Refactor globalThis usage by moving functions to utils.js

[friuns2]

Refactors global function usage by introducing a utils.js module and updating component imports.

• Adds utils.js with updateLocation, calculateDirections, and clearMarkers functions, exporting them for use across the application.
• Updates Vue components (AttractionDetails.vue, LocationModal.vue, AttractionList.vue, MapView.vue, and pages/index.vue) to import and use functions from utils.js instead of accessing them through globalThis.
• Removes globalThis references in the updated components, replacing them with the imported functions from utils.js.
• Maintains functionality while improving code organization and modularity by centralizing common functions used across multiple components.

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