[openstreetmap/openstreetmap-website] Add recent diaries partial to profile page (PR #6010)

[Emin Kocan]

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### Description
<!--Describe your changes in detail. If you have made changes to the UI, include screenshots. If your PR addresses a Github issue, please link to it.-->
Closes #6009.
Adds recent diary entries partial and displays it on the user profiles pages by implementing a responsive card layout. It takes 4 most recent diary entries by default. Each diary entry is now shown in a Bootstrap card that displays the title, truncated content, comment count, and creation date. The layout is responsive - showing as a single column on mobile and two columns on larger screens

### How has this been tested?
Both testing manually to make sure it works along different screen sizes and adding tests to `users_controller_test.rb`.
<!--Explain the steps you took to test your code.-->
### Screenshots
<img width="1035" alt="Screenshot 2025-05-13 at 09 02 26" src="https://github.com/user-attachments/assets/969e5bf9-0f72-48da-b06b-d6ac8528c6d0" />

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

  https://github.com/openstreetmap/openstreetmap-website/pull/6010

-- Commit Summary --

  * Add recent diaries partial to profile

-- File Changes --

    A app/assets/images/calendar.svg (1)
    A app/assets/images/comment.svg (1)
    A app/assets/images/note.svg (1)
    M app/assets/stylesheets/common.scss (9)
    M app/models/user.rb (65)
    A app/views/diary_entries/_profile_diaries.html.erb (27)
    M app/views/users/show.html.erb (2)
    M config/locales/en.yml (2)
    M db/structure.sql (10)
    M test/controllers/users_controller_test.rb (44)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6010.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6010.diff

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