feat(email): allow dismissing entity suggestions

backend/tests/emailEntitySuggestions.test.ts

@@ -1,6 +1,12 @@
 import assert from "node:assert/strict"
 import test from "node:test"
-import { buildSuggestionMail, selectCandidates, validateSuggestions, type EntityCandidate } from "../src/modules/email/email.entity-suggestions"
+import {
+    buildSuggestionMail,
+    dismissEntitySuggestion,
+    selectCandidates,
+    validateSuggestions,
+    type EntityCandidate,
+} from "../src/modules/email/email.entity-suggestions"
 
 const customer: EntityCandidate = { entityType: "customers", entityId: 1, entityName: "Muster GmbH", entityTypeLabel: "Kunde", email: "kontakt@muster.de" }
 const project: EntityCandidate = { entityType: "projects", entityId: 1, entityName: "Umbau", entityTypeLabel: "Projekt", number: "P-2026-123" }
@@ -54,3 +60,12 @@ test("recipient and CC headers neither reach the model nor affect candidate rank
     assert.equal(ranked[0], customer)
     assert.equal(ranked[1], project)
 })
+
+test("dismisses only the selected entity suggestion", () => {
+    const projectSuggestion = { ...suggestion, entityType: "projects" as const, reason: "Projektnummer stimmt überein." }
+    assert.deepEqual(
+        dismissEntitySuggestion([suggestion, projectSuggestion], "customers", 1),
+        [projectSuggestion],
+    )
+    assert.deepEqual(dismissEntitySuggestion(null, "customers", 1), [])
+})