feat: publication IA (magazine/brief/essay) + fixes critique

Publication IA:
- 4 templates (magazine, brief, essay, simple) avec CSS riche
- Rewrite IA (article/exercises/tutorial/reference/mixed)
- Modération avec timeout 12s + fallback safe
- Quotas publish_enhance par tier (basic=2, pro=15, business=100)
- Détection contenu stale (hash)
- Migration DB publishedContent/publishedTemplate/publishedSourceHash

Fixes:
- cheerio v1.2: Element -> AnyNode (domhandler), decodeEntities cast
- _isShared ajouté au type Note (champ virtuel serveur)
- callout colors PDF export: extraction fonction pure testable
- admin/published: guard note.userId null
- Cmd+S fonctionne en mode dialog (pas seulement fullPage)

i18n:
- 23 clés publish* traduites dans les 15 locales
- Extension Web Clipper: 13 locales mise à jour

Tests:
- callout-colors.test.ts (6 tests)
- note-visible-in-view.test.ts (5 tests)
- entitlements.test.ts + byok-entitlements.test.ts: mock usageLog + unstubAllEnvs
- 199/199 tests passent

Tracker: user-stories.md sync avec sprint-status.yaml

memento-note/components/usage-meter.tsx

@@ -32,8 +32,8 @@ export function UsageMeter({ className }: UsageMeterProps) {
       const json = await res.json();
       return { quotas: json.quotas as Record<string, QuotaData>, tier: json.tier as string };
     },
-    staleTime: 5000,
-    refetchInterval: 10000,
+    staleTime: 0,
+    refetchInterval: 5000,
   });
 
   useEffect(() => {
@@ -71,6 +71,7 @@ export function UsageMeter({ className }: UsageMeterProps) {
     'chat',
     'brainstorm_create', // Sera affiché comme "Sessions brainstorm"
     'suggest_charts',
+    'publish_enhance',
   ]);
 
   const featureLabels: Record<string, string> = {
@@ -81,6 +82,7 @@ export function UsageMeter({ className }: UsageMeterProps) {
     chat: t('usageMeter.featureChat'),
     brainstorm_create: t('usageMeter.featureBrainstormSessions'), // Label simplifié
     suggest_charts: t('usageMeter.featureCharts'),
+    publish_enhance: t('usageMeter.featurePublishEnhance'),
   };
 
   const featureQuotas = Object.entries(data.quotas)