[openstreetmap/openstreetmap-website] Logo Refresh (PR #6652)

[Adithyaa Saravanam]

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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.-->

Addressing issue [#6651](https://github.com/openstreetmap/openstreetmap-website/issues/6651) by adding automatic page refresh functionality when clicking the OpenStreetMap logo, eliminating the need for pressing F5.

### How has this been tested?
<!--Explain the steps you took to test your code.-->

**Desktop Testing:**
- [x] Clicked logo on homepage (`/`) → page refreshes automatically
- [x] Clicked logo on `/about` → navigates to homepage
- [x] Clicked logo on `/communities` → navigates to homepage
- [x] Clicked logo on `/export` → navigates to homepage
- [x] Clicked logo on `/copyright` → navigates to homepage

**Mobile Testing:**
- [x] Tested in Chrome DevTools responsive mode (iPhone, Android)
- [x] Verified touch events work correctly
- [x] Confirmed behavior matches desktop

**Code Quality Checks (via Docker):**
- [x] **Rubocop**: 912 files inspected, no offenses detected ✓
- [x] **ERB Lint**: No errors found in ERB files ✓
- [x] **JavaScript**: Inline code follows standard syntax ✓

**Browser Compatibility:**
- [x] Chrome - tested
- [x] Firefox - tested
- [x] Safari - tested 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6652

-- Commit Summary --

  * Logo Refresh

-- File Changes --

    M app/views/layouts/_header.html.erb (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6652.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6652.diff

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