[openstreetmap/openstreetmap-website] Revise search forms (PR #5765)

[Marwin Hochfelsner]

### Description
- Changes search form to explicit display-flex, removing the need for col divs.
- Moves the directions form's routing markers inside the input field to be more compact.

before:
![openstreetmap org_directions](https://github.com/user-attachments/assets/ef90daf3-c550-4d82-b529-44e14ff7de51)
after:
![openstreetmap org_directions](https://github.com/user-attachments/assets/21770294-f5fc-4e90-ac7f-b48d81678578)

and in rtl:
![openstreetmap org_directions](https://github.com/user-attachments/assets/f1ad19fc-93ac-42a4-9326-f2ff198bfece)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5765

-- Commit Summary --

  * Revise search forms

-- File Changes --

    M app/assets/stylesheets/common.scss (2)
    M app/views/layouts/_search.html.erb (73)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5765.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5765.diff

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