fix: restore expected scroll behavior during route navigation

[Praizfotos]

Summary

Closes #246

This PR improves navigation by resetting the scroll position to the top of the page whenever users navigate to a new route, while preserving the browser's native scroll restoration behavior for Back and Forward navigation.

Problem

Previously, navigating between routes preserved the previous page's scroll position. For example, opening a project after scrolling to the bottom of the project list caused the detail page to open halfway down instead of starting at the top.

Solution

Introduced a lightweight ScrollToTop component in bimex-frontend/src/App.jsx.

Behavior:

• Scrolls to (0, 0) on PUSH navigation.
• Scrolls to (0, 0) on REPLACE navigation.
• Preserves native browser scroll restoration on POP navigation.
• Uses useNavigationType from react-router-dom.
• Adds no new dependencies.

Validation

• ✅ npm run test:run (139/139 tests passing)
• ✅ npm run build
• ✅ npm run lint (no new warnings or errors)

Scope

• Small UI/UX improvement (~12 lines of code)
• No business logic changes
• No new dependencies
• No unrelated modifications

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[David1984TK]

Fix legítimo del comportamiento estándar de scroll en SPAs con react-router: sin esto, navegar entre rutas mantiene el scroll donde estaba en vez de resetear a top. Cambio chico, acotado, CI real en verde. Aprobado.