Fix: UserFillUp interactive forms not working in agent explore mode (#14589)

## Summary

- **Backend**: `_iter_session_completion_events` in `agent_api.py` was
filtering out `user_inputs` and `workflow_finished` SSE events, causing
agents with UserFillUp components to silently fail in explore mode — the
interactive form never appeared, while the same agent worked correctly
in run (editor) mode.
- **Frontend**: `SessionChat` component in explore mode was missing
`DebugContent` children rendering inside `MessageItem`, so even if the
backend forwarded the events, the form UI would not render. Added
`DebugContent`, `MarkdownContent`, `useAwaitCompentData` hook, and
input-disabling logic to match the run mode's `chat/box.tsx` behavior.

## What was changed

### Backend (`api/apps/restful_apis/agent_api.py`)
- Line 266: Added `"user_inputs"` and `"workflow_finished"` to the
allowed event filter in `_iter_session_completion_events`

### Frontend (`web/src/pages/agent/explore/components/session-chat.tsx`)
- Added imports: `DebugContent`, `MarkdownContent`,
`useAwaitCompentData`, `useParams`
- Added `sendFormMessage` from `useSendSessionMessage()` hook
- Added `useAwaitCompentData` hook for form state management
- Added `DebugContent` as `MessageItem` children for the latest
assistant message (renders UserFillUp form)
- Added `MarkdownContent` + submitted values display for previous
assistant messages
- Updated `NextMessageInput` disabled states to respect `isWaitting`
(form submission in progress)

## Test plan

- [x] Agent with UserFillUp component (e.g., email draft with
send/edit/cancel options) shows interactive form in **explore mode**
- [x] Same agent continues to work correctly in **run (editor) mode**
- [x] Form submission sends data back to the agent and workflow
continues
- [x] Input field is disabled while waiting for form submission
- [ ] Agents without UserFillUp components are unaffected in explore
mode

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Zhichang Yu <yuzhichang@gmail.com>

api/apps/restful_apis/agent_api.py

@@ -575,7 +575,14 @@ async def _iter_session_completion_events(tenant_id, agent_id, req, return_trace
             yield ans
             continue
 
-        if event in ["message", "message_end"]:
+        if event in ["message", "message_end", "user_inputs", "workflow_finished"]:
+            if event in ["user_inputs", "workflow_finished"]:
+                logging.debug(
+                    "Forwarding session completion event: tenant_id=%s agent_id=%s event=%s",
+                    tenant_id,
+                    agent_id,
+                    event,
+                )
             yield ans
 
 
@@ -1564,7 +1571,10 @@ async def agent_chat_completion(tenant_id, agent_id=None):
                             "trace": [copy.deepcopy(data)],
                         }
                     )
-            final_ans = ans
+            if ans.get("event") == "message_end":
+                final_ans = ans
+            elif ans.get("event") == "user_inputs" and not final_ans:
+                final_ans = ans
         except Exception as exc:
             return get_result(data=f"**ERROR**: {str(exc)}")
 

api/apps/restful_apis/bot_api.py

@@ -24,6 +24,7 @@ from quart import Response, request
 
 from agent.canvas import Canvas
 from api.apps import AUTH_BETA, login_required
+from api.db.db_models import APIToken
 from api.db.services.api_service import API4ConversationService
 from api.db.services.canvas_service import UserCanvasService
 from api.db.services.canvas_service import completion as agent_completion
@@ -53,6 +54,13 @@ from api.utils.reference_metadata_utils import (
 logger = logging.getLogger(__name__)
 
 
+def _get_sdk_authorization_token():
+    auth_header = request.headers.get("Authorization", "")
+    if not auth_header.startswith("Bearer "):
+        return ""
+    return auth_header[len("Bearer "):].strip()
+
+
 @manager.route("/chatbots/<dialog_id>/completions", methods=["POST"])  # noqa: F821
 @login_required(auth_types=AUTH_BETA)
 @add_tenant_id_to_kwargs

api/apps/restful_apis/document_api.py

@@ -29,8 +29,8 @@ from api.constants import FILE_NAME_LEN_LIMIT, IMG_BASE64_PREFIX
 from api.apps.services.document_api_service import validate_document_update_fields, map_doc_keys, \
     map_doc_keys_with_run_status, update_document_name_only, update_chunk_method, update_document_status_only, \
     reset_document_for_reparse
-from api.db import VALID_FILE_TYPES, FileType, DB
-from api.db.db_models import API4Conversation
+from api.db import VALID_FILE_TYPES, FileType
+from api.db.db_models import API4Conversation, DB
 from api.db.services import duplicate_name
 from api.db.services.doc_metadata_service import DocMetadataService
 from api.db.db_models import Task