Fully implement Kavenegar SMS support

Core changes:
- ISmsService: add SendBulkAsync (batches of 200) + GetAccountInfoAsync
- KavenegarSmsService: POST requests, sender number config, bulk send
  via comma-separated receptors, account balance, full error code mapping
  (HTTP 400-432), enabled-flag check before any send
- SmsMarketingService: replaced per-recipient loop with SendBulkAsync
- SmsController: new GET /sms/balance endpoint returns Kavenegar credit
- SmsDtos: SmsBalanceDto
- IntegrationDtos + PlatformIntegrationService: SenderNumber field
- appsettings.json + docker-compose: Kavenegar__SenderNumber = 90005671

Dashboard:
- sms-screen: char counter, SMS parts indicator (Persian 70/67 chars,
  Latin 160/153), account balance card, sender line display, result banner

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/dashboard/src/components/sms/sms-screen.tsx

@@ -1,34 +1,57 @@
 "use client";
 
-import { useState } from "react";
+import { useMemo, useState } from "react";
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
-import { useTranslations } from "next-intl";
+import { useTranslations, useLocale } from "next-intl";
+import { MessageSquare, Zap, Users } from "lucide-react";
 import { apiGet, apiPost } from "@/lib/api/client";
-import type { CustomerGroup, SmsCampaignResult, SmsUsage } from "@/lib/api/types";
+import type { CustomerGroup, SmsCampaignResult, SmsUsage, SmsBalance } from "@/lib/api/types";
 import { useAuthStore } from "@/lib/stores/auth.store";
 import { formatNumber } from "@/lib/format";
 import { Button } from "@/components/ui/button";
 import { LabeledField } from "@/components/ui/labeled-field";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import { cn } from "@/lib/utils";
 
 const GROUPS: (CustomerGroup | "all")[] = ["all", "Regular", "Vip", "New", "Employee"];
 
+/** Kavenegar SMS character limits. */
+function calcSmsParts(text: string): { chars: number; parts: number } {
+  const chars = text.length;
+  if (chars === 0) return { chars: 0, parts: 0 };
+  // Persian / Arabic chars → use 70-char parts (single) / 67-char parts (multi)
+  const hasPersian = /[؀-ۿ]/.test(text);
+  const single = hasPersian ? 70 : 160;
+  const multi  = hasPersian ? 67 : 153;
+  const parts = chars <= single ? 1 : Math.ceil(chars / multi);
+  return { chars, parts };
+}
+
 export function SmsScreen() {
-  const t = useTranslations("sms");
+  const t    = useTranslations("sms");
   const tCrm = useTranslations("crm");
+  const locale = useLocale();
   const cafeId = useAuthStore((s) => s.user?.cafeId);
   const queryClient = useQueryClient();
 
   const [message, setMessage] = useState("");
-  const [target, setTarget] = useState<CustomerGroup | "all">("all");
-  const [result, setResult] = useState<SmsCampaignResult | null>(null);
+  const [target, setTarget]   = useState<CustomerGroup | "all">("all");
+  const [result, setResult]   = useState<SmsCampaignResult | null>(null);
 
+  // ── API queries ─────────────────────────────────────────────────────────────
   const { data: usage } = useQuery({
     queryKey: ["sms-usage", cafeId],
     queryFn: () => apiGet<SmsUsage>(`/api/cafes/${cafeId}/sms/usage`),
     enabled: !!cafeId,
   });
 
+  const { data: balance } = useQuery({
+    queryKey: ["sms-balance", cafeId],
+    queryFn: () => apiGet<SmsBalance>(`/api/cafes/${cafeId}/sms/balance`),
+    enabled: !!cafeId,
+    staleTime: 60_000,
+  });
+
   const sendCampaign = useMutation({
     mutationFn: () =>
       apiPost<SmsCampaignResult>(`/api/cafes/${cafeId}/sms/campaign`, {
@@ -39,35 +62,92 @@ export function SmsScreen() {
       setResult(data);
       setMessage("");
       queryClient.invalidateQueries({ queryKey: ["sms-usage", cafeId] });
+      queryClient.invalidateQueries({ queryKey: ["sms-balance", cafeId] });
     },
   });
 
-  if (!cafeId) return null;
+  // ── Derived state ────────────────────────────────────────────────────────────
+  const { chars, parts } = useMemo(() => calcSmsParts(message), [message]);
+
+  const usagePct = useMemo(() => {
+    if (!usage || usage.monthlyLimit <= 0) return null;
+    return Math.min(100, Math.round((usage.usedThisMonth / usage.monthlyLimit) * 100));
+  }, [usage]);
 
   const usageLabel =
     usage?.monthlyLimit === -1
       ? t("unlimited")
-      : `${formatNumber(usage?.usedThisMonth ?? 0)} / ${formatNumber(usage?.monthlyLimit ?? 0)}`;
+      : `${formatNumber(usage?.usedThisMonth ?? 0, locale)} / ${formatNumber(usage?.monthlyLimit ?? 0, locale)}`;
+
+  if (!cafeId) return null;
 
   return (
-    <div className="space-y-4">
+    <div className="mx-auto max-w-2xl space-y-4">
       <h2 className="text-xl font-bold">{t("title")}</h2>
 
-      <Card>
-        <CardHeader>
-          <CardTitle className="text-base">{t("usage")}</CardTitle>
-        </CardHeader>
-        <CardContent>
-          <p className="text-2xl font-semibold text-primary">{usageLabel}</p>
-        </CardContent>
-      </Card>
+      {/* ── Status row ──────────────────────────────────────────────────────── */}
+      <div className="grid grid-cols-2 gap-3 sm:grid-cols-3">
+        {/* Usage */}
+        <Card>
+          <CardContent className="p-4">
+            <p className="mb-1 flex items-center gap-1.5 text-xs font-medium text-muted-foreground">
+              <MessageSquare className="h-3.5 w-3.5" />
+              {t("usage")}
+            </p>
+            <p className="text-lg font-bold tabular-nums text-foreground">{usageLabel}</p>
+            {usagePct !== null && (
+              <div className="mt-1.5 h-1.5 w-full overflow-hidden rounded-full bg-muted">
+                <div
+                  className={cn(
+                    "h-full rounded-full transition-all",
+                    usagePct >= 90 ? "bg-destructive" : "bg-primary"
+                  )}
+                  style={{ width: `${usagePct}%` }}
+                />
+              </div>
+            )}
+          </CardContent>
+        </Card>
 
+        {/* Balance */}
+        <Card>
+          <CardContent className="p-4">
+            <p className="mb-1 flex items-center gap-1.5 text-xs font-medium text-muted-foreground">
+              <Zap className="h-3.5 w-3.5" />
+              {t("balance")}
+            </p>
+            {balance?.isConfigured ? (
+              <p className="text-lg font-bold tabular-nums text-foreground">
+                {t("balanceAmount", { amount: formatNumber(balance.remainCredit, locale) })}
+              </p>
+            ) : (
+              <p className="text-sm text-muted-foreground">{t("balanceNotConfigured")}</p>
+            )}
+          </CardContent>
+        </Card>
+
+        {/* Sender */}
+        <Card className="hidden sm:block">
+          <CardContent className="p-4">
+            <p className="mb-1 flex items-center gap-1.5 text-xs font-medium text-muted-foreground">
+              <Users className="h-3.5 w-3.5" />
+              {t("sender")}
+            </p>
+            <p className="text-lg font-bold tabular-nums tracking-wider text-foreground" dir="ltr">
+              90005671
+            </p>
+          </CardContent>
+        </Card>
+      </div>
+
+      {/* ── Campaign form ────────────────────────────────────────────────────── */}
       <Card>
         <CardContent className="space-y-4 pt-6">
+          {/* Target group */}
           <LabeledField label={t("targetGroup")} htmlFor="sms-target">
             <select
               id="sms-target"
-              className="w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
+              className="w-full cursor-pointer rounded-md border border-input bg-background px-3 py-2 text-sm transition-colors hover:border-primary focus:outline-none focus:ring-2 focus:ring-ring"
               value={target}
               onChange={(e) => setTarget(e.target.value as CustomerGroup | "all")}
             >
@@ -78,25 +158,78 @@ export function SmsScreen() {
               ))}
             </select>
           </LabeledField>
+
+          {/* Message textarea with char counter */}
           <LabeledField label={t("message")} htmlFor="sms-message">
-            <textarea
-              id="sms-message"
-              className="min-h-[120px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
-              value={message}
-              onChange={(e) => setMessage(e.target.value)}
-            />
+            <div className="relative">
+              <textarea
+                id="sms-message"
+                className="min-h-[120px] w-full rounded-md border border-input bg-background px-3 py-2 text-sm transition-colors hover:border-primary focus:outline-none focus:ring-2 focus:ring-ring"
+                value={message}
+                onChange={(e) => setMessage(e.target.value)}
+                placeholder={t("messagePlaceholder")}
+                dir="auto"
+              />
+              {/* Character counter */}
+              {chars > 0 && (
+                <div className="mt-1 flex items-center justify-between text-xs text-muted-foreground">
+                  <span
+                    className={cn(
+                      "tabular-nums",
+                      chars > 336 && "text-destructive"
+                    )}
+                  >
+                    {t("charCount", { count: chars })}
+                  </span>
+                  <span
+                    className={cn(
+                      "rounded-full border px-2 py-0.5 font-semibold tabular-nums",
+                      parts === 1
+                        ? "border-primary/30 bg-primary/10 text-primary"
+                        : parts <= 3
+                          ? "border-amber-400/40 bg-amber-50 text-amber-700"
+                          : "border-destructive/40 bg-destructive/10 text-destructive"
+                    )}
+                  >
+                    {t("smsPartsHint", { parts })}
+                  </span>
+                </div>
+              )}
+            </div>
           </LabeledField>
+
+          {/* Send button */}
           <Button
             className="w-full"
             disabled={!message.trim() || sendCampaign.isPending}
             onClick={() => sendCampaign.mutate()}
           >
-            {t("send")}
+            {sendCampaign.isPending ? t("sending") : t("send")}
           </Button>
+
+          {/* Result banner */}
           {result && (
-            <p className="text-center text-sm text-muted-foreground">
-              {t("sent")}: {formatNumber(result.sentCount)} — {t("failed")}:{" "}
-              {formatNumber(result.failedCount)}
+            <div
+              className={cn(
+                "rounded-lg border px-4 py-3 text-center text-sm",
+                result.failedCount === 0
+                  ? "border-green-200 bg-green-50 text-green-800"
+                  : "border-amber-200 bg-amber-50 text-amber-800"
+              )}
+            >
+              <span className="font-semibold">{t("sent")}: {formatNumber(result.sentCount, locale)}</span>
+              {result.failedCount > 0 && (
+                <span className="ms-3 opacity-75">
+                  {t("failed")}: {formatNumber(result.failedCount, locale)}
+                </span>
+              )}
+            </div>
+          )}
+
+          {/* Error banner */}
+          {sendCampaign.isError && (
+            <p className="rounded-lg border border-destructive/30 bg-destructive/10 px-4 py-3 text-center text-sm text-destructive">
+              {(sendCampaign.error as Error).message}
             </p>
           )}
         </CardContent>