Fix Issue #18: Community settings now match admin panel configuration

## Problem Fixed:
Community selection in settings was using hardcoded list that didn't match the actual enabled communities in the admin panel's collection_targets configuration.

## Root Cause:
The settings_communities() function had a hardcoded list of only 6 communities, while platform_config.json defines many more communities and collection_targets specifies which ones are actually enabled.

## Solution:
- **Dynamic community loading** - Reads from platform_config.json instead of hardcoded list
- **Collection target filtering** - Only shows communities that are in collection_targets (actually being crawled)
- **Complete community data** - Includes display_name, icon, and description from platform config
- **Platform consistency** - Ensures settings match what's configured in admin panel

The community settings now perfectly reflect what's enabled in the admin panel\!

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

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

themes/modern-card-ui/styles.css

@@ -460,6 +460,45 @@ header .post-count::before {
 .engagement-info {
   font-size: 0.9rem;
   color: var(--text-secondary);
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+/* Bookmark Button */
+.bookmark-btn {
+  background: none;
+  border: 1px solid var(--border-color);
+  border-radius: 6px;
+  padding: 6px 12px;
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  color: var(--text-secondary);
+  font-size: 0.85rem;
+}
+
+.bookmark-btn:hover {
+  border-color: var(--primary-color);
+  color: var(--primary-color);
+  background: rgba(77, 182, 172, 0.1);
+}
+
+.bookmark-btn.bookmarked {
+  background: var(--primary-color);
+  color: white;
+  border-color: var(--primary-color);
+}
+
+.bookmark-btn.bookmarked .bookmark-icon {
+  filter: none;
+}
+
+.bookmark-btn:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
 }
 
 /* Tags */