test(e2e): implement Playwright browser happy path test

docs/testing/E2E_GUIDELINES.md

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+# Playwright Browser E2E Testing Standards
+
+Our frontend functional execution flows are guarded via automated Playwright UI verification suites to intercept interface breaking changes.
+
+## Core Best Practices
+* **Test Attribute Selectors:** Use explicit `data-testid` properties inside JSX code structures rather than styling classes to prevent UI refactoring breaks.
+* **Deterministic Isolation:** Ensure testing targets interact against stable staging servers or mock environment routes (`/claim/test-token`) to prevent external ledger dependencies from destabilizing CI test performance.

frontend/e2e/claim-flow.spec.ts

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+import { test, expect } from '@playwright/test';
+
+test.describe('Issue #61/#138: Token Claim Flow E2E Happy Path Matrix', () => {
+
+  test('should navigate through the entire token claim pipeline successfully', async ({ page }) => {
+    // 1. Visit the targeted claim landing page route
+    await page.goto('/claim/test-token');
+
+    // 2. Acceptance Criteria: Verify the token status indicator is present and active
+    const statusBadge = page.locator('[data-testid="claim-status-available"]');
+    await expect(statusBadge).toBeVisible();
+    await expect(statusBadge).text().toContain('Available');
+
+    // 3. Fill in a valid destination wallet parameter
+    const walletInput = page.locator('input[name="walletAddress"]');
+    await expect(walletInput).toBeVisible();
+    await walletInput.fill('GBALBEDO76V6K67X4PZ72NC556XU54K75QNZP2Z5F4O7V6Y456QWERTY');
+
+    // 4. Submit the claim form
+    const submitButton = page.locator('button[type="submit"]');
+    await submitButton.click();
+
+    // 5. Assert the loading transition wraps and displays the success screen elements
+    const successScreen = page.locator('[data-testid="claim-success-container"]');
+    await expect(successScreen).toBeVisible({ timeout: 10000 }); // Graceful allowance for mock pipeline propagation lag
+
+    const successHeader = page.locator('h2');
+    await expect(successHeader).text().toContain('Claim Submitted Successfully!');
+  });
+});