feat: layout responsive mobile (bottom nav) / laptop (sidebar) + page d'accueil

frontend/src/components/layout/BottomNav.tsx

@@ -0,0 +1,45 @@
+import { NavLink } from 'react-router-dom'
+
+const NAV_ITEMS = [
+  { to: '/',         icon: 'house',          label: 'Accueil' },
+  { to: '/todos',    icon: 'list-check',     label: 'Todos' },
+  { to: '/shopping', icon: 'cart-shopping',  label: 'Courses' },
+  { to: '/notes',    icon: 'note-sticky',    label: 'Notes' },
+]
+
+export default function BottomNav() {
+  return (
+    <nav style={{
+      display: 'flex',
+      background: 'var(--bg-2)',
+      borderTop: '1px solid var(--border-2)',
+      paddingBottom: 'env(safe-area-inset-bottom)',
+    }}>
+      {NAV_ITEMS.map((item) => (
+        <NavLink
+          key={item.to}
+          to={item.to}
+          end={item.to === '/'}
+          style={({ isActive }) => ({
+            flex: 1,
+            display: 'flex',
+            flexDirection: 'column',
+            alignItems: 'center',
+            justifyContent: 'center',
+            minHeight: 56,
+            gap: 4,
+            color: isActive ? 'var(--accent)' : 'var(--ink-3)',
+            textDecoration: 'none',
+            fontSize: 10,
+            fontFamily: 'var(--font-ui)',
+            letterSpacing: '0.05em',
+            textTransform: 'uppercase',
+          })}
+        >
+          <i className={`fa-solid fa-${item.icon}`} style={{ fontSize: 20 }} />
+          {item.label}
+        </NavLink>
+      ))}
+    </nav>
+  )
+}

frontend/src/components/layout/Layout.tsx

@@ -1,4 +1,24 @@
 import { Outlet } from 'react-router-dom'
+import BottomNav from './BottomNav'
+import SideNav from './SideNav'
+
 export default function Layout() {
-  return <div><Outlet /></div>
+  return (
+    <div style={{ display: 'flex', height: '100dvh', background: 'var(--bg-1)' }}>
+      {/* Sidebar — visible uniquement sur laptop (lg et +) */}
+      <div className="hidden lg:flex" style={{ flexShrink: 0 }}>
+        <SideNav />
+      </div>
+
+      {/* Contenu principal */}
+      <main style={{ flex: 1, overflow: 'auto', paddingBottom: 0 }} className="lg:pb-0 pb-14">
+        <Outlet />
+      </main>
+
+      {/* Navigation bas — visible uniquement sur mobile */}
+      <div className="lg:hidden" style={{ position: 'fixed', bottom: 0, left: 0, right: 0, zIndex: 50 }}>
+        <BottomNav />
+      </div>
+    </div>
+  )
 }

frontend/src/components/layout/SideNav.tsx

@@ -0,0 +1,51 @@
+import { NavLink } from 'react-router-dom'
+
+const NAV_ITEMS = [
+  { to: '/',         icon: 'house',          label: 'Accueil' },
+  { to: '/todos',    icon: 'list-check',     label: 'Todos' },
+  { to: '/shopping', icon: 'cart-shopping',  label: 'Courses' },
+  { to: '/notes',    icon: 'note-sticky',    label: 'Notes' },
+]
+
+export default function SideNav() {
+  return (
+    <nav style={{
+      width: 220,
+      background: 'var(--bg-2)',
+      borderRight: '1px solid var(--border-1)',
+      display: 'flex',
+      flexDirection: 'column',
+      padding: '16px 0',
+      height: '100%',
+    }}>
+      <div style={{ padding: '0 16px 16px', borderBottom: '1px solid var(--border-1)', marginBottom: 8 }}>
+        <span style={{ color: 'var(--accent)', fontFamily: 'var(--font-mono)', fontWeight: 700, fontSize: 16 }}>
+          HomeHub
+        </span>
+      </div>
+      {NAV_ITEMS.map((item) => (
+        <NavLink
+          key={item.to}
+          to={item.to}
+          end={item.to === '/'}
+          style={({ isActive }) => ({
+            display: 'flex',
+            alignItems: 'center',
+            gap: 12,
+            padding: '10px 16px',
+            color: isActive ? 'var(--accent)' : 'var(--ink-2)',
+            background: isActive ? 'var(--accent-tint)' : 'transparent',
+            borderLeft: isActive ? '2px solid var(--accent)' : '2px solid transparent',
+            textDecoration: 'none',
+            fontFamily: 'var(--font-ui)',
+            fontSize: 14,
+            minHeight: 40,
+          })}
+        >
+          <i className={`fa-solid fa-${item.icon}`} style={{ width: 18 }} />
+          {item.label}
+        </NavLink>
+      ))}
+    </nav>
+  )
+}

frontend/src/pages/HomePage.tsx

@@ -1,3 +1,30 @@
 export default function HomePage() {
-  return <div>HomeHub</div>
+  return (
+    <div className="p-4">
+      <div className="glass" style={{ padding: 20, borderRadius: 10, marginBottom: 16 }}>
+        <h1 style={{ color: 'var(--accent)', fontFamily: 'var(--font-mono)', margin: 0 }}>
+          HomeHub
+        </h1>
+        <p style={{ color: 'var(--ink-2)', marginTop: 8 }}>
+          Application d&apos;organisation personnelle
+        </p>
+      </div>
+      <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(140px, 1fr))', gap: 12 }}>
+        {[
+          { label: 'Todos', icon: 'list', path: '/todos' },
+          { label: 'Courses', icon: 'cart-shopping', path: '/shopping' },
+          { label: 'Notes', icon: 'note-sticky', path: '/notes' },
+        ].map((item) => (
+          <div
+            key={item.path}
+            className="glass interactive"
+            style={{ padding: 20, borderRadius: 10, textAlign: 'center', cursor: 'pointer', minHeight: 80, display: 'flex', flexDirection: 'column', alignItems: 'center', justifyContent: 'center', gap: 8 }}
+          >
+            <i className={`fa-solid fa-${item.icon}`} style={{ fontSize: 24, color: 'var(--accent)' }} />
+            <span style={{ color: 'var(--ink-1)', fontFamily: 'var(--font-ui)', fontSize: 14 }}>{item.label}</span>
+          </div>
+        ))}
+      </div>
+    </div>
+  )
 }