fix(email): ignore recipient headers in entity suggestions

backend/db/migrations/0069_reset_email_entity_suggestions.sql

@@ -0,0 +1,2 @@
+-- Recompute suggestions without recipient evidence on next opening. Existing links remain intact.
+UPDATE "email_messages" SET "entity_suggestions" = NULL WHERE "entity_suggestions" IS NOT NULL;

backend/db/migrations/meta/_journal.json

@@ -463,6 +463,13 @@
       "when": 1788802000000,
       "tag": "0068_email_entity_suggestions",
       "breakpoints": true
+    },
+    {
+      "idx": 66,
+      "version": "7",
+      "when": 1788803000000,
+      "tag": "0069_reset_email_entity_suggestions",
+      "breakpoints": true
     }
   ]
 }