feat: send nothing to TypeSafe when an import's header row holds an address, date or number, skip placeholder Column N headers, accept only the options each column was offered, never infer Subscribed, Categories or Email, prefer an exact existing field name before a folded match on the server as the client does, compute value kinds once per preview, and make Enter in the empty field search a no-op

web/src/components/app/contacts/ImportWizard.tsx

@@ -800,8 +800,14 @@ export function TargetPicker({
         onChange({ index: value.index, target: "custom", custom_key: name });
     }
 
+    // Enter takes an exact name first, then the first match; with nothing
+    // typed it does nothing, so it can never remap a column by accident.
     function pickFirst() {
-        if (standard.length > 0) pickStandard(standard[0].id);
+        if (q === "") return;
+        const exactStd = standard.find((t) => t.label.toLowerCase() === q.toLowerCase());
+        if (exactStd) pickStandard(exactStd.id);
+        else if (existingKeys.includes(q)) pickExisting(q);
+        else if (standard.length > 0) pickStandard(standard[0].id);
         else if (custom.length > 0) pickExisting(custom[0]);
         else if (canCreate) pickNew(q);
         else return;

web/src/components/app/contacts/importShared.test.ts

@@ -96,6 +96,7 @@ describe("existing custom fields", () => {
     it("folds the way the server does", () => {
         expect(foldCustomKey(" Company.URL ")).toBe("companyurl");
         expect(foldCustomKey("Revenue ($)")).toBe("revenue");
+        expect(foldCustomKey("Area m²")).toBe("aream²");
     });
 
     it("reads both spellings of a custom mapping", () => {