Fix landmark violation: Use aside elements for presentation controls

[Copilot]

Axe accessibility scanner flagged <div class="clock"> and <div class="progress"> on /presentations/atag-fosdem26.html for not being contained within landmarks (WCAG 2.1 region rule).

Changes

Changed non-landmark divs to semantic aside elements with descriptive labels:

-  <div class="progress"></div>
-  <div class="clock"></div>
+  <aside class="progress" aria-label="Presentation progress"></aside>
+  <aside class="clock" aria-label="Presentation timer"></aside>

Aside elements are complementary content landmarks appropriate for presentation UI controls.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://storage.googleapis.com/chromium-browser-snapshots/Linux_x64/869685/chrome-linux.zip
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node install.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Accessibility issue: All page content should be contained by landmarks on /presentations/atag-fosdem26.html</issue_title>
<issue_description>## What
An accessibility scan flagged the element <div class="clock" aria-label="clock"> on https://ox.ca/presentations/atag-fosdem26.html because all page content should be contained by landmarks. Learn more about why this was flagged by visiting https://dequeuniversity.com/rules/axe/4.11/region?application=playwright.

To fix this, ensure all page content is contained by landmarks.

Specifically:

Fix any of the following:

• Some page content is not contained by landmarks

Acceptance Criteria

• The specific axe violation reported in this issue is no longer reproducible.
• The fix MUST meet WCAG 2.1 guidelines OR the accessibility standards specified by the repository or organization.
• A test SHOULD be added to ensure this specific axe violation does not regress.
• This PR MUST NOT introduce any new accessibility issues or regressions.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Accessibility issue: All page content should be contained by landmarks on /presentations/atag-fosdem26.html #10

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