feat: implement platform management system with authentication and dashboard

- Add PlatformUser model with roles (SUPER_ADMIN, ADMIN, SUPPORT)
- Implement platform authentication with NextAuth
- Create platform dashboard showing companies, users, and sessions
- Add platform API endpoints for company management
- Update landing page with SaaS design
- Include test improvements and accessibility updates

tests/unit/accessibility.test.tsx

@@ -56,7 +56,7 @@ describe("Accessibility Tests", () => {
       );
 
       await screen.findByText("User Management");
-      
+
       // Basic accessibility check - most critical violations would be caught here
       const results = await axe(container);
       expect(results.violations.length).toBeLessThan(5); // Allow minor violations
@@ -189,11 +189,11 @@ describe("Accessibility Tests", () => {
 
       const emailInput = screen.getByLabelText("Email");
       const submitButton = screen.getByRole("button", { name: /invite user/i });
-      
+
       // Elements should be focusable
       emailInput.focus();
       expect(emailInput).toHaveFocus();
-      
+
       submitButton.focus();
       expect(submitButton).toHaveFocus();
     });

tests/unit/format-enums.test.ts

@@ -99,7 +99,7 @@ describe("Format Enums Utility", () => {
     it("should be an alias for formatEnumValue", () => {
       const testValues = [
         "SALARY_COMPENSATION",
-        "SCHEDULE_HOURS", 
+        "SCHEDULE_HOURS",
         "UNKNOWN_ENUM",
         null,
         undefined,
@@ -129,7 +129,7 @@ describe("Format Enums Utility", () => {
     it("should handle very long enum values", () => {
       const longEnum = "A".repeat(100) + "_" + "B".repeat(100);
       const result = formatEnumValue(longEnum);
-      
+
       expect(result).toBeTruthy();
       expect(result?.length).toBeGreaterThan(200);
       expect(result?.includes(" ")).toBeTruthy();
@@ -150,16 +150,16 @@ describe("Format Enums Utility", () => {
     it("should be performant with many calls", () => {
       const testEnum = "SALARY_COMPENSATION";
       const iterations = 1000;
-      
+
       const startTime = performance.now();
-      
+
       for (let i = 0; i < iterations; i++) {
         formatEnumValue(testEnum);
       }
-      
+
       const endTime = performance.now();
       const duration = endTime - startTime;
-      
+
       // Should complete 1000 calls in reasonable time (less than 100ms)
       expect(duration).toBeLessThan(100);
     });
@@ -208,7 +208,7 @@ describe("Format Enums Utility", () => {
     it("should provide readable text for badges and labels", () => {
       const badgeValues = [
         "ADMIN",
-        "USER", 
+        "USER",
         "AUDITOR",
         "UNRECOGNIZED_OTHER",
       ];
@@ -249,7 +249,7 @@ describe("Format Enums Utility", () => {
       // Future enum values should still be formatted reasonably
       const futureEnums = [
         "REMOTE_WORK_POLICY",
-        "SUSTAINABILITY_INITIATIVES", 
+        "SUSTAINABILITY_INITIATIVES",
         "DIVERSITY_INCLUSION",
         "MENTAL_HEALTH_SUPPORT",
       ];

tests/unit/keyboard-navigation.test.tsx

@@ -52,7 +52,7 @@ describe("Keyboard Navigation Tests", () => {
 
       roleSelect.focus();
       expect(roleSelect).toBeInTheDocument();
-      
+
       submitButton.focus();
       expect(document.activeElement).toBe(submitButton);
     });
@@ -84,7 +84,7 @@ describe("Keyboard Navigation Tests", () => {
 
       // Submit with Enter key
       fireEvent.keyDown(submitButton, { key: "Enter" });
-      
+
       // Form should be submitted (fetch called for initial load + submission)
       expect(global.fetch).toHaveBeenCalledTimes(2);
     });
@@ -117,7 +117,7 @@ describe("Keyboard Navigation Tests", () => {
       // Activate with Space key
       submitButton.focus();
       fireEvent.keyDown(submitButton, { key: " " });
-      
+
       // Should trigger form submission (fetch called for initial load + submission)
       expect(global.fetch).toHaveBeenCalledTimes(3);
     });
@@ -153,7 +153,7 @@ describe("Keyboard Navigation Tests", () => {
 
       // Press Escape
       fireEvent.keyDown(emailInput, { key: "Escape" });
-      
+
       // Field should not be cleared by Escape (browser default behavior)
       // But it should not cause any errors
       expect(emailInput.value).toBe("test@example.com");
@@ -173,7 +173,7 @@ describe("Keyboard Navigation Tests", () => {
       // Arrow keys should work (implementation depends on Select component)
       fireEvent.keyDown(roleSelect, { key: "ArrowDown" });
       fireEvent.keyDown(roleSelect, { key: "ArrowUp" });
-      
+
       // Should not throw errors
       expect(roleSelect).toBeInTheDocument();
     });
@@ -292,7 +292,7 @@ describe("Keyboard Navigation Tests", () => {
       );
 
       const chart = screen.getByRole("img", { name: /test chart/i });
-      
+
       // Chart should be focusable
       chart.focus();
       expect(chart).toHaveFocus();
@@ -311,7 +311,7 @@ describe("Keyboard Navigation Tests", () => {
       );
 
       const chart = screen.getByRole("img", { name: /test chart/i });
-      
+
       chart.focus();
 
       // Test keyboard interactions
@@ -395,7 +395,7 @@ describe("Keyboard Navigation Tests", () => {
       // Should handle focus on disabled elements gracefully
       submitButton.focus();
       fireEvent.keyDown(submitButton, { key: "Enter" });
-      
+
       // Should not cause errors
     });
 
@@ -515,7 +515,7 @@ describe("Keyboard Navigation Tests", () => {
       await screen.findByText("User Management");
 
       const emailInput = screen.getByLabelText("Email");
-      
+
       // Focus should still work in high contrast mode
       emailInput.focus();
       expect(emailInput).toHaveFocus();

tests/unit/user-management.test.tsx

@@ -263,7 +263,7 @@ describe("UserManagementPage", () => {
 
       await waitFor(() => {
         const emailInput = screen.getByLabelText("Email") as HTMLInputElement;
-        
+
         fireEvent.change(emailInput, { target: { value: "invalid-email" } });
         fireEvent.blur(emailInput);