[openstreetmap/openstreetmap-website] Fix Apple logo aspect ratio and dark mode appearance on login page (PR #6336)

[Anuraag Tandon]

Fixed Apple logo aspect ratio by using viewbox in SVG.
Additionally, updated the logo styling so it displays correctly in dark mode, improving readability and visual consistency.  

Fixes #6328  

### Before

**Light mode:**  
<img width="782" height="126" alt="before" src="https://github.com/user-attachments/assets/c42e1796-2688-4090-b0e0-c14d79c973ac" />

**Dark mode:**  
<img width="386" height="162" alt="beforeDark" src="https://github.com/user-attachments/assets/840b1404-ee54-4ff4-8303-7310b68b7ed7" />

### After

**Light mode:**  
<img width="377" height="130" alt="AfterLight" src="https://github.com/user-attachments/assets/2639e929-3047-41f8-b557-da229da76a05" />

**Dark mode:**  
<img width="381" height="117" alt="afterDark" src="https://github.com/user-attachments/assets/ea80e608-9fb3-4263-9732-0bcf19ec2a24" />

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

  https://github.com/openstreetmap/openstreetmap-website/pull/6336

-- Commit Summary --

  * Fix Apple logo aspect ratio and dark mode appearance on login page

-- File Changes --

    M app/assets/images/auth_providers/apple.svg (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6336.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6336.diff

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