feat: add contact link to settings, update lake labels and sidebar icons, and enhance KPI flow visualization

src/components/Sidebar.tsx

@@ -1,6 +1,6 @@
 import { useState } from 'react';
 import { useNavigate, useLocation } from 'react-router-dom';
-import { FiDroplet, FiStar, FiMap, FiSettings, FiMenu, FiChevronLeft, FiChevronRight } from 'react-icons/fi';
+import { FiDroplet, FiStar, FiMap, FiSettings, FiChevronLeft, FiChevronRight, FiDatabase } from 'react-icons/fi';
 import { type Language, t } from '../translations';
 
 interface Props {
@@ -54,7 +54,7 @@ const Sidebar = ({ language, onOpenSettings, isMobileMenuOpen, onCloseMobileMenu
           <span className="sidebar-text">{dict.favorites}</span>
         </div>
         <div className={`nav-item ${isOverview ? 'active' : ''}`} onClick={() => handleNavigate('/')}>
-          <FiMenu />
+          <FiDatabase />
           <span className="sidebar-text">{dict.lakes}</span>
         </div>
         <div className={`nav-item ${isMap ? 'active' : ''}`} onClick={() => handleNavigate('/map')}>