feat: sélecteur de langue dans settings.php — persisté par compte en BDD

- Sélecteur FR/EN/CA déplacé du header vers settings.php
- Colonne lang ajoutée à users (meta DB) — langue sauvegardée par compte
- Login charge automatiquement la langue préférée de l'utilisateur
- Header nettoyé du sélecteur de langue

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

docker/init/00-setup.sql

@@ -20,6 +20,7 @@ CREATE TABLE IF NOT EXISTS users (
   family_id     INT DEFAULT NULL,
   is_admin      TINYINT(1) DEFAULT 0,
   is_active     TINYINT(1) DEFAULT 1,
+  lang          VARCHAR(5) DEFAULT 'fr',
   created_at    DATETIME DEFAULT CURRENT_TIMESTAMP,
   FOREIGN KEY (family_id) REFERENCES families(id)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

header.php

@@ -54,13 +54,6 @@ $currentLang = $_SESSION['app_lang'] ?? 'fr';
 
     <div class="pf-header-right">
       
-      <div style="display: flex; align-items: center; gap: 8px;">
-          <a href="<?= getLangUrl('fr') ?>" style="text-decoration:none; font-weight:bold; font-size:1rem; color: <?= $currentLang === 'fr' ? '#2563eb' : '#94a3b8' ?>;" title="Français">FR</a>
-          <span style="color: #cbd5e1;">|</span>
-          <a href="<?= getLangUrl('ca') ?>" style="text-decoration:none; font-weight:bold; font-size:1rem; color: <?= $currentLang === 'ca' ? '#f59e0b' : '#94a3b8' ?>;" title="Català">CA</a>
-          <span style="color: #cbd5e1;">|</span>
-          <a href="<?= getLangUrl('en') ?>" style="text-decoration:none; font-weight:bold; font-size:1rem; color: <?= $currentLang === 'en' ? '#16a34a' : '#94a3b8' ?>;" title="English">EN</a>
-      </div>
 
       <?php if (isset($_SESSION['user'])): ?>
         <div class="pf-desktop-actions" style="display: flex; align-items: center; gap: 10px; border-left: 1px solid #cbd5e1; padding-left: 15px;">

login.php

@@ -21,7 +21,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $error = tr('error_missing_fields');
     } else {
         $stmt = $meta_pdo->prepare("
-            SELECT u.id, u.username, u.password_hash, u.display_name, u.family_id, u.is_admin, u.is_active, f.db_name, f.is_active as family_active
+            SELECT u.id, u.username, u.password_hash, u.display_name, u.family_id, u.is_admin, u.is_active, u.lang, f.db_name, f.is_active as family_active
             FROM users u
             LEFT JOIN families f ON f.id = u.family_id
             WHERE u.username = ?
@@ -43,6 +43,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                     'is_admin'     => (bool)$user['is_admin'],
                 ];
                 $_SESSION['family_db'] = $user['db_name'];
+                $_SESSION['app_lang']  = $user['lang'] ?? 'fr';
                 $redirectTo = $_GET['redirect'] ?? '/index.php';
                 header('Location: ' . $redirectTo);
                 exit;

settings.php

@@ -14,6 +14,16 @@ $success = null;
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $action = $_POST['action'] ?? '';
 
+    if ($action === 'set_lang') {
+        $lang = $_POST['lang'] ?? 'fr';
+        if (in_array($lang, ['fr', 'ca', 'en'])) {
+            $_SESSION['app_lang'] = $lang;
+            $meta_pdo->prepare("UPDATE users SET lang = ? WHERE id = ?")
+                     ->execute([$lang, $user_id]);
+            $success = "Language updated.";
+        }
+    }
+
     if ($action === 'update_profile') {
         $display_name = trim($_POST['display_name'] ?? '');
         if (!$display_name) {
@@ -98,6 +108,25 @@ require __DIR__ . '/header.php';
     <div style="background:#fee2e2;border:1px solid #fca5a5;border-radius:8px;padding:12px 16px;margin-bottom:24px;color:#991b1b">✗ <?= htmlspecialchars($error) ?></div>
   <?php endif; ?>
 
+  <!-- ── Langue ─────────────────────────────────────────────────────────── -->
+  <section style="background:white;border:1px solid #e2e8f0;border-radius:12px;padding:24px;margin-bottom:24px">
+    <h2 style="font-size:1rem;font-weight:700;margin-bottom:20px">🌐 Langue / Language</h2>
+    <form method="post" style="display:flex;gap:10px;flex-wrap:wrap">
+      <input type="hidden" name="action" value="set_lang">
+      <?php
+        $langs = ['fr' => '🇫🇷 Français', 'en' => '🇬🇧 English', 'ca' => '🏴 Català'];
+        $currentLang = $_SESSION['app_lang'] ?? 'fr';
+        foreach ($langs as $code => $label):
+      ?>
+      <button type="submit" name="lang" value="<?= $code ?>"
+        class="pf-btn <?= $currentLang === $code ? '' : 'btn-secondary' ?>"
+        style="<?= $currentLang === $code ? 'pointer-events:none' : '' ?>">
+        <?= $label ?>
+      </button>
+      <?php endforeach; ?>
+    </form>
+  </section>
+
   <!-- ── Profil ──────────────────────────────────────────────────────────── -->
   <section style="background:white;border:1px solid #e2e8f0;border-radius:12px;padding:24px;margin-bottom:24px">
     <h2 style="font-size:1rem;font-weight:700;margin-bottom:20px">👤 Mon profil</h2>