refactor: improve component architecture, loading states, and mobile accessibility

[eyooTech]

Summary

This PR introduces several frontend improvements focused on maintainability, user experience, and accessibility.

Changes

Property Card Refactor (#510)

• Extracted property card data logic into a dedicated usePropertyCardData hook.
• Consolidated store interactions and derived values into a normalized data layer.
• Reduced component complexity and improved separation of concerns.
• Added tests covering the extracted hook behavior.

Deep Import Enforcement (#512)

• Added linting rules to discourage barrel imports across components.
• Encouraged direct component imports to improve code-splitting and bundle efficiency.
• Updated import guidelines and related documentation.

Analytics Loading Experience (#516)

• Added row-level shimmer placeholders for analytics tab loading states.
• Matched placeholder layout with existing chart skeletons to reduce cumulative layout shift (CLS).
• Added tests covering loading-state rendering behavior.

Mobile Navigation Accessibility (#519)

• Increased mobile navigation touch targets to meet WCAG 2.5.5 recommendations (minimum 44×44px interactive area).
• Improved icon spacing and tap accuracy on smaller screens.
• Added accessibility-focused test coverage and updated documentation.

Testing

• Added/updated unit tests for extracted hooks and loading components.
• Added accessibility coverage for mobile navigation interactions.
• Verified existing functionality remains unchanged.

Documentation

• Updated relevant comments and documentation to reflect the new architecture, loading states, and accessibility improvements.

Closes #510

Closes #512

Closes #516

Closes #519

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[nanaf6203-bit]

Component-level improvements and mobile nav polish — work that users will feel. Clean. Merging.