Add unique faces only filter to PhotoTagger. Introduce a checkbox in the Date Filters section to hide duplicates with high/medium confidence matches, enhancing face identification accuracy. Implement filtering logic that groups faces with ≥60% confidence, ensuring only one representative is displayed in the main list while keeping the Similar Faces panel unfiltered. Update README to document this new feature and its behavior.

README.md

@@ -143,6 +143,12 @@ python3 photo_tagger.py auto-match --auto --show-faces
 - ⚡ **Performance Optimized** - Pre-fetched data for faster similar faces display
 - 🎯 **Clean Database Storage** - Names are stored as separate first_name and last_name fields without commas
 - 🔧 **Improved Data Handling** - Fixed field restoration and quit confirmation logic for better reliability
+ - 🧩 **Unique Faces Only Filter (NEW)**
+   - Checkbox in the Date Filters section: "Unique faces only (hide duplicates with high/medium confidence)"
+   - Applies only to the main face list (left/navigation); the Similar Faces panel (right) remains unfiltered
+   - Groups faces with ≥60% confidence matches (Medium/High/Very High) and shows only one representative
+   - Takes effect immediately when toggled (no need to click Apply Filter); Apply Filter is only for date filters
+   - Uses existing database encodings for fast, non-blocking filtering
 
 **🎯 New Auto-Match GUI Features:**
 - 📊 **Person-Centric View** - Shows matched person on left, all their unidentified faces on right
@@ -498,6 +504,17 @@ The Compare feature in the Identify GUI works seamlessly with the main identific
 - **Smart Warnings**: Prevents accidental loss of work
 - **Performance Optimized**: Instant loading of similar faces
 
+### Unique Faces Only Filter
+- Location: in the "Date Filters" bar at the top of the Identify GUI.
+- Behavior:
+  - Filters the main navigation list on the left to avoid showing near-duplicate faces of the same person.
+  - The Similar Faces panel on the right is NOT filtered and continues to show all similar faces for comparison.
+  - Confidence rule: faces that match at ≥60% (Medium/High/Very High) are grouped; only one shows in the main list.
+- Interaction:
+  - Takes effect immediately when toggled. You do NOT need to press Apply Filter.
+  - Apply Filter continues to control the date filters only (Taken/Processed ranges).
+  - Filtering uses precomputed encodings from the database, so it is fast and non-blocking.
+
 ### Auto-Match Workflow
 The auto-match feature now works in a **person-centric** way: