Add person editor validation and duplicate warnings

docs/progress.md

@@ -7,6 +7,25 @@ Updated: 2026-02-22
 - After every sensible code/documentation change set, create a git commit as
   the last step so the next agent session can pick up from clean checkpoints.
 
+## Latest Milestone (2026-02-22): Person Editor Inline Validation + Duplicate Warning
+
+Improved the People add/edit profile experience to make validation explicit and
+support safer profile creation in a sharing-first workflow.
+
+- `lib/features/people/people_view.dart`
+  - added inline required-field validation for `Name` and `Relationship`
+    (no more silent no-op when save is pressed with empty required fields)
+  - added live duplicate-name warning banner in add/edit form:
+    - checks normalized profile names against existing local profiles
+    - excludes the current profile during edit
+    - warns before save while still allowing save (with follow-up merge flow)
+  - routed existing profile list into the responsive editor panel/sheet so
+    duplicate detection works on mobile + desktop/web
+
+- Validation
+  - `flutter analyze` -> pass
+  - `flutter test` -> pass
+
 ## Latest Milestone (2026-02-22): Responsive People Add/Edit Form (Sheet + Dialog)
 
 Aligned the People profile creation/edit flow with the newer insights-style UI