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/app/dashboard/DashboardHeader.tsx

@@ -31,7 +31,7 @@ export function DashboardHeader() {
       <header className="flex h-20 shrink-0 items-center justify-between border-b border-black/5 dark:border-white/5 bg-white/50 dark:bg-[#141414]/50 backdrop-blur-md px-6 lg:px-8">
         {/* Mobile menu button */}
         <button
-          className="lg:hidden p-2 text-brand-dark/40 dark:text-white/40 hover:text-brand-dark dark:hover:text-white transition-colors"
+          className="lg:hidden p-2 text-brand-dark/65 dark:text-white/65 hover:text-brand-dark dark:hover:text-white transition-colors"
           onClick={() => setMobileOpen(!mobileOpen)}
           aria-label={t('dashboard.header.toggleMenu')}
         >
@@ -47,11 +47,7 @@ export function DashboardHeader() {
         </div>
 
         {/* Left side - desktop */}
-        <div className="hidden lg:flex items-center gap-3">
-          <span className="text-[10px] font-bold uppercase tracking-[0.4em] text-brand-dark/30 dark:text-white/30">
-            {t('dashboard.topbar.interfaceLabel')}
-          </span>
-        </div>
+        <div className="hidden lg:flex items-center gap-3" />
 
         {/* Right side */}
         <div className="flex items-center gap-3">
@@ -69,7 +65,7 @@ export function DashboardHeader() {
                 <span className="text-[11px] font-black uppercase tracking-tight text-brand-dark dark:text-white">
                   {user.name}
                 </span>
-                <span className="text-[9px] font-black uppercase tracking-widest text-brand-accent">
+                <span className="text-[10px] font-black uppercase tracking-wider text-brand-accent">
                   {user.tier && user.tier !== 'free'
                     ? t('dashboard.topbar.premiumAccess', { defaultValue: 'Premium Access' })
                     : translateTier(t, user.tier)}
@@ -112,7 +108,7 @@ export function DashboardHeader() {
                     'flex items-center gap-4 rounded-2xl px-6 py-4 text-[11px] font-black uppercase tracking-[0.2em] transition-all duration-200',
                     isActive
                       ? 'bg-brand-dark text-white shadow-xl'
-                      : 'text-brand-dark/40 dark:text-white/40 hover:bg-brand-muted dark:hover:bg-[#1f1f1f]'
+                      : 'text-brand-dark/65 dark:text-white/65 hover:bg-brand-muted dark:hover:bg-[#1f1f1f]'
                   )}
                 >
                   <item.icon size={18} className="shrink-0" />
@@ -132,7 +128,7 @@ export function DashboardHeader() {
                   <span className="text-[11px] font-black uppercase tracking-tight text-brand-dark dark:text-white">
                     {user.name}
                   </span>
-                  <span className="px-1.5 py-0 rounded-full border border-brand-accent/30 text-brand-accent text-[7px] font-black uppercase w-fit">
+                  <span className="px-1.5 py-0 rounded-full border border-brand-accent/30 text-brand-accent text-[10px] font-black uppercase w-fit">
                     {translateTier(t, user.tier)}
                   </span>
                 </div>
@@ -141,7 +137,7 @@ export function DashboardHeader() {
 
             <button
               onClick={logout}
-              className="flex items-center gap-3 rounded-2xl px-6 py-4 text-[11px] font-black uppercase tracking-[0.2em] text-brand-dark/40 dark:text-white/40 hover:text-red-500 transition-colors"
+              className="flex items-center gap-3 rounded-2xl px-6 py-4 text-[11px] font-black uppercase tracking-[0.2em] text-brand-dark/65 dark:text-white/65 hover:text-red-500 transition-colors"
             >
               <LogOut size={18} className="shrink-0" />
               {t('dashboard.sidebar.signOut')}