feat: complete Settings TOC with all 14 sections

Added IDs to subsections: Performance, Tag Filtering, Backend Settings,
  Recent History, Webhooks, Public Shares, Hidden Files

TOC order (professional UX):
  1. Search → Performance → Tag Filtering → Backend → Recent History
  2. Sync → Hidden Files → Webhooks → Public Shares
  3. Diagnostics → AI → Themes → Profile → About

+7 new locale keys (1268 total)

frontend/locales/en.json

@@ -168,8 +168,8 @@
   "config.section_watcher": "Auto sync",
   "config.section_profile": "User profile",
   "config.section_ai": "AI API keys",
-  "config.section_hidden": "Hidden files",
-  "config.section_webhooks": "Webhooks",
+  "config.section_hidden": "Hidden Files",
+  "config.section_webhooks": "🪝 Webhooks",
   "config.section_shares": "Public shares",
   "config.section_backups": "Backups",
   "config.section_diag": "Diagnostics",
@@ -1262,5 +1262,92 @@
   "config.hint_d_lai_avant_traitement_des_changements_group_s_0_5": "[EN] Délai avant traitement des changements groupés (0.5-10 secondes)",
   "config.saving": "Saving",
   "config.error_unknown": "Unknown error",
-  "config.error_prefix": "Error"
+  "config.error_prefix": "Error",
+  "config.section_parametres-de-recherche": "Paramètres de recherche",
+  "config.section_historique-recent-redemarrage-non-requis": "📋 Historique récent\n                                    Redémarrage non requis",
+  "config.section_parametres-backend-redemarrage-requis": "Paramètres backend\n                                    Redémarrage requis",
+  "config.section_filtrage-de-tags": "Filtrage de tags",
+  "config.section_synchronisation-automatique": "Synchronisation automatique",
+  "config.section_diagnostics": "Diagnostics",
+  "config.section_cles-api-intelligence-artificielle": "🤖 Cles API Intelligence Artificielle",
+  "config.section_themes": "🎨 Thèmes",
+  "config.section_profil-utilisateur": "👤 Profil utilisateur",
+  "config.section_a-propos": "📦 À propos",
+  "config.section_partages-publics": "📤 Partages publics",
+  "config.section_interface-utilisateur": "🧭 Interface utilisateur",
+  "config.section_en-tete": "En-tête",
+  "config.section_sidebar-barre-laterale": "Sidebar (barre latérale)",
+  "config.section_zone-de-contenu": "Zone de contenu",
+  "config.section_navigation": "Navigation",
+  "config.section_arborescence-des-vaults": "Arborescence des vaults",
+  "config.section_filtrage-de-la-sidebar": "Filtrage de la sidebar",
+  "config.section_breadcrumb-et-repositionnement": "Breadcrumb et repositionnement",
+  "config.section_selection-de-vault": "Sélection de vault",
+  "config.section_gestion-des-onglets": "📑 Gestion des onglets",
+  "config.section_ouverture-d-onglets": "Ouverture d'onglets",
+  "config.section_navigation-entre-onglets": "Navigation entre onglets",
+  "config.section_fonctionnalites": "Fonctionnalités",
+  "config.section_recherche": "🔍 Recherche",
+  "config.section_recherche-simple": "Recherche simple",
+  "config.section_operateurs-avances": "Opérateurs avancés",
+  "config.section_autocompletion": "Autocomplétion",
+  "config.section_chips-de-filtres-actifs": "Chips de filtres actifs",
+  "config.section_facettes-et-tri": "Facettes et tri",
+  "config.section_tags": "🏷️ Tags",
+  "config.section_tag-cloud": "Tag cloud",
+  "config.section_tags-inline-vs-frontmatter": "Tags inline vs frontmatter",
+  "config.section_filtrage-de-tags-template": "Filtrage de tags template",
+  "config.section_fichiers": "📄 Fichiers",
+  "config.section_visualisation": "Visualisation",
+  "config.section_actions-sur-fichiers": "Actions sur fichiers",
+  "config.section_edition-avec-codemirror-6": "Édition avec CodeMirror 6",
+  "config.section_types-de-fichiers-supportes": "Types de fichiers supportés",
+  "config.section_edition-avancee": "✏️ Édition avancée",
+  "config.section_editeur-codemirror-6": "Éditeur CodeMirror 6",
+  "config.section_vue-graphe": "🗺️ Vue Graphe",
+  "config.section_ouverture": "Ouverture",
+  "config.section_interaction": "Interaction",
+  "config.section_affichage": "Affichage",
+  "config.section_performance": "Performance",
+  "config.section_intelligence-artificielle-dans-l-editeur": "🤖 Intelligence Artificielle dans l'Éditeur",
+  "config.section_activation": "Activation",
+  "config.section_barre-d-outils-ai": "Barre d'outils AI",
+  "config.section_indicateurs-visuels": "Indicateurs visuels",
+  "config.section_sauvegarde-automatique": "Sauvegarde automatique",
+  "config.section_providers-supportes": "Providers supportés",
+  "config.section_palette-de-commandes": "⌨️ Palette de commandes",
+  "config.section_mode-fichiers": "Mode fichiers",
+  "config.section_mode-commandes": "Mode commandes",
+  "config.section_raccourcis-clavier": "⌨️ Raccourcis clavier",
+  "config.section_recherche-et-autocompletion": "Recherche et autocomplétion",
+  "config.section_interface": "Interface",
+  "config.section_onglets": "Onglets",
+  "config.section_editeur-codemirror": "Éditeur CodeMirror",
+  "config.section_partage-et-webhooks": "🔗 Partage et Webhooks",
+  "config.section_publication-publique": "Publication publique",
+  "config.section_cas-d-usage": "Cas d'usage",
+  "config.section_evenements-supportes": "Événements supportés",
+  "config.section_format-du-payload": "Format du payload",
+  "config.section_securite-signature-hmac-sha256": "Sécurité : signature HMAC-SHA256",
+  "config.section_configuration": "Configuration",
+  "config.section_exemples-concrets": "Exemples concrets",
+  "config.section_limitations-actuelles": "Limitations actuelles",
+  "config.section_sauvegardes-et-audits": "💾 Sauvegardes et Audits",
+  "config.section_backup-automatique": "Backup automatique",
+  "config.section_audit-log": "Audit log",
+  "config.section_securite": "🛡️ Sécurité",
+  "config.section_authentification": "Authentification",
+  "config.section_protection": "Protection",
+  "config.section_personnalisation": "🎨 Personnalisation",
+  "config.section_theme-clair-sombre": "Thème clair/sombre",
+  "config.section_redimensionnement-de-la-sidebar": "Redimensionnement de la sidebar",
+  "config.section_configuration-avancee": "Configuration avancée",
+  "config.section_astuces-et-bonnes-pratiques": "💡 Astuces et bonnes pratiques",
+  "config.section_workflow-recommande": "Workflow recommandé",
+  "config.section_optimisations": "Optimisations",
+  "config.section_trucs-et-astuces": "Trucs et astuces",
+  "config.section_cas-d-usage-avances": "Cas d'usage avancés",
+  "config.section_construit-avec": "Construit avec",
+  "config.section_backend": "🖥️ Backend Settings",
+  "config.section_recent": "📜 Recent History"
 }