[Public user] Implement change viewport behaviour

[overeha]

User Story
As a user, when I change the viewport by zooming out or zooming in or by dragging the map, my search should be rerun automatically.

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Description
If I performed a search or even if I am in the default state of the map if I change the map either by zooming in/out or by dragging the map in any direction, the system should rerun my search on the new viewport.

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Alternative flow
When user moves the viewport, they can re-run the search manually on the new viewport by clicking on the button "Caută în această zonă". After the search is rerun the button should disappear.

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Main Flow

1. Perform a search or just enter the platform
2. See displayed pins
3. Drag or zoom on the map
4. The "Caută în această zonă" button is displayed on the map.
5. Click on the button to re run the search manually
6. Nice to have: While the search/filtering is re-run, button shows loading animation on icon
7. After the search/filtering is re-run in the new viewport, button dissapears, results are shown.

See figma for this here

Business Requirements
N/A