Python: Add Function Approval UI to DevUI

[Victor Dibia (victordibia)]

Motivation and Context

Add a helpful UI for function approval flow in DevUI and other fixes

Performance & Architecture:

• Implement lazy loading for entity discovery - entities loaded on-demand instead of at startup
• Add hot reload capability for development workflow via new reload endpoint
• Reduce startup time and memory footprint by deferring module imports

Security Enhancements:

• Remove remote entity loading capabilities (POST /v1/entities/add, DELETE endpoints)
• DevUI now strictly local development tool - no remote code execution
• Add explicit security documentation and best practices in README

Frontend Improvements:

• Migrate to Zustand for centralized state management (replacing prop drilling)
• Add lightweight zero-dependency markdown renderer with code block copy support
• Improve gallery UX with setup instructions modal instead of direct URL loading
• Enhanced message UI with copy functionality and better token usage display

Testing & Quality:

• Expand test coverage for lazy loading, type detection, and cache invalidation
• Add comprehensive tests for new behaviors (+231 lines of test code)
• Improve type safety and documentation throughout

Breaking Changes:

• Remote entity loading via URLs is no longer supported
• Entities must be loaded from local filesystem only

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

[Mark Wallace (markwallace-microsoft)]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
TOTAL	10361	1706	83%

report-only-changed-files is enabled. No files were changed during this commit :)

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
1276	98 💤	0 ❌	0 🔥	27.954s ⏱️

[Copilot]

Pull Request Overview

This PR adds a comprehensive Function Approval UI to DevUI and implements numerous architectural improvements for better performance, security, and developer experience.

Key changes include:

• Implement lazy loading for entity discovery to reduce startup time and memory usage
• Add hot reload capability for development workflow
• Remove remote entity loading capabilities for enhanced security
• Migrate frontend to Zustand for centralized state management
• Add lightweight markdown renderer with code block copy support

Reviewed Changes

Copilot reviewed 35 out of 38 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
python/packages/devui/tests/test_execution.py	Updates test assertions to support "unknown" entity type during discovery phase
python/packages/devui/tests/test_discovery.py	Adds comprehensive tests for lazy loading, type detection, and hot reload functionality
python/packages/devui/frontend/vite.config.ts	Removes commented build optimization settings
python/packages/devui/frontend/src/types/openai.ts	Reorganizes event type definitions and adds turn separator for UI grouping
python/packages/devui/frontend/src/stores/devuiStore.ts	Implements centralized Zustand store for unified state management
python/packages/devui/frontend/src/components/ui/markdown-renderer.tsx	Adds zero-dependency markdown renderer with code block copy functionality
python/packages/devui/frontend/src/components/layout/settings-modal.tsx	Reorders tabs to prioritize Settings over About
python/packages/devui/frontend/src/components/layout/entity-selector.tsx	Updates to show lazy loading indicators and removes remote entity management
python/packages/devui/frontend/src/components/layout/deployment-modal.tsx	Adds comprehensive deployment guide with Docker and Azure instructions
python/packages/devui/frontend/src/components/features/agent/agent-view.tsx	Migrates to Zustand store and adds message copy functionality

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