added QR code generation to docs

Author: gamosoft

documentation/FEATURES.md

@@ -13,7 +13,7 @@
 - **LaTeX/Math rendering** - Beautiful mathematical equations with MathJax (see [MATHJAX.md](MATHJAX.md))
 - **Mermaid diagrams** - Create flowcharts, sequence diagrams, and more (see [MERMAID.md](MERMAID.md))
 - **HTML Export** - Export notes as standalone HTML files with embedded images
-- **Public Sharing** - Share notes via token-based URLs without requiring authentication (see [SHARING.md](SHARING.md))
+- **Public Sharing** - Share notes via token-based URLs with optional QR code for mobile (see [SHARING.md](SHARING.md))
 
 ### Media Support
 - **Drag & drop upload** - Drop files from your file system directly into the editor

documentation/SHARING.md

@@ -7,7 +7,7 @@ Share notes publicly without requiring viewers to log in.
 1. Open a note you want to share
 2. Click the **Share** button in the toolbar
 3. Click **Create Share Link**
-4. Copy the generated URL and send it to anyone
+4. Copy the generated URL or click **Show QR Code** for easy mobile scanning
 
 The recipient can view the note in their browser - no account needed.
 
@@ -27,6 +27,7 @@ The old URL will immediately stop working.
 - **Code highlighting** - Syntax highlighting works in shared notes
 - **Copy button** - Code blocks have a copy-to-clipboard button
 - **MathJax & Mermaid** - Math equations and diagrams render correctly
+- **QR code** - Generate a QR code for easy mobile sharing
 - **No expiration** - Links work until you revoke them
 
 ## Visual Indicators