feat: Enhance tool display in Tools sidebar by simplifying tool identifiers (#2024)

# What does this PR do?
This PR improves the Tools page in the LlamaStack Playground UI by
enhancing the readability of the active tool list shown in the sidebar.
- Previously, active tools were displayed in a flat JSON array with
verbose identifiers (e.g., builtin::code_interpreter:code_interpreter).
- This PR updates the logic to group tools by their toolgroup (e.g.,
builtin::websearch) and renders each tool name in a simplified,
human-readable format (e.g., web_search).
- This change improves usability when working with multiple toolgroups,
especially in configurations involving MCP tools or complex tool
identifiers.

Before and After Comparison:
**Before**
![Screenshot 2025-04-24 at 1 05
47 PM](https://github.com/user-attachments/assets/44843a79-49dc-4b4d-ab28-c6187f9bb5ba)

**After**
![Screenshot 2025-04-24 at 1 24
08 PM](https://github.com/user-attachments/assets/ebb01006-e0a9-4664-a95a-e6f72eea6f94)

[//]: # (If resolving an issue, uncomment and update the line below)
[//]: # (Closes #[issue-number])

## Test Plan
- Followed the [LlamaStack UI Developer Setup
instructions](https://github.com/meta-llama/llama-stack/tree/main/llama_stack/distribution/ui)
- Ran the Streamlit UI via: `uv run --with "[.ui]" streamlit run
llama_stack/distribution/ui/app.py`
- Selected multiple built-in toolgroups (e.g., code_interpreter,
websearch, wolfram_alpha) from the sidebar.

[//]: # (## Documentation)

llama_stack/distribution/ui/page/playground/tools.py

@@ -66,17 +66,20 @@ def tool_chat_page():
 
         toolgroup_selection.extend(mcp_selection)
 
-        active_tool_list = []
-        for toolgroup_id in toolgroup_selection:
-            active_tool_list.extend(
-                [
-                    f"{''.join(toolgroup_id.split('::')[1:])}:{t.identifier}"
-                    for t in client.tools.list(toolgroup_id=toolgroup_id)
-                ]
-            )
+        grouped_tools = {}
+        total_tools = 0
 
-        st.markdown(f"Active Tools: 🛠 {len(active_tool_list)}", help="List of currently active tools.")
-        st.json(active_tool_list)
+        for toolgroup_id in toolgroup_selection:
+            tools = client.tools.list(toolgroup_id=toolgroup_id)
+            grouped_tools[toolgroup_id] = [tool.identifier for tool in tools]
+            total_tools += len(tools)
+
+        st.markdown(f"Active Tools: 🛠 {total_tools}")
+
+        for group_id, tools in grouped_tools.items():
+            with st.expander(f"🔧 Tools from `{group_id}`"):
+                for idx, tool in enumerate(tools, start=1):
+                    st.markdown(f"{idx}. `{tool.split(':')[-1]}`")
 
         st.subheader("Agent Configurations")
         max_tokens = st.slider(