feat: clean navbar icons, floating theme bubble, auto theme on first visit

- Navbar: remove theme switcher, clean nav icons (no text labels),
  active state is accent dot underline + icon color — no pill bg
- useTheme: drop 'system' from stored type; first visit = auto
  by system preference, stays unset until user explicitly clicks
- ThemeBubble: fixed bottom-right pill with Sun/Moon icon + label,
  hover lift, click toggles light ↔ dark and persists to localStorage
- App.tsx: render ThemeBubble inside ThemeProvider

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

client/src/App.tsx

@@ -5,6 +5,7 @@ import { ThemeProvider } from '@/hooks/useTheme';
 import { ToastProvider } from '@/components/Toast';
 import ProtectedRoute from '@/components/ProtectedRoute';
 import Navbar from '@/components/Navbar';
+import ThemeBubble from '@/components/ThemeBubble';
 import LoginPage from '@/pages/LoginPage';
 import RegisterPage from '@/pages/RegisterPage';
 import FeedPage from '@/pages/FeedPage';
@@ -107,6 +108,7 @@ export default function App() {
         <AuthProvider>
           <ToastProvider>
             <Navbar />
+            <ThemeBubble />
             <main>
               <AnimatedRoutes />
             </main>

client/src/components/Navbar.tsx

@@ -1,26 +1,17 @@
 import { Link, useLocation } from 'react-router-dom';
 import { useAuth } from '@/hooks/useAuth';
-import { useTheme } from '@/hooks/useTheme';
 import UserAvatar from '@/components/UserAvatar';
-import { Home, PlusSquare, Shield, Sun, Moon, Monitor } from 'lucide-react';
+import { Home, PlusSquare, Shield } from 'lucide-react';
 
 export default function Navbar() {
   const { user } = useAuth();
-  const { theme, setTheme } = useTheme();
   const location = useLocation();
 
-  const cycleTheme = () => {
-    const next: Record<string, 'dark' | 'system' | 'light'> = { light: 'dark', dark: 'system', system: 'light' };
-    setTheme(next[theme]);
-  };
-  const ThemeIcon = theme === 'dark' ? Moon : theme === 'light' ? Sun : Monitor;
-  const themeLabel = theme === 'dark' ? 'Тёмная' : theme === 'light' ? 'Светлая' : 'Авто';
-
   if (!user) return null;
 
-  const isProfile = location.pathname.startsWith('/profile');
   const isFeed   = location.pathname === '/feed' || location.pathname === '/';
   const isUpload = location.pathname === '/upload';
+  const isProfile = location.pathname.startsWith('/profile');
 
   return (
     <nav className="sticky top-0 z-50 nav-glass border-b border-[var(--border-light)]">
@@ -36,34 +27,27 @@ export default function Navbar() {
         </Link>
 
         {/* Навигация */}
-        <div className="flex items-center gap-0.5">
-          <NavLink to="/feed" active={isFeed} icon={Home} label="Лента" />
-          <NavLink to="/upload" active={isUpload} icon={PlusSquare} label="Добавить" />
-
-          {/* Переключатель темы */}
-          <button
-            onClick={cycleTheme}
-            title={`Тема: ${themeLabel}`}
-            className="flex flex-col items-center justify-center gap-0.5 h-11 w-11 rounded-xl transition-all text-[var(--fg-tertiary)] hover:text-[var(--fg-secondary)] hover:bg-[var(--border-light)]"
-          >
-            <ThemeIcon className="h-[18px] w-[18px]" strokeWidth={1.5} />
-            <span className="text-[9px] font-semibold uppercase tracking-wide hidden sm:block opacity-60">{themeLabel}</span>
-          </button>
+        <div className="flex items-center gap-1">
+          <NavIcon to="/feed"   active={isFeed}   icon={Home}      label="Лента" />
+          <NavIcon to="/upload" active={isUpload} icon={PlusSquare} label="Добавить" />
 
           {/* Аватар */}
-          <Link to="/profile" className="ml-1 relative flex items-center">
-            <div className={`flex items-center justify-center h-9 w-9 rounded-full transition-all duration-200 ${
+          <Link
+            to="/profile"
+            title="Профиль"
+            className={[
+              'relative ml-1 flex items-center rounded-full transition-all duration-200',
               isProfile
                 ? 'ring-[2.5px] ring-[var(--accent)] ring-offset-2 ring-offset-[var(--bg)]'
-                : 'opacity-80 hover:opacity-100'
-            }`}>
+                : 'opacity-75 hover:opacity-100',
+            ].join(' ')}
+          >
             <UserAvatar
               avatarUrl={user.avatar_url}
               username={user.username}
-                className="h-9 w-9"
+              className="h-8 w-8"
               fallbackClassName="text-[11px] avatar-colored bg-[var(--accent)]"
             />
-            </div>
             {user.is_admin && (
               <span className="absolute -top-0.5 -right-0.5 h-3.5 w-3.5 rounded-full bg-[var(--accent)] flex items-center justify-center ring-2 ring-[var(--bg)]">
                 <Shield className="h-2 w-2 text-white" strokeWidth={3} />
@@ -76,22 +60,27 @@ export default function Navbar() {
   );
 }
 
-function NavLink({
+function NavIcon({
   to, active, icon: Icon, label,
 }: {
-  to: string; active: boolean; icon: any; label: string;
+  to: string; active: boolean; icon: React.ComponentType<any>; label: string;
 }) {
   return (
     <Link
       to={to}
-      className={`flex flex-col items-center justify-center gap-0.5 h-11 w-11 rounded-xl transition-all duration-200 ${
+      title={label}
+      className={[
+        'relative flex items-center justify-center h-9 w-9 rounded-xl',
+        'transition-all duration-200',
         active
-          ? 'bg-[var(--accent-soft)] text-[var(--accent)]'
-          : 'text-[var(--fg-tertiary)] hover:text-[var(--fg-secondary)] hover:bg-[var(--border-light)]'
-      }`}
+          ? 'text-[var(--accent)] bg-[var(--accent-soft)]'
+          : 'text-[var(--fg-tertiary)] hover:text-[var(--fg)] hover:bg-[var(--border-light)]',
+      ].join(' ')}
     >
-      <Icon className="h-[18px] w-[18px]" strokeWidth={active ? 2.2 : 1.5} />
-      <span className="text-[9px] font-semibold uppercase tracking-wide hidden sm:block opacity-70">{label}</span>
+      <Icon className="h-5 w-5" strokeWidth={active ? 2.2 : 1.7} />
+      {active && (
+        <span className="absolute -bottom-[11px] left-1/2 -translate-x-1/2 h-[2.5px] w-4 rounded-full bg-[var(--accent)]" />
+      )}
     </Link>
   );
 }

client/src/components/ThemeBubble.tsx

@@ -0,0 +1,31 @@
+import { Sun, Moon } from 'lucide-react';
+import { useTheme } from '@/hooks/useTheme';
+
+export default function ThemeBubble() {
+  const { resolvedTheme, setTheme } = useTheme();
+  const isDark = resolvedTheme === 'dark';
+
+  return (
+    <button
+      onClick={() => setTheme(isDark ? 'light' : 'dark')}
+      title={isDark ? 'Светлая тема' : 'Тёмная тема'}
+      aria-label="Переключить тему"
+      className={[
+        'fixed bottom-5 right-5 z-40',
+        'flex items-center gap-2 h-10 px-3.5 rounded-full',
+        'border border-[var(--border)]',
+        'bg-[var(--surface)] shadow-[0_4px_20px_rgba(0,0,0,0.18)]',
+        'text-[var(--fg-secondary)] text-xs font-semibold',
+        'transition-all duration-200 ease-out',
+        'hover:shadow-[0_6px_24px_rgba(0,0,0,0.25)] hover:-translate-y-0.5',
+        'active:scale-95 active:translate-y-0',
+        'select-none cursor-pointer backdrop-blur-sm',
+      ].join(' ')}
+    >
+      {isDark
+        ? <><Sun className="h-4 w-4 text-amber-400" strokeWidth={1.8} /><span className="hidden sm:inline">Светлая</span></>
+        : <><Moon className="h-4 w-4 text-indigo-400" strokeWidth={1.8} /><span className="hidden sm:inline">Тёмная</span></>
+      }
+    </button>
+  );
+}

client/src/hooks/useTheme.tsx

@@ -1,28 +1,28 @@
 import { createContext, useContext, useEffect, useState, ReactNode } from 'react';
 
-type Theme = 'light' | 'dark' | 'system';
+type StoredTheme = 'light' | 'dark';
 
 interface ThemeContextValue {
-  theme: Theme;
   resolvedTheme: 'light' | 'dark';
-  setTheme: (t: Theme) => void;
+  setTheme: (t: StoredTheme) => void;
 }
 
 const ThemeContext = createContext<ThemeContextValue>({
-  theme: 'system',
-  resolvedTheme: 'light',
+  resolvedTheme: 'dark',
   setTheme: () => {},
 });
 
 export function ThemeProvider({ children }: { children: ReactNode }) {
-  const [theme, setThemeState] = useState<Theme>(() => {
-    return (localStorage.getItem('theme') as Theme) ?? 'system';
-  });
-
   const [systemDark, setSystemDark] = useState(() =>
     window.matchMedia('(prefers-color-scheme: dark)').matches
   );
 
+  // null = пользователь ещё не выбирал → автоматически по системе
+  const [explicit, setExplicit] = useState<StoredTheme | null>(() => {
+    const saved = localStorage.getItem('theme');
+    return saved === 'light' || saved === 'dark' ? saved : null;
+  });
+
   useEffect(() => {
     const mq = window.matchMedia('(prefers-color-scheme: dark)');
     const handler = (e: MediaQueryListEvent) => setSystemDark(e.matches);
@@ -30,21 +30,19 @@ export function ThemeProvider({ children }: { children: ReactNode }) {
     return () => mq.removeEventListener('change', handler);
   }, []);
 
-  const resolvedTheme: 'light' | 'dark' =
-    theme === 'system' ? (systemDark ? 'dark' : 'light') : theme;
+  const resolvedTheme: 'light' | 'dark' = explicit ?? (systemDark ? 'dark' : 'light');
 
   useEffect(() => {
-    const root = document.documentElement;
-    root.setAttribute('data-theme', resolvedTheme);
+    document.documentElement.setAttribute('data-theme', resolvedTheme);
   }, [resolvedTheme]);
 
-  const setTheme = (t: Theme) => {
+  const setTheme = (t: StoredTheme) => {
     localStorage.setItem('theme', t);
-    setThemeState(t);
+    setExplicit(t);
   };
 
   return (
-    <ThemeContext.Provider value={{ theme, resolvedTheme, setTheme }}>
+    <ThemeContext.Provider value={{ resolvedTheme, setTheme }}>
       {children}
     </ThemeContext.Provider>
   );