[CLAUDE] FE-User: redesign density-first theo UI/UX guide AI_INFRA — giữ brand SOLUTION (S58)

Anh yêu cầu sau /check-email ai_infra (guide canonical 13 mục "Surgical
Precision Minimalism", anh-approved 06-11): chỉnh giao diện eoffice giống
guide, GIỮ nhận dạng thương hiệu SOLUTION.

14 file fe-user, visual-only (mirror design system fe-admin S55 + đối chiếu
guide; fe-admin/BE untouched):
- index.css: heading ladder semibold (bỏ font-bold) + .label-eyebrow uppercase
  + tnum note. 6 ui primitives (Button/Input/Label/Select/Textarea/Dialog):
  text-xs font-semibold, control h28-40, rounded-lg, focus ring brand-500,
  bỏ shadow trang trí — variant/size keys + props/forwardRef STABLE.
- 6 shell: DataTable (thead sticky + density px-3 py-2 + tnum + RowActions/
  RowActionButton ADDITIVE luôn-hiện không opacity-hover) / Layout (active
  leaf brand left-rail, logic nav/permission nguyên) / TopBar / PageHeader /
  PhaseBadge (ring-current/15) / EmptyState. + LoginPage polish nhẹ.
- BRAND GIỮ: #1F7DC1 (brand-*) + Be Vietnam Pro + neutral slate (guide cho
  plug hue riêng — chia sẻ grammar, không chia sẻ vocabulary-màu).

Verify: npm build ×2 PASS 0 TS err (fe-user 443ms + fe-admin 8.9s untouched-
confirm). Diff-review từng file: functionality keys stable, additive-only.
frontend-designer return-truncated gotcha #53 giữa FD2 screenshot → em main
disk-recover + self-gate (precedent S55); visual live-check sau deploy.

Email AI_INFRA 2026-06-11-ui-ux-design-guide: inbox copy verified hash ✓✓
(whole-file + body), processed sau commit này.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

fe-user/src/index.css

@@ -40,13 +40,26 @@ body {
   text-rendering: optimizeLegibility;
 }
 
+/* Heading tightening + better hierarchy with Be Vietnam Pro.
+   Density-first (NAMGROUP convention): semibold ladder, never font-bold —
+   weight carries hierarchy without shouting. */
 h1, h2, h3, h4 {
-  letter-spacing: -0.018em;
+  letter-spacing: -0.014em;
   color: #0f172a;
+  font-weight: 600;
 }
-h1 { font-weight: 700; }
-h2 { font-weight: 600; }
 
+/* Section / form labels — uppercase scan-pattern shared across the app.
+   Use class="label-eyebrow" for the dense ERP label treatment. */
+.label-eyebrow {
+  font-size: 11px;
+  font-weight: 600;
+  letter-spacing: 0.06em;
+  text-transform: uppercase;
+  color: #64748b; /* slate-500 — WCAG-AA on white (4.6:1) */
+}
+
+/* Tabular numbers in tables + stat cards for better alignment */
 table, .tabular-nums {
   font-variant-numeric: tabular-nums;
 }