Add Weave-integrated feedback buttons to agent response messages

[thepatrickchin]

Description

This PR provides the frontend implementation corresponding to the Weave feedback changes in NVIDIA/NeMo-Agent-Toolkit#781. See also NVIDIA/NeMo-Agent-Toolkit#759 for additional context.

The feedback buttons trigger an API call that is available in NAT when Weave tracing is enabled. The endpoint expects a call ID that corresponds to the Weave trace for the specific agent message. The following summarizes how the call ID is extracted for different endpoints:

Weave Call ID Extraction by Endpoint Type

Non-Streaming Endpoints (/chat, /generate)

• Backend → Proxy: Backend returns Weave-Call-Id in HTTP response header
• Proxy → Frontend: Proxy gateway forwards the header unchanged
• Frontend: Extracts from headers: response.headers.get('Weave-Call-Id')
• Storage: Attached to the assistant message object in conversation history

Streaming Endpoints (/chat/stream, /generate/stream)

• Backend → Proxy: Backend includes weave_call_id field in SSE data chunks (JSON payload)
• Proxy → Frontend: Proxy extracts parsed.weave_call_id and wraps it in <weavecallid>ID</weavecallid> tags, injected into the stream
• Frontend: Parses tags during stream processing with regex: /<weavecallid>([\s\S]*?)<\/weavecallid>/g and stores ID in extractedWeaveCallId variable
• Storage: Attached to the assistant message object in conversation history

WebSocket Mode

• Backend → Frontend: Backend includes weave_call_id field directly in WebSocket message payload
• Frontend: Extracts weave_call_id from WebSocket message payload
• Storage: Attached to the assistant message object in conversation history

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• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

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