chore: add barrel exports for components/screens/hooks and update imports

[EtimbukUdofia]

Summary

This PR improves import ergonomics by introducing/expanding barrel exports and updating imports to use the new entry points.

What Changed

• Added a top-level barrel for components.
• Added a screens barrel.
• Expanded hooks barrel exports.
• Updated relevant imports to consume barrel paths instead of verbose direct paths.

Scope

• Refactor-only, no feature behavior changes.
• No unrelated files were intentionally modified.

Why

This reduces import verbosity, improves consistency across the codebase, and makes module discovery easier for contributors.

Validation

• Verified TypeScript/editor diagnostics for touched files after refactor.
• Confirmed no functional logic changes were introduced.

Issue

Close #100

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