refactor(App): enhance vertical sidebar layout and styling for improved usability and consistency

frontend/src/App.css

@@ -54,6 +54,28 @@
 .navbar-vertical > .container-fluid {
   padding-left: 1rem;
   padding-right: 1rem;
+  display: flex;
+  flex-direction: column;
+  min-height: 100%;
+}
+.navbar-vertical .collapse.navbar-collapse {
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+  min-height: 0;
+}
+.navbar-vertical .collapse .navbar-nav.pt-lg-3 {
+  flex: 1 1 auto;
+  min-height: 0;
+  overflow-y: auto;
+}
+.navbar-vertical .navbar-sidebar-footer {
+  flex-shrink: 0;
+  border-top-color: rgba(255, 255, 255, 0.1) !important;
+}
+.navbar-vertical .navbar-sidebar-footer .nav-link {
+  padding-left: 0.75rem;
+  padding-right: 0.75rem;
 }
 /* Стрелка только у пунктов с подменю (dropdown-toggle), не у обычных ссылок и не у бренда */
 .navbar-vertical .nav-link:not(.dropdown-toggle)::after {

frontend/src/App.jsx

@@ -469,11 +469,71 @@ function MainLayout() {
                 </li>
               ))}
             </ul>
+            {/* Кнопки внизу сайдбара: язык, раскладка, тема, горячие клавиши, настройки */}
+            <div className="navbar-sidebar-footer navbar-nav flex-column border-top pt-2 mt-auto">
+              <div className="nav-item dropdown">
+                <a
+                  href="#"
+                  className="nav-link dropdown-toggle px-3 py-2"
+                  data-bs-toggle="dropdown"
+                  onClick={(e) => e.preventDefault()}
+                  title="Язык"
+                >
+                  <span className="badge">{lang.toUpperCase()}</span>
+                </a>
+                <div className="dropdown-menu dropdown-menu-end">
+                  <a href="#" className={`dropdown-item ${lang === 'ru' ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setLang('ru'); }}>Русский</a>
+                  <a href="#" className={`dropdown-item ${lang === 'en' ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setLang('en'); }}>English</a>
+                </div>
+              </div>
+              <div className="nav-item dropdown">
+                <a
+                  href="#"
+                  className="nav-link dropdown-toggle px-3 py-2"
+                  data-bs-toggle="dropdown"
+                  onClick={(e) => e.preventDefault()}
+                  title={t('layoutSidebar')}
+                >
+                  {layout === LAYOUT_FLUID ? <IconLayoutSidebarLeftExpand size={20} /> : <IconLayoutNavbar size={20} />}
+                </a>
+                <div className="dropdown-menu dropdown-menu-end">
+                  <a href="#" className={`dropdown-item d-flex align-items-center ${layout === LAYOUT_FLUID ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setLayout(LAYOUT_FLUID); }}>
+                    <IconLayoutSidebarLeftExpand className="me-2" size={18} /> {t('layoutSidebar')}
+                  </a>
+                  <a href="#" className={`dropdown-item d-flex align-items-center ${layout === LAYOUT_HORIZONTAL ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setLayout(LAYOUT_HORIZONTAL); }}>
+                    <IconLayoutNavbar className="me-2" size={18} /> {t('layoutHorizontal')}
+                  </a>
+                </div>
+              </div>
+              <div className="nav-item dropdown">
+                <a
+                  href="#"
+                  className="nav-link dropdown-toggle px-3 py-2"
+                  data-bs-toggle="dropdown"
+                  onClick={(e) => e.preventDefault()}
+                  title={t('light') + ' / ' + t('dark')}
+                >
+                  {theme === 'dark' ? '🌙' : '☀️'}
+                </a>
+                <div className="dropdown-menu dropdown-menu-end">
+                  <a href="#" className={`dropdown-item ${theme === 'light' ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setTheme('light'); }}>☀️ {t('light')}</a>
+                  <a href="#" className={`dropdown-item ${theme === 'dark' ? 'active' : ''}`} onClick={(e) => { e.preventDefault(); setTheme('dark'); }}>🌙 {t('dark')}</a>
+                </div>
+              </div>
+              <div className="nav-item">
+                <KeyboardShortcutsButton className="nav-link px-3 py-2" title="Горячие клавиши" />
+              </div>
+              <div className="nav-item">
+                <a href="#" className="nav-link px-3 py-2" onClick={(e) => { e.preventDefault(); setSettingsOpen(true); }} title="Настройки">
+                  <IconSettings size={20} />
+                </a>
+              </div>
+            </div>
           </div>
         </div>
       </header>
 
-      {/* Верхний навбар (как в Tabler fluid vertical) */}
+      {/* Верхний навбар (только тогглер меню на мобильных; кнопки — внизу сайдбара) */}
       <header className="navbar navbar-expand-md d-print-none">
         <div className="container-fluid">
           <button
@@ -486,101 +546,6 @@ function MainLayout() {
           >
             <IconMenu2 />
           </button>
-          <div className="navbar-nav flex-row order-md-last flex-grow-1 justify-content-end">
-            <div className="nav-item dropdown">
-              <a
-                href="#"
-                className="nav-link px-2 dropdown-toggle"
-                data-bs-toggle="dropdown"
-                onClick={(e) => e.preventDefault()}
-              >
-                <span className="badge">{lang.toUpperCase()}</span>
-              </a>
-              <div className="dropdown-menu dropdown-menu-end">
-                <a
-                  href="#"
-                  className={`dropdown-item ${lang === 'ru' ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setLang('ru'); }}
-                >
-                  Русский
-                </a>
-                <a
-                  href="#"
-                  className={`dropdown-item ${lang === 'en' ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setLang('en'); }}
-                >
-                  English
-                </a>
-              </div>
-            </div>
-            <div className="nav-item dropdown">
-              <a
-                href="#"
-                className="nav-link px-2 dropdown-toggle"
-                data-bs-toggle="dropdown"
-                onClick={(e) => e.preventDefault()}
-              >
-                {layout === LAYOUT_FLUID ? <IconLayoutSidebarLeftExpand size={20} /> : <IconLayoutNavbar size={20} />}
-              </a>
-              <div className="dropdown-menu dropdown-menu-end">
-                <a
-                  href="#"
-                  className={`dropdown-item d-flex align-items-center ${layout === LAYOUT_FLUID ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setLayout(LAYOUT_FLUID); }}
-                >
-                  <IconLayoutSidebarLeftExpand className="me-2" size={18} />
-                  {t('layoutSidebar')}
-                </a>
-                <a
-                  href="#"
-                  className={`dropdown-item d-flex align-items-center ${layout === LAYOUT_HORIZONTAL ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setLayout(LAYOUT_HORIZONTAL); }}
-                >
-                  <IconLayoutNavbar className="me-2" size={18} />
-                  {t('layoutHorizontal')}
-                </a>
-              </div>
-            </div>
-            <div className="nav-item dropdown">
-              <a
-                href="#"
-                className="nav-link px-2 dropdown-toggle"
-                data-bs-toggle="dropdown"
-                onClick={(e) => e.preventDefault()}
-              >
-                {theme === 'dark' ? '🌙' : '☀️'}
-              </a>
-              <div className="dropdown-menu dropdown-menu-end">
-                <a
-                  href="#"
-                  className={`dropdown-item ${theme === 'light' ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setTheme('light'); }}
-                >
-                  ☀️ {t('light')}
-                </a>
-                <a
-                  href="#"
-                  className={`dropdown-item ${theme === 'dark' ? 'active' : ''}`}
-                  onClick={(e) => { e.preventDefault(); setTheme('dark'); }}
-                >
-                  🌙 {t('dark')}
-                </a>
-              </div>
-            </div>
-            <div className="nav-item">
-              <KeyboardShortcutsButton className="nav-link px-2" />
-            </div>
-            <div className="nav-item">
-              <a
-                href="#"
-                className="nav-link px-2"
-                onClick={(e) => { e.preventDefault(); setSettingsOpen(true); }}
-                title="Настройки"
-              >
-                <IconSettings size={20} />
-              </a>
-            </div>
-          </div>
         </div>
       </header>