Offer archive expiry choices on the target forms, show plain units (closes #396)

Adding or editing a database target now offers the archive expiry
choices of the new webhook page (never, 1h, 12h, 24h, 30d, 90d, 365d)
in place of a text field. The list is defined once, in
internal/handlers/archive_expiry.go, and all three forms render it. The
edit form starts on the expiry it shows: the stored one, or the
submitted one after a refused save. One that is not among the choices
is listed first as its own entry, so saving unchanged keeps it. The
target list shows the expiry in plain units, such as "30 days" or
"12 hours", or "never".

Model: opus-5-5

internal/server/alpine_browser_test.go

@@ -71,6 +71,7 @@ func TestAlpineRunsUnderTheSecurityPolicy(t *testing.T) {
 	// this order. A new check is one more line here.
 	checkAddEntrypoint(ctx, t, page)
 	checkAddEachTargetType(ctx, t, page)
+	checkArchiveExpiry(ctx, t, page)
 	checkRefusedTarget(ctx, t, page)
 	checkTargetDeliveries(ctx, t, page, target.Name,
 		"0 in total, 0 in the last 24 hours",
@@ -421,6 +422,43 @@ func chooseTargetType(ctx context.Context, t *testing.T, targetType string) {
 		"%s: Add still shows while the form is open", targetType)
 }
 
+// checkArchiveExpiry loads a webhook page and checks that the add
+// target form's archive expiry starts on never, that the database
+// target checkAddTarget added with 720h is listed as 30 days, and that
+// its edit form starts on 720h.
+func checkArchiveExpiry(ctx context.Context, t *testing.T, url string) {
+	t.Helper()
+
+	const expiry = `form[action$="/targets"] select[name="expiry"]`
+
+	row := `//span[text()="added-database"]/ancestor::div[@class="p-4"][1]`
+
+	require.NoError(t, chromedp.Run(ctx, loadPage(url)))
+
+	chooseTargetType(ctx, t, "database")
+
+	var start, edited string
+
+	require.NoError(t, chromedp.Run(
+		ctx, chromedp.Value(expiry, &start, chromedp.ByQuery),
+	))
+	assert.Equal(t, "never", start,
+		"the add target form's archive expiry does not start on never")
+
+	assert.True(t, shown(ctx, row+`//span[text()="Archive Expiry:"]`+
+		`/following-sibling::span[text()="30 days"]`),
+		"a database target added with 720h is not listed as 30 days")
+
+	click(ctx, t, row+`//a[text()="Edit"]`)
+	require.NoError(t, chromedp.Run(
+		ctx,
+		chromedp.WaitReady("#expiry", chromedp.ByQuery),
+		chromedp.Value("#expiry", &edited, chromedp.ByQuery),
+	))
+	assert.Equal(t, "720h", edited,
+		"the edit form does not start on the stored archive expiry")
+}
+
 // checkRefusedTarget submits an http target the server refuses, a
 // loopback destination, and checks that the page comes back with the
 // form open on the http fields, the values entered and the reason, and