Implement enhanced tag management features in PhotoTagger

This update introduces a comprehensive system for managing photo tags, including the ability to add and remove tags with pending changes tracked until saved. A new tag management dialog allows users to link tags intuitively, featuring a linkage icon for easy access. The interface now supports real-time updates and visual indicators for saved and pending tags, improving user experience. Additionally, the README has been updated to reflect these enhancements and provide clear documentation on the new functionalities.

README.md

@@ -195,6 +195,11 @@ This GUI provides a file explorer-like interface for managing photo tags with ad
 - 🏷️ **Smart Tag Management** - Duplicate tag prevention with silent handling
 - 🔄 **Accurate Change Tracking** - Only counts photos with actual new tags as "changed"
 - 🎯 **Reliable Tag Operations** - Uses tag IDs internally for consistent, bug-free behavior
+- 🔗 **Enhanced Tag Linking** - Linkage icon (🔗) for intuitive tag management
+- 📋 **Comprehensive Tag Dialog** - Manage tags dialog similar to Manage Tags interface
+- ✅ **Pending Tag System** - Add and remove tags with pending changes until saved
+- 🎯 **Visual Status Indicators** - Clear distinction between saved and pending tags
+- 🗑️ **Smart Tag Removal** - Remove both pending and saved tags with proper tracking
 
 **📋 Available View Modes:**
 
@@ -245,6 +250,18 @@ This GUI provides a file explorer-like interface for managing photo tags with ad
 - 🖼️ **Photo Details** - Expanded folders show all photos with their metadata
 - 🔄 **Persistent State** - Folder expansion state is maintained while browsing
 
+**🏷️ Enhanced Tag Management System:**
+- 🔗 **Linkage Icon** - Click the 🔗 button next to tags to open the tag management dialog
+- 📋 **Comprehensive Dialog** - Similar interface to Manage Tags with dropdown selection and tag listing
+- ✅ **Pending Changes** - Add and remove tags with changes tracked until "Save Tagging" is clicked
+- 🎯 **Visual Status** - Tags show "(pending)" in blue or "(saved)" in black for clear status indication
+- 🗑️ **Smart Removal** - Remove both pending and saved tags with proper database tracking
+- 📊 **Batch Operations** - Select multiple tags for removal with checkboxes
+- 🔄 **Real-time Updates** - Tag display updates immediately when changes are made
+- 💾 **Save System** - All tag changes (additions and removals) saved atomically when "Save Tagging" is clicked
+- 🎯 **ID-Based Architecture** - Uses tag IDs internally for efficient, reliable operations
+- ⚡ **Performance Optimized** - Fast tag operations with minimal database queries
+
 **Left Panel (People):**
 - 🔍 **Last Name Search** - Search box to filter people by last name (case-insensitive)
 - 🔎 **Search Button** - Apply filter to show only matching people
@@ -791,6 +808,21 @@ This is now a minimal, focused tool. Key principles:
 - ✅ **Robust Tag Parsing** - Handles edge cases like empty tag strings and malformed data
 - ✅ **Consistent Behavior** - All tag operations use the same reliable logic throughout the application
 
+### 🔗 Enhanced Tag Management Interface (LATEST!)
+- ✅ **Linkage Icon** - Replaced "+" button with intuitive 🔗 linkage icon for tag management
+- ✅ **Comprehensive Tag Dialog** - Redesigned tag management dialog similar to Manage Tags interface
+- ✅ **Dropdown Tag Selection** - Select from existing tags or create new ones via dropdown
+- ✅ **Pending Tag System** - Add and remove tags with changes tracked until explicitly saved
+- ✅ **Visual Status Indicators** - Clear distinction between saved tags (black) and pending tags (blue)
+- ✅ **Smart Tag Removal** - Remove both pending and saved tags with proper database tracking
+- ✅ **Batch Tag Operations** - Select multiple tags for removal with checkboxes
+- ✅ **Real-time UI Updates** - Tag display updates immediately when changes are made
+- ✅ **Atomic Save Operations** - All tag changes (additions and removals) saved in single transaction
+- ✅ **Efficient ID-Based Operations** - Uses tag IDs internally for fast, reliable tag management
+- ✅ **Scrollable Tag Lists** - Handle photos with many tags in scrollable interface
+- ✅ **Immediate Visual Feedback** - Removed tags disappear from UI immediately
+- ✅ **Database Integrity** - Proper cleanup of pending changes when tags are deleted
+
 ### 🎨 Enhanced Modify Identified Interface (NEW!)
 - ✅ **Complete Person Information** - Shows full names with middle names, maiden names, and birth dates
 - ✅ **Last Name Search** - Filter people by last name with case-insensitive search