release: bump version to v3.7.1 and update CHANGELOG

Author: ThisIs-Developer

CHANGELOG.md

@@ -3,6 +3,18 @@
 All notable code changes to **Markdown Viewer** are documented here.
 Non-code commits (documentation, planning, README-only updates) are excluded.
 
+## v3.7.1
+
+- **Description:** Scoped performance optimizations, accessibility remediation, onboarding template stabilization, and library upgrades.
+  - **Performance & Reflows:** Scoped in-memory caching to editor geometry and gutter layouts to eliminate forced synchronous reflows; debounced resize layout listeners and deferred non-critical startup initializations to accelerate page load and cut Total Blocking Time (TBT).
+  - **Accessibility (a11y):** Resolved multiple Lighthouse accessibility violations; fixed line-number contrast ratios for both light and dark themes; increased touch target sizes conforming to WCAG AA guidelines.
+  - **Onboarding & Templating:** Stabilized the onboarding template initialization (resolving `BUG-ONBOARD-001`); inlined the default welcome markdown; and migrated it to a `<script type="text/markdown">` container to seamlessly preserve raw HTML tags in default content without parser interference.
+  - **Library Upgrades:** Upgraded the embedded Mermaid.js diagrams rendering library to the latest version, enhancing visual layouts and rendering stability.
+- **Date:** 2026-06-01
+- **URL:** https://github.com/ThisIs-Developer/Markdown-Viewer/commit/e9fef8adfa8201661ee4af18c22f941496e5308b
+
+---
+
 ## v3.7.0
 
 - **Description:** Complete architectural performance engineering transformation and application modernization.

desktop-app/resources/js/script.js

@@ -27,7 +27,7 @@ document.addEventListener("DOMContentLoaded", function () {
 
   // CDN URLs for lazy-loaded libraries
   const CDN = {
-    mermaid: 'https://cdn.jsdelivr.net/npm/mermaid@11.6.0/dist/mermaid.min.js',
+    mermaid: 'https://cdn.jsdelivr.net/npm/mermaid@11.15.0/dist/mermaid.min.js',
     mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.js',
     jspdf: 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js',
     html2canvas: 'https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js',
@@ -48,7 +48,7 @@ document.addEventListener("DOMContentLoaded", function () {
 
   // View Mode State - Story 1.1
   let currentViewMode = 'split'; // 'editor', 'split', or 'preview'
-  const APP_VERSION = '3.7.0';
+  const APP_VERSION = '3.7.1';
   let activeModal = null;
   let lastFocusedElement = null;
   let isFindModalOpen = false;

script.js

@@ -48,7 +48,7 @@ document.addEventListener("DOMContentLoaded", function () {
 
   // View Mode State - Story 1.1
   let currentViewMode = 'split'; // 'editor', 'split', or 'preview'
-  const APP_VERSION = '3.7.0';
+  const APP_VERSION = '3.7.1';
   let activeModal = null;
   let lastFocusedElement = null;
   let isFindModalOpen = false;

sw.js

@@ -1,4 +1,4 @@
-const CACHE_NAME = 'markdown-viewer-cache-v3.7.0';
+const CACHE_NAME = 'markdown-viewer-cache-v3.7.1';
 
 // PERF-011: Split precache into critical (local files) and lazy (CDN libraries)
 // Critical assets are precached during SW install for instant offline startup