Subscription store, paywall on locked units, profile subscription bar, Tadrisino branding

- Store opens with two choices (subscription / question packs); 3- and 6-month cards
  show per-month price and saving.
- Units that need a subscription show a crown badge and open the store; a 402 from
  the quiz goes there too. «ادامه بده» skips locked units.
- Profile: subscription card with an animated days-left bar (planDurationDays).
- BrandMark (SVG) on splash, home header and footer; copyright footer; floating math
  glyphs on splash. CSS transform/opacity only; honours reduced motion.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/screens/HomeScreen.tsx

@@ -1,5 +1,5 @@
 import { useEffect, useRef, useState } from 'react';
-import { Bell, ChevronLeft, Coins, Flame, Hand, PartyPopper, Star } from 'lucide-react';
+import { Bell, ChevronLeft, Coins, Crown, Flame, Hand, PartyPopper, Star } from 'lucide-react';
 import type { HomeNode } from '@/api';
 import { useAppData } from '@/state/AppData';
 import { findContinue, unitColor, unitProgress } from '@/state/curriculum';
@@ -11,6 +11,8 @@ import { EmptyState, ErrorState, LoadingState, Screen, Sep } from '@/components/
 import { onWhite, shade } from '@/lib/color';
 import { toFa } from '@/lib/format';
 import { MathText } from '@/lib/MathText';
+import { BrandFooter } from '@/components/BrandFooter';
+import { BrandMark } from '@/components/BrandMark';
 
 /**
  * خانه = خودِ مسیر، مثلِ دولینگو: همه‌ی فصل‌های پایه پشتِ هم، و جزیره‌ی فعلی با
@@ -20,6 +22,8 @@ import { MathText } from '@/lib/MathText';
 export function HomeScreen() {
   const { profile, gradeTitle, summary, home, homeError, companion, unreadCount, refreshHome } = useAppData();
   const nav = useNav();
+  // فصلِ غیرِ اول بی‌اشتراک: زدنِ جزیره یک‌راست فهرستِ اشتراک‌ها را باز می‌کند.
+  const paywall = () => nav.push({ name: 'subscription', view: 'subscription' });
   const [openNode, setOpenNode] = useState<{ node: HomeNode; color: string } | null>(null);
   const currentRef = useRef<HTMLDivElement>(null);
   const scrolled = useRef(false);
@@ -52,6 +56,7 @@ export function HomeScreen() {
     <Screen>
       <header className="relative z-20 flex-shrink-0 rounded-b-[28px] bg-coral px-4 pb-4 pt-safe text-white shadow-md shadow-coral/20">
         <div className="flex items-center gap-2 pt-4">
+          <BrandMark size={26} withName={false} />
           {gradeTitle && (
             <button type="button" onClick={() => nav.switchTab('profile')} className="hit rounded-full bg-white/20 px-3 py-1.5 text-xs font-black active:scale-95">
               {gradeTitle}
@@ -111,6 +116,7 @@ export function HomeScreen() {
                     <div className="min-w-0 flex-1">
                       <div className="text-[11px] font-bold text-white/80">
                         فصلِ {toFa(i + 1)}<Sep />{toFa(p.done)} از {toFa(p.total)} جزیره
+                        {unit.requiresSubscription && <span className="mr-1.5 inline-flex h-5 items-center gap-1 rounded-full bg-white/25 px-2 align-middle leading-none"><Crown size={11} /> با اشتراک</span>}
                         {isCurrentUnit && <span className="mr-1.5 inline-flex h-5 items-center rounded-full bg-white/25 px-2 align-middle leading-none">الان اینجایی</span>}
                       </div>
                       <div className="mt-0.5 truncate text-[15px] font-black">{unit.title.replace(/^فصل\s*\S+\s*[:：]\s*/, '')}</div>
@@ -123,13 +129,14 @@ export function HomeScreen() {
                       nodes={unit.nodes}
                       color={color}
                       currentId={isCurrentUnit ? cont!.node.id : null}
-                      onOpen={(node) => setOpenNode({ node, color })}
-                      onStart={(node) => nav.push({ name: 'quiz', nodeId: node.id })}
+                      onOpen={(node) => (unit.requiresSubscription ? paywall() : setOpenNode({ node, color }))}
+                      onStart={(node) => (unit.requiresSubscription ? paywall() : nav.push({ name: 'quiz', nodeId: node.id }))}
                     />
                   </div>
                 </section>
               );
             })}
+            <BrandFooter />
           </div>
         )}
       </div>