fix: Resolve test failures and VitePress build errors

[Copilot]

Two critical issues blocked PR validation: all Angular tests failing with TestBed initialization errors, and VitePress documentation build failing with module resolution and dead link errors.

Test Setup Fix

Angular TestBed was throwing "Cannot set base providers because it has already been called" when Vitest's setupFiles imported test-setup.ts for each test file. Added try-catch guard:

// client/src/test-setup.ts
try {
  destroyPlatform();
  getTestBed().initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());
} catch (error) {
  if (!(error as Error).message?.includes("Cannot set base providers")) {
    throw error;
  }
}

Result: 84 tests passing, 1 skipped.

VitePress Documentation Fixes

• Built libs/chartjs-financial and libs/indy-charts packages (missing dist directories)
• Replaced relative paths with GitHub URLs to avoid dead link validation errors
• Created missing guide/api-client.md page

VitePress now builds successfully.

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[cloudflare-workers-and-pages]

Deploying stock-charts with    Cloudflare Pages

Latest commit:	1605a52
Status:	✅  Deploy successful!
Preview URL:	https://b7dc9eac.stock-charts.pages.dev
Branch Preview URL:	https://copilot-sub-pr-454.stock-charts.pages.dev

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/graphql
  • Triggering command: /usr/bin/gh gh pr view --json reviews,comments (http block)
  • Triggering command: /usr/bin/gh gh pr view --json reviews (http block)
  • Triggering command: /usr/bin/gh gh pr view --json comments (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)