refactor(tgbot): make the add-client expiry presets say what they do (#6503)

* refactor(tgbot): make the add-client expiry presets say what they do

The wizard's "Add N days" buttons were a copy of the renewal handler, whose
accumulate branch they cleared two lines later: the branch tested a value the
line above had just set to zero, so it was dead and only the "set N days from
first use" path was reachable. That reads as an accident, and the automated
review of #6499 flagged it twice.

The wizard keeps the term it sets, which is now the code: a create flow has no
expiry to add to, the custom keypad lands in this same case, and a corrected
number has to replace the one it follows. 0 stays the Unlimited button. The
renewal handler (reset_exp_c) genuinely adds to the client's remaining time and
is unchanged.

* refactor(tgbot): fold in the review of the expiry-preset change

The test now starts every row from a term a preset could have left, so each row
fails on its own under the accumulate semantics rather than depending on the row
before it, and it reuses the package's draft helpers instead of a second copy.
The wizard presets drop the "Add" verb they never honoured; the renewal
keyboard keeps it, where reset_exp_c really does add to the remaining time.

internal/web/service/tgbot/tgbot_draft_render_test.go

@@ -3,11 +3,7 @@ package tgbot
 import (
 	"encoding/json"
 	"html"
-	"io"
-	"net/http"
-	"net/http/httptest"
 	"strings"
-	"sync"
 	"testing"
 
 	"github.com/mhsanaei/3x-ui/v3/internal/web/locale"
@@ -49,57 +45,26 @@ func TestClientDraftMessageRendersHTML(t *testing.T) {
 	}
 }
 
-// botPromptLocalizer renders the two prompts the callback tests drive, with the
+// draftLocalizer registers only the messages a wizard test drives, with the
 // templates the translation files carry; without it I18n returns the bare key.
-func botPromptLocalizer(t *testing.T) {
+func draftLocalizer(t *testing.T, msgs ...*i18n.Message) {
 	t.Helper()
 	bundle := i18n.NewBundle(language.MustParse("en-US"))
 	bundle.RegisterUnmarshalFunc("json", json.Unmarshal)
-	_ = bundle.AddMessages(language.MustParse("en-US"),
-		&i18n.Message{ID: "tgbot.messages.email_prompt", Other: "📧 Default Email: {{ .ClientEmail }}\n\nEnter your email."},
-		&i18n.Message{ID: "tgbot.messages.comment_prompt", Other: "💬 Default Comment: {{ .ClientComment }}\n\nEnter your comment."},
-	)
+	_ = bundle.AddMessages(language.MustParse("en-US"), msgs...)
 	orig := locale.LocalizerBot
 	t.Cleanup(func() { locale.LocalizerBot = orig })
 	locale.LocalizerBot = i18n.NewLocalizer(bundle, "en-US")
 }
 
-// promptTexts serves the methods these prompts touch and returns the text of
-// every sendMessage, so a test can check what Telegram would actually parse.
-func promptTexts(t *testing.T) (string, func() []string) {
-	t.Helper()
-	var mu sync.Mutex
-	var texts []string
-	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		body, _ := io.ReadAll(r.Body)
-		result := any(true)
-		if r.URL.Path == "/bot"+testBotToken+"/sendMessage" {
-			var payload struct {
-				Text string `json:"text"`
-			}
-			_ = json.Unmarshal(body, &payload)
-			mu.Lock()
-			texts = append(texts, payload.Text)
-			mu.Unlock()
-			result = map[string]any{"message_id": 1, "date": 0, "chat": map[string]any{"id": 1, "type": "private"}}
-		}
-		w.Header().Set("Content-Type", "application/json")
-		_ = json.NewEncoder(w).Encode(map[string]any{"ok": true, "result": result})
-	}))
-	t.Cleanup(srv.Close)
-
-	return srv.URL, func() []string {
-		mu.Lock()
-		defer mu.Unlock()
-		return append([]string(nil), texts...)
-	}
-}
-
 // Regression test: the wizard's own prompts are HTML-parsed as well, so the
 // draft value they echo has to be escaped exactly like the draft card.
 func TestAddClientPromptsEscapeDraftValues(t *testing.T) {
-	botPromptLocalizer(t)
-	url, texts := promptTexts(t)
+	draftLocalizer(t,
+		&i18n.Message{ID: "tgbot.messages.email_prompt", Other: "📧 Default Email: {{ .ClientEmail }}\n\nEnter your email."},
+		&i18n.Message{ID: "tgbot.messages.comment_prompt", Other: "💬 Default Comment: {{ .ClientComment }}\n\nEnter your comment."},
+	)
+	url, texts := draftTexts(t)
 	swapTestBot(t, url)
 
 	draft := addClientDrafts.forChat(1)
@@ -130,7 +95,7 @@ func TestAddClientPromptsEscapeDraftValues(t *testing.T) {
 				Message: &telego.Message{Chat: telego.Chat{ID: 1}},
 			}, true) // admin
 
-			sent := texts()
+			sent := texts(1)
 			if len(sent) == 0 {
 				t.Fatalf("no prompt was sent for %s", tc.data)
 			}