refactor(entry): consolidate application bootstrap entry point into main.tsx (Closes #737)

[stayzappy]

Objective & Overview

Closes #737

This Pull Request consolidates the application bootstrap path in stellar-dev-dashboard into a single canonical, strictly-typed entry point (src/main.tsx).

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Key Changes Made

1. Canonical Bootstrap Entry Point (src/main.tsx):

   • Converted src/main.jsx -> src/main.tsx with strict TypeScript types (ReactDOM.Root, HTMLElement, BootstrapResult).
   • Implemented environment capability validation (validateEnvironment) to verify modern browser APIs (fetch, localStorage, Promise) and prevent silent execution failures in legacy environments.
   • Implemented DOM container resolution (bootstrapApp): gracefully falls back to an emergency container (createFallbackContainer) if #root is missing from the DOM.
   • Guaranteed monitoring (initMonitoring) runs prior to React mounting.

2. Entry Script Update (index.html):

   • Updated <script type=module src="/src/main.jsx"></script> -> <script type=module src="/src/main.tsx"></script>.

3. Automated Unit Tests (src/__tests__/main.test.tsx):

   • Primary flow: Mounts cleanly to existing #root element.
   • Boundary case: Dynamically constructs styled fallback root container when #root is missing.
   • Failure case: validateEnvironment throws descriptive error when mandatory browser APIs are absent.

4. Architecture Documentation (docs/architecture/entry-points.md):

   • Documented application lifecycle, bootstrap steps, environment validation, and error recovery handling.

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Verification

• npm run test:unit -- src/__tests__/main.test.tsx -> 4 / 4 Unit Tests Passed (100% Success).

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[Manuelshub]

@stayzappy Please fix all the CI checks failure!

[Manuelshub]

@stayzappy Please fix CI checks failure!!!

[Manuelshub]

@stayzappy Please fix CI checks failure!!!