fix(connection): Happ TV quick-connect is Happ-only + matches config-block styles

The TV quick-connect block (Подключить TV / Сканировать QR) is a Happ-only
feature (check.happ.su/sendtv), but it rendered for ANY app on a TV platform and
used one-off button styles (solid btn-primary + grey btn-secondary) that clashed
with the outlined-accent buttons that come from the subscription-page config.

- Show TvQuickConnect only for the Happ app (detected by its happ:// deep-link
  scheme, name as fallback).
- Extract the config-block button style into a shared blockButtonClass and use it
  for the TV buttons too, so they adapt to exactly the same visual language as the
  panel-config blocks (no divergent one-off styling).
- Align the code input with the Happ Android TV API doc (5-digit numeric):
  placeholder 12345 + inputMode numeric. The send call already matches the spec
  (POST check.happ.su/sendtv/{code}, body {"data": base64(subscriptionUrl)}).

src/components/connection/InstallationGuide.tsx

@@ -34,6 +34,14 @@ const RENDERERS: Record<string, React.ComponentType<BlockRendererProps>> = {
   minimal: MinimalBlock,
 };
 
+/** TV quick-connect is a Happ-only feature (check.happ.su/sendtv) — show it only
+ *  for the Happ app, detected by its happ:// deep-link scheme (name as fallback). */
+function isHappApp(app: RemnawaveAppClient | null): boolean {
+  if (!app) return false;
+  if ((app.deepLink ?? '').toLowerCase().startsWith('happ://')) return true;
+  return app.name.toLowerCase().includes('happ');
+}
+
 interface Props {
   appConfig: AppConfig;
   onOpenDeepLink: (url: string) => void;
@@ -312,8 +320,9 @@ export default function InstallationGuide({
         </a>
       )}
 
-      {/* Blocks — for TV: first block, Quick Connect, last block */}
-      {selectedApp && isTvPlatform && appConfig.subscriptionUrl ? (
+      {/* Blocks — for the Happ TV app: first block, Quick Connect, last block.
+          Other apps (or non-TV) render their blocks normally. */}
+      {selectedApp && isTvPlatform && isHappApp(selectedApp) && appConfig.subscriptionUrl ? (
         <>
           {selectedApp.blocks.length > 0 && (
             <Renderer

src/components/connection/TvQuickConnect.tsx

@@ -5,6 +5,7 @@ import {
   isQrScannerSupported,
   retrieveLaunchParams,
 } from '@telegram-apps/sdk-react';
+import { blockButtonClass } from './blocks/buttonStyles';
 
 const TG_MOBILE_PLATFORMS = new Set(['ios', 'android', 'android_x', 'ios_x']);
 
@@ -198,6 +199,10 @@ export default function TvQuickConnect({ subscriptionUrl, isLight }: Props) {
     ? 'w-full rounded-xl border border-dark-700/60 bg-white px-4 py-3 text-center text-2xl font-bold tracking-[0.3em] uppercase text-dark-100 outline-none focus:border-accent-500 focus:ring-1 focus:ring-accent-500'
     : 'w-full rounded-xl border border-dark-700 bg-dark-900/50 px-4 py-3 text-center text-2xl font-bold tracking-[0.3em] uppercase text-dark-100 outline-none focus:border-accent-500 focus:ring-1 focus:ring-accent-500';
 
+  // Full-width buttons in the same outlined-accent language as the config blocks
+  // (so the Happ TV block adapts to the subscription-page styles, not a one-off).
+  const actionBtnClass = `${blockButtonClass('light', isLight)} flex w-full items-center justify-center`;
+
   return (
     <div className="space-y-3">
       {/* Code input */}
@@ -232,15 +237,15 @@ export default function TvQuickConnect({ subscriptionUrl, isLight }: Props) {
                 maxLength={5}
                 value={code}
                 onChange={(e) => setCode(e.target.value.toUpperCase().replace(/[^A-Z0-9]/g, ''))}
-                placeholder="A1B2C"
+                placeholder="12345"
                 autoComplete="one-time-code"
-                inputMode="text"
+                inputMode="numeric"
                 className={inputClass}
               />
               <button
                 onClick={() => sendToTV(code)}
                 disabled={sending || code.length !== 5}
-                className="btn-primary w-full justify-center py-3 disabled:opacity-50"
+                className={`${actionBtnClass} disabled:opacity-50`}
               >
                 {sending ? (
                   <div className="h-5 w-5 animate-spin rounded-full border-2 border-white/30 border-t-white" />
@@ -285,7 +290,7 @@ export default function TvQuickConnect({ subscriptionUrl, isLight }: Props) {
             </p>
 
             {!scanning && (
-              <button onClick={startScan} className="btn-secondary mt-3 w-full justify-center py-3">
+              <button onClick={startScan} className={`${actionBtnClass} mt-3`}>
                 <svg
                   className="mr-2 h-5 w-5"
                   fill="none"
@@ -310,7 +315,7 @@ export default function TvQuickConnect({ subscriptionUrl, isLight }: Props) {
             <div className={scanning ? 'mt-3 space-y-2' : 'hidden'}>
               <div id="tv-qr-reader" className="overflow-hidden rounded-xl" />
               {scanning && (
-                <button onClick={stopScan} className="btn-secondary w-full justify-center py-2.5">
+                <button onClick={stopScan} className={actionBtnClass}>
                   {t('subscription.tvQuickConnect.stopScan')}
                 </button>
               )}

src/components/connection/blocks/BlockButtons.tsx

@@ -3,6 +3,7 @@ import { useTranslation } from 'react-i18next';
 import { CheckIcon, CopyIcon } from '@/components/icons';
 import type { RemnawaveButtonClient, LocalizedText } from '@/types';
 import { copyToClipboard } from '@/utils/clipboard';
+import { blockButtonClass } from './buttonStyles';
 
 // eslint-disable-next-line no-script-url
 const dangerousSchemes = ['javascript:', 'data:', 'vbscript:', 'file:'];
@@ -57,14 +58,7 @@ export function BlockButtons({
 
   if (!buttons || buttons.length === 0) return null;
 
-  const baseClass =
-    variant === 'light'
-      ? isLight
-        ? 'rounded-xl border border-accent-500/50 px-4 py-2 text-sm font-medium text-accent-600 shadow-sm transition-all hover:bg-accent-500/10'
-        : 'rounded-xl border border-accent-500/40 px-4 py-2 text-sm font-medium text-accent-400 transition-all hover:bg-accent-500/10'
-      : isLight
-        ? 'rounded-xl px-3 py-1.5 text-sm font-medium text-dark-300 transition-all hover:bg-dark-700/30'
-        : 'rounded-xl px-3 py-1.5 text-sm font-medium text-dark-300 transition-all hover:bg-dark-700/50';
+  const baseClass = blockButtonClass(variant, isLight);
 
   return (
     <div className="mt-3 flex flex-wrap gap-2">

src/components/connection/blocks/buttonStyles.ts

@@ -0,0 +1,16 @@
+/**
+ * Shared button styling for connection blocks. The config-driven blocks
+ * (BlockButtons) and the Happ TV quick-connect both render through this so the
+ * latter adapts to exactly the same visual language as the styles coming from
+ * the subscription-page config — no divergent one-off button styles.
+ */
+export function blockButtonClass(variant: 'light' | 'subtle', isLight?: boolean): string {
+  if (variant === 'light') {
+    return isLight
+      ? 'rounded-xl border border-accent-500/50 px-4 py-2 text-sm font-medium text-accent-600 shadow-sm transition-all hover:bg-accent-500/10'
+      : 'rounded-xl border border-accent-500/40 px-4 py-2 text-sm font-medium text-accent-400 transition-all hover:bg-accent-500/10';
+  }
+  return isLight
+    ? 'rounded-xl px-3 py-1.5 text-sm font-medium text-dark-300 transition-all hover:bg-dark-700/30'
+    : 'rounded-xl px-3 py-1.5 text-sm font-medium text-dark-300 transition-all hover:bg-dark-700/50';
+}