Tweak offcanvas sidebar look and behavior

[jraddaoui]

• Move close button to the top-right corner.
• Match default sidebar width and look.
• Close it when a navigation link is clicked.

Refs #1079.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.66%. Comparing base (dfad0eb) to head (7d4637f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1080 +/- ## ======================================= Coverage 54.66% 54.66% ======================================= Files 105 105 Lines 7696 7696 ======================================= Hits 4207 4207 Misses 3229 3229 Partials 260 260 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests
• JS Bundle Analysis - Avoid shipping oversized bundles