Python: Improve DevUI, add Context Inspector view as new tab under traces (#2742)

* Improve DevUI, add Context Inspector view as new tab under traces

* fix mypy errors

* fix: Handle stale MCP connections in DevUI executor

MCP tools can become stale when HTTP streaming responses end - the underlying
stdio streams close but `is_connected` remains True. This causes subsequent
requests to fail with `ClosedResourceError`.

Add `_ensure_mcp_connections()` to detect and reconnect stale MCP tools before
agent execution. This is a workaround for an upstream Agent Framework issue
where connection state isn't properly tracked.

Fixes MCP tools failing on second HTTP request in DevUI.

fixes  #1476 #1515 #2865

* fix #1572 report import dependency errors more clearly

* Ensure there is streaming toggle where users can select streaming vs non streaming mode in devui . Fixes .NET: [Python] DevUI tool call rendering in non-streaming mode?

* remove unused dead code

* improve ux - workflows with agents show a chat component in execution timelien, also ensure magentic final output shows correctly

* update ui build

* update devui to use instrumentation instead of tracing, other instrumentation and type/instance check fixes

python/packages/devui/frontend/src/components/layout/deployment-modal.tsx

@@ -209,7 +209,7 @@ export function DeploymentModal({
         setCopiedTemplate(null);
         timeoutRef.current = null;
       }, 2000);
-    } catch (err) {
+    } catch {
       // Reset state on error - clipboard write failed
       setCopiedTemplate(null);
     }
@@ -248,7 +248,7 @@ services:
       - AZURE_OPENAI_API_KEY=\${AZURE_OPENAI_API_KEY}
       - AZURE_OPENAI_ENDPOINT=\${AZURE_OPENAI_ENDPOINT}
       - AZURE_OPENAI_CHAT_DEPLOYMENT_NAME=\${AZURE_OPENAI_CHAT_DEPLOYMENT_NAME}
-      # Optional: Enable tracing
+      # Optional: Enable instrumentation
       - ENABLE_INSTRUMENTATION=\${ENABLE_INSTRUMENTATION:-false}
     ports:
       - "8080:8080"