feat: new textAgent chalk icon + updated tagline

- Replaced M logo with handwritten chalk 'textAgent' icon
- Tagline: 'Write with AI Agents — Markdown Editor & Viewer'
- Updated favicon, og:image, twitter:image references

Author: ijbo

README.md

@@ -1,8 +1,8 @@
 # TextAgent
 
 <div align="center">
-    <img src="assets/icon.jpg" alt="TextAgent Logo" width="150px"/>
-    <h3>AI-Powered Markdown Editor & Viewer</h3>
+    <img src="assets/icon.png" alt="TextAgent Logo" width="150px"/>
+    <h3>Write with AI Agents — Markdown Editor & Viewer</h3>
     <p>Write, preview, present, and share — all in your browser, 100% client-side</p>
     <a href="https://textagent.github.io/">Live Demo</a> • 
     <a href="#-features-at-a-glance">Features</a> • 

assets/icon.png

@@ -0,0 +1,20 @@
+# CHANGELOG — Rebrand Icon & Tagline
+
+## Summary
+Replaced the old "M" logo with a new handwritten chalk-style "textAgent" icon and updated the tagline.
+
+## What Changed
+
+### `assets/icon.png` (NEW)
+- New handwritten chalk calligraphy "textAgent" icon on dark navy chalkboard background
+
+### `README.md`
+- Tagline changed: "AI-Powered Markdown Editor & Viewer" → "Write with AI Agents — Markdown Editor & Viewer"
+- Icon reference updated from `icon.jpg` to `icon.png`
+
+### `index.html`
+- og:image, twitter:image, and favicon updated from `icon.jpg` to `icon.png`
+- Favicon MIME type fixed from `image/jpg` to `image/png`
+
+### `package.json`
+- Description updated to match new tagline

changelogs/CHANGELOG-rebrand-icon.md

@@ -38,18 +38,18 @@
     <meta property="og:title" content="TextAgent">
     <meta property="og:description"
         content="TextAgent is a powerful GitHub-style Markdown rendering tool with AI assistant, live preview, LaTeX math, Mermaid diagrams, syntax highlighting, dark mode, and export options to PDF, HTML, and MD—all fully client-side and secure.">
-    <meta property="og:image" content="https://textagent.github.io/assets/icon.jpg">
+    <meta property="og:image" content="https://textagent.github.io/assets/icon.png">
 
     <!-- Twitter -->
     <meta property="twitter:card" content="summary_large_image">
     <meta property="twitter:url" content="https://textagent.github.io/">
     <meta property="twitter:title" content="TextAgent">
     <meta property="twitter:description"
         content="TextAgent is a powerful GitHub-style Markdown rendering tool with AI assistant, live preview, LaTeX math, Mermaid diagrams, syntax highlighting, dark mode, and export options to PDF, HTML, and MD—all fully client-side and secure.">
-    <meta property="twitter:image" content="https://textagent.github.io/assets/icon.jpg">
+    <meta property="twitter:image" content="https://textagent.github.io/assets/icon.png">
 
     <title>TextAgent</title>
-    <link href="assets/icon.jpg" rel="icon" type="image/jpg">
+    <link href="assets/icon.png" rel="icon" type="image/png">
 
     <!-- Anti-flicker: set theme BEFORE any CSS/JS loads -->
     <script>
@@ -564,8 +564,8 @@ <h5>Menu</h5>
                 <button id="qab-help" class="qab-btn" title="Help Mode">
                     <i class="bi bi-question-circle"></i> Help
                 </button>
-                <a href="https://github.com/Textagent/textagent.github.io/issues" class="qab-btn"
-                    title="Open Issues" target="_blank" rel="noopener noreferrer"
+                <a href="https://github.com/Textagent/textagent.github.io/issues" class="qab-btn" title="Open Issues"
+                    target="_blank" rel="noopener noreferrer"
                     style="text-decoration:none;color:inherit;font-size:0.55rem;padding:2px 6px;white-space:normal;text-align:center;line-height:1.1;max-width:3.2rem">
                     <i class="bi bi-bug"></i> Open Issues
                 </a>

index.html

@@ -1,7 +1,7 @@
 {
   "name": "textagent",
   "version": "1.0.0",
-  "description": "AI-Powered Markdown Editor & Viewer",
+  "description": "Write with AI Agents — Markdown Editor & Viewer",
   "private": true,
   "type": "module",
   "scripts": {