feat(frontend): implement mock wallet sandbox, global state tests, modal a11y, and route preloading

[king-aj-the-first]

Detailed PR Description

Summary

This pull request addresses Part 4 enhancements across four frontend domains within stellar_card-frontend:

1. [frontend] Implement mock wallet connection sandbox context (Part 4) #469 [frontend] Mock Wallet Sandbox Context (Part 4):
   • Added comprehensive integration tests for MockWalletProvider and sandbox context (MockWalletProvider.test.tsx).
   • Validated scenario defaults, override options, and action dispatching for mock Web3 connection states.
2. [frontend] Add unit tests for global state management hooks (Part 4) #470 [frontend] Unit Tests for Global State Management Hooks (Part 4):
   • Enhanced useGlobalState with a robust GlobalStateProvider, custom transition hooks (setStatus, setError, reset, retry), and state reflection.
   • Added exhaustive unit tests covering initialization, error propagation, retries, and context safety (useGlobalState.test.tsx).
3. [frontend] Improve keyboard accessibility and ARIA tags in modal windows (Part 4) #471 [frontend] Improve Keyboard Accessibility & ARIA in Modals (Part 4):
   • Enhanced Modal and Drawer components with explicit ariaLabel, ariaDescribedBy, and flexible dialog roles (dialog / alertdialog).
   • Ensured fallback linking to auto-generated IDs and covered these accessibility improvements with tests (modal-accessibility.test.tsx).
4. [frontend] Optimize bundle splitting and route-level lazy loading (Part 4) #472 [frontend] Route-Level Lazy Loading & Preloading (Part 4):
   • Extended RoutePreloadManager with query methods (getQueue, getLoadedRoutes, hasRoute, clear) for fine-grained lifecycle management and inspectability.
   • Added comprehensive Part 4 unit tests verifying queue prioritization, load lifecycles, and cache clearing (dynamic-routes.test.tsx).

Issue References

• Closes [frontend] Implement mock wallet connection sandbox context (Part 4) #469
• Closes [frontend] Add unit tests for global state management hooks (Part 4) #470
• Closes [frontend] Improve keyboard accessibility and ARIA tags in modal windows (Part 4) #471
• Closes [frontend] Optimize bundle splitting and route-level lazy loading (Part 4) #472

Test Plan

• Run vitest unit test suite for MockWalletProvider.test.tsx (Part 4 mock sandbox)
• Run vitest unit test suite for useGlobalState.test.tsx (Part 4 state hooks)
• Run vitest unit test suite for modal-accessibility.test.tsx (Part 4 modal ARIA / a11y)
• Run vitest unit test suite for dynamic-routes.test.tsx (Part 4 lazy loading and preloader)

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