feat: Phase 7 - Frontend scaffolding and auth (T-023, T-024, T-025)

T-023: Initialize React project
- Vite + React 19 + TypeScript scaffold
- Tailwind CSS v4 with @tailwindcss/vite plugin
- Dependencies: react-router-dom, axios, @tanstack/react-query, lucide-react
- Project structure: api/, components/, pages/, context/, types/, hooks/, lib/

T-024: API client and auth context
- Axios client with JWT interceptor (auto-attach token, clear on 401)
- login() and getMe() API functions
- AuthContext: user state, login, logout, isAuthenticated, isLoading
- Token persistence via localStorage with hydration on mount
- TypeScript types for all backend models

T-025: Login page and layout
- LoginPage with form, error handling, redirect on success
- Layout with sidebar + header + Outlet
- Sidebar with role-aware navigation (System only for admin)
- ProtectedRoute wrapper with role-based access control
- Routes: /login, /dashboard, /techniques, /tests, /system

frontend/src/types/models.ts

@@ -0,0 +1,91 @@
+/* ── Shared TypeScript types matching the backend Pydantic schemas ── */
+
+export interface User {
+  id: string;
+  username: string;
+  role: string;
+}
+
+export interface Technique {
+  id: string;
+  mitre_id: string;
+  name: string;
+  description: string | null;
+  tactic: string | null;
+  platforms: string[];
+  mitre_version: string | null;
+  mitre_last_modified: string | null;
+  is_subtechnique: boolean;
+  parent_mitre_id: string | null;
+  status_global: TechniqueStatus;
+  review_required: boolean;
+  last_review_date: string | null;
+}
+
+export type TechniqueStatus =
+  | "not_evaluated"
+  | "in_progress"
+  | "validated"
+  | "partial"
+  | "not_covered"
+  | "review_required";
+
+export interface Test {
+  id: string;
+  technique_id: string;
+  name: string;
+  description: string | null;
+  platform: string | null;
+  procedure_text: string | null;
+  tool_used: string | null;
+  execution_date: string | null;
+  created_by: string | null;
+  result: TestResult | null;
+  state: TestState;
+  validated_by: string | null;
+  validated_at: string | null;
+  created_at: string;
+}
+
+export type TestState = "draft" | "in_review" | "validated" | "rejected";
+export type TestResult = "detected" | "not_detected" | "partially_detected";
+
+export interface Evidence {
+  id: string;
+  test_id: string;
+  file_name: string;
+  file_path: string;
+  sha256_hash: string;
+  uploaded_by: string | null;
+  uploaded_at: string;
+}
+
+export interface IntelItem {
+  id: string;
+  technique_id: string | null;
+  url: string;
+  title: string | null;
+  source: string | null;
+  detected_at: string;
+  reviewed: boolean;
+}
+
+export interface CoverageSummary {
+  total_techniques: number;
+  validated: number;
+  partial: number;
+  not_covered: number;
+  in_progress: number;
+  not_evaluated: number;
+  coverage_percentage: number;
+}
+
+export interface TacticCoverage {
+  tactic: string;
+  total: number;
+  validated: number;
+  partial: number;
+  not_covered: number;
+  not_evaluated: number;
+  in_progress: number;
+}