]) -> bool:
     if not _has_uploaded_document_context_state(state):
         return False
-    normalized = _normalize_for_intent(query)
-    return any(
-        marker in normalized
-        for marker in (
-            "preview",
-            "xem truoc",
-            "ban xem truoc",
-            "ban nhap",
-            "draft",
-            "cap nhat bai hoc",
-            "lap bai giang",
-            "soan bai giang",
-            "soan giao an",
-            "tao bai giang",
-            "tao giao an",
-            "tao hoc lieu",
-            "tao bai hoc",
-            "tao khoa hoc",
-            "thiet ke bai giang",
-            "thiet ke khoa hoc",
-            "xay dung bai giang",
-            "cau truc khoa hoc",
-            "toan bo khoa",
-            "cay khoa",
-            "chia khoa",
-            "course architect",
-            "course outline",
-            "course syllabus",
-            "curriculum",
-            "de cuong khoa",
-            "de cuong mon",
-            "giao trinh",
-            "ke hoach giang day",
-            "learning path",
-            "lo trinh hoc",
-            "syllabus",
-            "generate_course_from_document",
-            "lesson patch",
-            "preview_lesson_patch",
-            "source_references",
-            "citation",
-            "trich dan",
-            "nguon",
-        )
+    return _looks_uploaded_document_course_request(
+        query
+    ) or _looks_uploaded_document_lesson_preview_request(
+        query
     )
 
 
 def _looks_like_document_course_preview_request(query: str, state: Optional[AgentState]) -> bool:
     if not _has_uploaded_document_context_state(state):
         return False
-    normalized = _normalize_for_intent(query)
-    if any(
-        marker in normalized
-        for marker in (
-            "preview_lesson_patch",
-            "lesson patch",
-            "bai hoc hien tai",
-            "cap nhat bai hoc",
-        )
-    ):
-        return False
-    return any(
-        marker in normalized
-        for marker in (
-            "generate_course_from_document",
-            "lap bai giang",
-            "soan bai giang",
-            "soan giao an",
-            "tao bai giang",
-            "tao giao an",
-            "tao hoc lieu",
-            "course architect",
-            "course outline",
-            "course syllabus",
-            "curriculum",
-            "full course",
-            "toan bo khoa",
-            "cay khoa",
-            "chia khoa",
-            "chia thanh bai",
-            "chia thanh chuong",
-            "chuong trinh dao tao",
-            "de cuong khoa",
-            "de cuong mon",
-            "giao trinh",
-            "ke hoach giang day",
-            "khoa dao tao",
-            "khoa day du",
-            "khoa hoan chinh",
-            "learning path",
-            "lo trinh hoc",
-            "lo trinh khoa",
-            "nhieu bai hoc",
-            "nhieu chuong",
-            "phan chia bai hoc",
-            "syllabus",
-            "tao khoa hoc",
-            "thiet ke bai giang",
-            "thiet ke khoa hoc",
-            "xay dung bai giang",
-            "cau truc khoa hoc",
-            "chuong/bai",
-            "chuong bai",
-            "module",
-            "outline",
-        )
-    )
+    return _looks_uploaded_document_course_request(query)
 
 
 def _document_preview_host_action_tools(tools: list[Any]) -> list[Any]:
diff --git a/maritime-ai-service/tests/unit/test_document_context_api.py b/maritime-ai-service/tests/unit/test_document_context_api.py
index 60fdf29a..8ef47f49 100644
--- a/maritime-ai-service/tests/unit/test_document_context_api.py
+++ b/maritime-ai-service/tests/unit/test_document_context_api.py
@@ -507,6 +507,33 @@ def test_uploaded_document_preview_request_bypasses_fact_fast_path():
     assert not _looks_uploaded_context_fact_query(query, ctx)
 
 
+def test_uploaded_document_lesson_creation_request_bypasses_fact_fast_path():
+    from app.engine.multi_agent.direct_node_uploaded_context import (
+        _looks_uploaded_context_fact_query,
+        _looks_uploaded_document_preview_request,
+    )
+
+    ctx = {
+        "document_context": {
+            "attachments": [
+                {
+                    "file_name": "lesson.docx",
+                    "media_kind": "document",
+                    "parser": "markitdown",
+                    "markdown": (
+                        "Ke hoach bai hoc thu nghiem Wiii\n"
+                        "Chu de: An toan hang hai va approval_token.\n"
+                    ),
+                }
+            ]
+        }
+    }
+    query = "tao cho minh bai hoc"
+
+    assert _looks_uploaded_document_preview_request(query)
+    assert not _looks_uploaded_context_fact_query(query, ctx)
+
+
 def test_uploaded_document_visual_guard_does_not_describe_frames_without_vision():
     from app.engine.multi_agent.direct_node_uploaded_context import (
         _build_uploaded_document_visual_guard_answer,
diff --git a/maritime-ai-service/tests/unit/test_document_preview_contract.py b/maritime-ai-service/tests/unit/test_document_preview_contract.py
index e3785f77..b46498bd 100644
--- a/maritime-ai-service/tests/unit/test_document_preview_contract.py
+++ b/maritime-ai-service/tests/unit/test_document_preview_contract.py
@@ -8,6 +8,7 @@
     has_document_preview_host_action_tool,
     has_uploaded_document_context,
     looks_uploaded_document_course_request,
+    looks_uploaded_document_lesson_preview_request,
     uploaded_document_attachments_from_context,
     uploaded_document_attachments_from_state,
 )
@@ -44,6 +45,13 @@ def test_uploaded_document_course_intent_is_shared_by_preview_and_tool_rounds():
     assert not looks_uploaded_document_course_request("cap nhat bai hoc hien tai")
 
 
+def test_uploaded_document_lesson_preview_intent_is_shared_by_preview_and_tool_rounds():
+    assert looks_uploaded_document_lesson_preview_request("tao cho minh bai hoc")
+    assert looks_uploaded_document_lesson_preview_request("cap nhat bai hoc hien tai")
+    assert looks_uploaded_document_lesson_preview_request("create a lesson from this file")
+    assert not looks_uploaded_document_lesson_preview_request("tao cau hoi cho bai hoc")
+
+
 def test_document_preview_forced_tool_choice_prefers_course_when_available():
     tools = [
         SimpleNamespace(name=DOC_PREVIEW_HOST_ACTION_TOOL),
@@ -59,6 +67,10 @@ def test_document_preview_forced_tool_choice_prefers_course_when_available():
         document_preview_forced_tool_choice("cap nhat bai hoc hien tai", tools)
         == DOC_PREVIEW_HOST_ACTION_TOOL
     )
+    assert (
+        document_preview_forced_tool_choice("tao cho minh bai hoc", tools)
+        == DOC_PREVIEW_HOST_ACTION_TOOL
+    )
 
 
 def test_extract_document_preview_capabilities_from_state_and_context():
diff --git a/wiii-desktop/src/EmbedApp.tsx b/wiii-desktop/src/EmbedApp.tsx
index f04a9c27..f5c0a6c5 100644
--- a/wiii-desktop/src/EmbedApp.tsx
+++ b/wiii-desktop/src/EmbedApp.tsx
@@ -17,7 +17,7 @@
  * 5. Render <ChatView /> directly (no shell)
  * 6. sendReadySignal() to parent
  */
-import { useEffect, useState } from "react";
+import { lazy, Suspense, useEffect, useState } from "react";
 import { ChatView } from "@/components/chat/ChatView";
 import { ErrorBoundary } from "@/components/common/ErrorBoundary";
 import { ToastContainer } from "@/components/common/Toast";
@@ -35,6 +35,11 @@ import { sendReadySignal, sendError, setParentOrigin } from "@/lib/embed-bridge"
 import { buildAuthUserFromJwt, toCompatibilitySettingsRole } from "@/lib/auth-user";
 import type { EmbedConfig } from "@/lib/embed-auth";
 
+const PreviewPanel = lazy(async () => {
+  const mod = await import("@/components/layout/PreviewPanel");
+  return { default: mod.PreviewPanel };
+});
+
 export default function EmbedApp() {
   const [embedConfig, setEmbedConfig] = useState<EmbedConfig | null>(null);
   const [initError, setInitError] = useState<string | null>(null);
@@ -312,6 +317,9 @@ export default function EmbedApp() {
     <ErrorBoundary>
       <div className="h-screen w-full overflow-hidden">
         <ChatView />
+        <Suspense fallback={null}>
+          <PreviewPanel />
+        </Suspense>
       </div>
       <ToastContainer />
     </ErrorBoundary>