feat(app): always show the host picker with Add host on New workspace (#7580)

The Host field used to render only with two or more hosts, and Add host
only appeared on compact layouts. Single-host users had no sign that
Paseo can drive other machines from this screen. The field now always
renders and its menu always ends with Add host.

packages/app/e2e/browser/new-workspace-entry.spec.ts

@@ -95,7 +95,7 @@ test.describe("New workspace entry points", () => {
     }
   });
 
-  test("the New Workspace screen hides the host selector when there is only one host", async ({
+  test("the New Workspace screen shows the host selector with Add host when there is only one host", async ({
     page,
   }) => {
     const seeded: SeededWorkspace = await seedWorkspace({ repoPrefix: "entry-single-host-" });
@@ -120,7 +120,12 @@ test.describe("New workspace entry points", () => {
       await expect(page.getByTestId("new-workspace-project-picker-trigger")).toBeVisible({
         timeout: 30_000,
       });
-      await expect(page.getByTestId("host-picker-trigger")).toHaveCount(0);
+      const hostTrigger = page.getByTestId("host-picker-trigger");
+      await expect(hostTrigger).toContainText("localhost", { timeout: 30_000 });
+      await hostTrigger.click();
+      await expect(page.getByTestId("new-workspace-host-picker-add-host")).toBeVisible();
+      await page.getByTestId("new-workspace-host-picker-add-host").click();
+      await expect(page).toHaveURL(/\/settings\/general\?addHost=/);
     } finally {
       await seeded.cleanup();
     }

packages/app/src/screens/new-workspace/form/index.tsx

@@ -160,7 +160,8 @@ function useRefRenderOption(itemById: Map<string, PickerItem>, isPending: boolea
 /**
  * The New workspace setup fields, one trigger per field, each opening its picker. Compact: a stack
  * of full-width fields with the label inside. Desktop: one meta row of badges. Either way, a field
- * that does not apply to the selected project is left out, and Host only shows with a second host.
+ * that does not apply to the selected project is left out. Host always shows, even with one host, so
+ * its Add host action keeps multi-host discoverable.
  */
 export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement {
   const { t } = useTranslation();
@@ -170,7 +171,6 @@ export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement
   const isolationPicker = useIsolationPicker(isolation, isPending);
   const renderRefOption = useRefRenderOption(base.itemById, isPending);
 
-  const showHost = host.allHosts.length > 1;
   const selectedHostLabel =
     host.allHosts.find((h) => h.serverId === host.selectedServerId)?.label ?? "Host";
   const selectedProject = project.selectedProject;
@@ -214,7 +214,7 @@ export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement
       testID="new-workspace-project-picker-trigger"
     />
   );
-  const hostField = showHost ? (
+  const hostField = (
     <HostPicker
       hosts={host.allHosts}
       value={host.selectedServerId}
@@ -222,8 +222,9 @@ export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement
       open={host.openState}
       onOpenChange={host.onOpenChange}
       anchorRef={host.anchorRef}
-      includeAddHost={isCompact}
+      includeAddHost
       onAddHost={host.onAddHost}
+      addHostTestID="new-workspace-host-picker-add-host"
       searchable={false}
       title={t("newWorkspace.fields.host")}
       desktopPlacement="bottom-start"
@@ -242,7 +243,7 @@ export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement
         testID="host-picker-trigger"
       />
     </HostPicker>
-  ) : null;
+  );
   const isolationField = isolation.canCreateWorktree ? (
     <FieldTrigger
       ref={isolation.anchorRef}
@@ -349,7 +350,7 @@ export function useNewWorkspaceForm(props: NewWorkspaceFormProps): ReactElement
   return (
     <View testID="new-workspace-ref-picker-row" style={styles.desktopRow} pointerEvents="box-none">
       <View style={styles.desktopControl}>{projectField}</View>
-      {hostField ? <View style={styles.desktopControl}>{hostField}</View> : null}
+      <View style={styles.desktopControl}>{hostField}</View>
       {isolationField ? <View style={styles.desktopControl}>{isolationField}</View> : null}
       {baseField ? <View style={styles.desktopControl}>{baseField}</View> : null}
       <View style={styles.launchSpacer} pointerEvents="none" />