Fix post detail page navigation issues

- Updated back button to use JavaScript function instead of direct href
- Added URL parameter preservation when navigating back to feed
- Improved fallback logic to handle browser history properly

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

templates/post_detail.html

@@ -9,7 +9,7 @@
 <main class="main-content single-post">
     <!-- Back Button -->
     <div class="back-section">
-        <a href="{{ url_for('index') }}" class="back-btn">← Back to Feed</a>
+        <a href="#" onclick="goBackToFeed(event)" class="back-btn">← Back to Feed</a>
     </div>
     
     <!-- Post Content -->
@@ -657,13 +657,23 @@
 </style>
 
 <script>
-function goBackToFeed() {
+function goBackToFeed(event) {
+    event.preventDefault();
+
     // Try to go back in browser history first
     if (window.history.length > 1 && document.referrer && document.referrer.includes(window.location.origin)) {
         window.history.back();
     } else {
-        // Fallback to dashboard - use the proper URL
-        window.location.href = {{ url_for('index')|tojson }};
+        // Fallback to dashboard - construct URL with current query parameters
+        const urlParams = new URLSearchParams(window.location.search);
+        const baseUrl = {{ url_for('index')|tojson }};
+
+        // Add query parameters if they exist
+        if (urlParams.toString()) {
+            window.location.href = baseUrl + '?' + urlParams.toString();
+        } else {
+            window.location.href = baseUrl;
+        }
     }
 }