fix(audit): nettoyage accès, garde-fous build, unification quotas

Semaine 1 — fuites et accès :
- /archive rendu accessible via sidebar (était invisible)
- Suppression pages orphelines : /chat, /graph, /support, test-title-suggestions
- Fixes i18n : search-modal (clé non interpolée), sidebar tooltips, export PDF
- 15 locales mises à jour

Semaine 2 — garde-fous :
- 8 erreurs TS fixees → ignoreBuildErrors: false (build type-safe)
- reactStrictMode: true (dev-only, zero impact prod)
- reserveUsageOrThrow → wrapper deprecie vers reserveAiUsageOrThrow
- auth-guard.ts : requireAuthOrResponse() + requireAdminOrResponse()

Tests 212/212 | Lint 0 erreur | Build OK | tsc 0 erreur

memento-note/components/note-editor/note-editor-toolbar.tsx

@@ -165,11 +165,11 @@ export function NoteEditorToolbar({ mode, onClose, onToggleAttachments, attachme
 
       // Remove all action buttons, toolbars, and UI elements
       clone.querySelectorAll('button, .drag-handle, [contenteditable="false"], .opacity-0, .group-hover\\:opacity-100').forEach(el => el.remove())
+      // Remove remaining UI controls (block action icons with tooltips) regardless of
+      // UI language — keep user content that may carry a title (links, abbreviations).
       clone.querySelectorAll('[title]').forEach(el => {
-        const title = el.getAttribute('title')
-        if (title && (title.includes('Supprimer') || title.includes('Delete') || title.includes('Désactiver') || title.includes('Disable') || title.includes('Modifier') || title.includes('Edit'))) {
-          el.remove()
-        }
+        const tag = el.tagName.toLowerCase()
+        if (tag !== 'a' && tag !== 'abbr') el.remove()
       })
 
       // Render KaTeX equations properly