rebrand: AI Assist -> Vibe Architect, sidebar highlight (v1.9.0)

CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.9.0] - 2026-03-18 21:05 UTC
+
+### Changed
+- **Global Rebrand: AI Assist -> Vibe Architect** — All instances renamed across UI, sidebar, translations (EN/RU/HE)
+- **Sidebar Highlight** — Vibe Architect button now has a gradient blue-purple border and bold blue text when not active, making it stand out in the navigation menu
+
+### Technical Details
+- Files modified: 3 (Sidebar.tsx, AIAssist.tsx, translations.ts)
+
 ## [1.8.0] - 2026-03-18 21:02 UTC
 
 ### Added