Add duplicate profile merge and share deep-link routing

docs/SETUP.md

@@ -101,10 +101,16 @@ Behavior notes:
   - moment history (`type=whatsapp`)
 - ambiguous or missing-identity shares are queued in `Share Inbox` for manual
   resolution
+- app launch from initial share intent auto-opens the relevant destination:
+  - resolved import -> `People` with imported profile selected
+  - unresolved import -> `Share Inbox`
 - Settings includes:
   - `Simulate WhatsApp Share` for local/dev testing
   - `Open Share Inbox` to resolve queued items
 
+People view includes `Merge duplicates` action for resolving duplicate profile
+records after import.
+
 ## Local Persistence Backend
 
 Default local store: