feat: v1.4.0 — review code, web search grounding, responsive preview

New features:
- Review Code button sends generated code back to AI for review
- Web search grounding via SearXNG (toggle in toolbar, enriches prompts)
- Responsive preview with device size selector (Full/Desktop/Tablet/Mobile)
- /api/search proxy route

Fixes:
- Model selector text color now white on dark theme
- Post-coding button text overflow (shorter labels + min-w-0)
- Duplicate activateArtifact button suppressed when action row shows

README.md

@@ -47,6 +47,11 @@ Transform vague ideas into production-ready prompts and PRDs. PromptArch is an A
 - Live code rendering with `[PREVIEW]` tags
 - HTML, React, Python, and more — rendered in-browser
 - Auto-detect renderable vs. code-only previews
+- Responsive preview with device size selector (Full / Desktop / Tablet / Mobile)
+
+### Code Review & Web Search
+- **Review Code** — Send generated code back to AI for bug/security/performance review
+- **Web Search Grounding** — Toggle to enrich prompts with live web search results via SearXNG
 
 ### Enhanced Prompt Engine
 - 9 strategies: clarify, add-context, add-constraints, structure, add-examples, set-tone, expand, simplify, chain-of-thought
@@ -136,6 +141,7 @@ This project follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 | Version | Date | Highlights |
 |---------|------|------------|
+| [1.4.0](CHANGELOG.md#140---2026-03-18) | 2026-03-18 19:57 | Review Code button, web search grounding, responsive preview, model selector fix |
 | [1.3.0](CHANGELOG.md#130---2026-03-18) | 2026-03-18 18:51 | Plan-first workflow, OpenRouter, post-coding UX, enhanced prompt engine |
 | [1.2.0](CHANGELOG.md#120---2026-01-19) | 2026-01-19 19:16 | SEO agent fixes, Z.AI API validation |
 | [1.1.0](CHANGELOG.md#110---2025-12-29) | 2025-12-29 17:55 | GitHub push, XLSX/HTML export, OAuth management |