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pull request. -->

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## Why are these changes needed?

Fix termination UI in AGS, ensure it can be edited correctly

<img width="1269" alt="image"
src="https://github.com/user-attachments/assets/eaa7a92f-a1ea-4ab4-a679-2894ac441311"
/>
<img width="1273" alt="image"
src="https://github.com/user-attachments/assets/6db81068-932f-4d4e-9512-279770c02bf2"
/>
<img width="1270" alt="image"
src="https://github.com/user-attachments/assets/5ca9df7d-b968-46c9-9d62-becd78809273"
/>


<!-- Please give a short summary of the change and the problem this
solves. -->

## Related issue number

<!-- For example: "Closes #1234" -->
Closes #5872
## Checks

- [ ] I've included any doc changes needed for
<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.

<!-- Thank you for your contribution! Please review
https://microsoft.github.io/autogen/docs/Contribute before opening a
pull request. -->

This PR has 3 main improvements. 

- Token streaming 
- Adds support for environment variables in the app settings 
- Updates AGS to persist Gallery entry in db.

## Adds Token Streaming in AGS.  

Agentchat now supports streaming of tokens via
`ModelClientStreamingChunkEvent `. This PR is to track progress on
supporting that in the AutoGen Studio UI.

If `model_client_stream` is enabled in an assitant agent, then token
will be streamed in UI.

```python
streaming_assistant = AssistantAgent(
    name="assistant",
    model_client=model_client,
    system_message="You are a helpful assistant.",
    model_client_stream=True,  # Enable streaming tokens.
)

```

https://github.com/user-attachments/assets/74d43d78-6359-40c3-a78e-c84dcb5e02a1


## Env Variables 
Also adds support for env variables in AGS Settings

You can set env variables that are loaded just before a team is run.
Handy to set variable to be used by tools etc.

<img width="1291" alt="image"
src="https://github.com/user-attachments/assets/437b9d90-ccee-42f7-be5d-94ab191afd67"
/>


> Note: the set variables are available to the server process.

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## Why are these changes needed?

<!-- Please give a short summary of the change and the problem this
solves. -->

## Related issue number

<!-- For example: "Closes #1234" -->
Closes #5627  
Closes #5662 
Closes #5619 

## Checks

- [ ] I've included any doc changes needed for
<https://microsoft.github.io/autogen/>. See
<https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md> to
build and test documentation locally.
- [ ] I've added tests (if relevant) corresponding to the changes
introduced in this PR.
- [ ] I've made sure all auto checks have passed.

* update deps to address dependabot issues.

* fill screen width, closes #5050

* documentation improvements

* update version, fix component factory bug

* add basic structure for deploy

* minor fixes, deploy v1

* minor text updated

* format fixes

* formatting fixes .. webby test samples

* update cli command, update views,

* packakge.json and other fixes

* format fixes

* v1 progress on drag_drop

* add v1 for node deletions

* major refactor, add sidebar to teams and session playground

* format updates

* formatting updates

* update formatting

* formatting and other checks

* add mangentic one deps

* general refactor, fix new team creation bug etc...

* minor bugfix

* update uv lock

---------

Co-authored-by: Ryan Sweet <rysweet@microsoft.com>

* fix import issue related to agentchat update #4245

* update uv lock file

* fix db auto_upgrade logic issue.

* im prove msg rendering issue

* Support termination condition combination. Closes #4325

* fix db instantiation bug

* update yarn.lock, closes #4260 #4262

* remove deps for now with vulnerabilities found by dependabot #4262

* update db tests

* add ability to load sessions from db ..

* format updates, add format checks to ags

* format check fixes

* linting and ruff check fixes

* make tests for ags non-parrallel to avoid db race conditions.

* format updates

* fix concurrency issue

* minor ui tweaks, move run start to websocket

* lint fixes

* update uv.lock

* Update python/packages/autogen-studio/autogenstudio/datamodel/types.py

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

* Update python/packages/autogen-studio/autogenstudio/teammanager.py

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>

* reuse user proxy from agentchat

* ui tweaks

---------

Co-authored-by: Eric Zhu <ekzhu@users.noreply.github.com>
Co-authored-by: Hussein Mozannar <hmozannar@microsoft.com>

* add react-flow

* update tutorial, some ui improvement for agent thread layout

* v1 for interactive viz for agent state

* add Ui visualization of message based transitions

* minor updates

* fix node edges, support visualization of self loops

* improve edges and layout, add support for selector group chat prompt

* minor ui tweaks

* ui and layout updates

* ugrade dependencies to fix dependabot scan errors

* persist sidebar, enable contentbar title mechanism #4191

* add support for user proxy agent, support human in put mode. #4011

* add UI support for human input mode via a userproxy agent  #4011

* version update

* fix db initialization bug

* support for human input mode in UI, fix backend api route minor bugs

* update pyproject toml and uv lock

* readme update, support full screen mode for agent visualiation

* update uv.lock

* add react-flow

* update tutorial, some ui improvement for agent thread layout

* v1 for interactive viz for agent state

* add Ui visualization of message based transitions

* minor updates

* fix node edges, support visualization of self loops

* improve edges and layout, add support for selector group chat prompt

* minor ui tweaks

* add skeleton worflow manager

* add test notebook

* update test nb

* add sample team spec

* refactor requirements to agentchat and ext

* add base provider to return agentchat agents from json spec

* initial api refactor, update dbmanager

* api refactor

* refactor tests

* ags api tutorial update

* ui refactor

* general refactor

* minor refactor updates

* backend api refaactor

* ui refactor and update

* implement v1 for streaming connection with ui updates

* backend refactor

* ui refactor

* minor ui tweak

* minor refactor and tweaks

* general refactor

* update tests

* sync uv.lock with main

* uv lock update