fix(ui): wave 2 from critique re-run — AA contrast, unified PageHeader, checkout confirm

Nav: teams/settings/services back out of the nav until product-ready (user
decision); teams page was already half-finished (UUID member display is a
backend limitation).

Payment: explicit confirmation dialog (plan, amount, billing period, Stripe
note) before any redirect; ?plan= URL now pre-opens the dialog instead of
triggering a silent checkout.

Contrast AA sweep (71 replacements): functional micro-labels raised to
>=60-65% opacity and >=10px across sidebar, header, pricing, landing;
decorative all-caps 'interface' label removed.

Design unification: new PageHeader component (accent pill + serif
base/accent title) applied to settings, services, reviews, teams; pricing
header returned to the editorial voice (serif + accent pill); dead
GlossaryCard deleted.

i18n residuals: suggestion chips, 'Standard' provider label, notification
close, model-combobox strings extracted (+broken bg-surface/border-border-
subtle tokens fixed); ~45 new keys EN+FR; 13 dead keys removed; zero
missing keys verified.

Reviews: icon-only row actions now carry visible text; 'Approve all' is
two-step armed-confirm.

Accelerators: Ctrl/Cmd+Enter submits; arrow-key navigation in the language
combobox; recent-jobs history cap 8->20 with per-job download; source=target
config rejected; empty 'Master Quality' badge removed.

Cookie consent: reopenable via footer link, emoji replaced with drawn icon.

Verified: build exit 0, vitest 9/9, eslint 64 errors = previous level,
0 missing i18n keys.

frontend/src/components/ui/notification.tsx

@@ -4,6 +4,7 @@ import * as React from "react"
 import { cva, type VariantProps } from "class-variance-authority"
 import { X, CheckCircle, AlertCircle, AlertTriangle, Info, Loader2 } from "lucide-react"
 import { cn } from "@/lib/utils"
+import { useI18n } from "@/lib/i18n"
 
 const notificationVariants = cva(
   "group pointer-events-auto relative flex w-full items-center justify-between space-x-4 overflow-hidden rounded-lg border p-4 pe-8 shadow-lg transition-all duration-300 ease-out",
@@ -74,6 +75,7 @@ const Notification = React.forwardRef<HTMLDivElement, NotificationProps>(
     children,
     ...props 
   }, ref) => {
+    const { t } = useI18n()
     const [visible, setVisible] = React.useState(true)
     const [progress, setProgress] = React.useState(100)
 
@@ -181,7 +183,7 @@ const Notification = React.forwardRef<HTMLDivElement, NotificationProps>(
             type="button"
             onClick={handleClose}
             className="absolute right-2 top-2 flex-shrink-0 rounded-md p-1 text-foreground/50 opacity-0 transition-opacity hover:opacity-100 focus-visible:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2"
-            aria-label="Close notification"
+            aria-label={t("common.closeNotification")}
           >
             <X className="h-4 w-4" />
           </button>