Fix past activities tab resetting to upcoming when paginating

[Copilot]

Navigating to a different page in the past activities section always reset the view to the upcoming tab because the Stimulus tabs controller initialized with indexValue = 0 unconditionally, and the tab <button> elements had no value attribute making change() non-functional.

Changes

• Tab buttons → anchor links with URL-based hrefs (/events for upcoming, /events?tab=1 for past), delegating tab switching to Turbo navigation instead of client-side JS
• data-tabs-index-value="<%= params[:tab].to_i %>" added to the controller element so the Stimulus Tabs controller initializes from the server-rendered URL param on every page load
• data-turbo-action="replace" on tab links to avoid polluting browser history with tab state
• role="tab" added for accessibility (the controller already manages aria-selected dynamically)

<div data-controller="tabs"
     data-tabs-index-value="<%= params[:tab].to_i %>"
     data-tabs-active-tab="...">
  <a href="<%= events_path %>" role="tab" data-turbo-action="replace" data-tabs-target="tab">Binnenkort</a>
  <a href="<%= events_path(tab: 1) %>" role="tab" data-turbo-action="replace" data-tabs-target="tab">Vroegâh</a>

Pagy naturally propagates tab=1 through all pagination links via request.GET, so no changes to the pagination partial or controller are needed. The full navigation chain: /events?tab=1 → Pagy generates /events?tab=1&page=N → each page renders with data-tabs-index-value="1".

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:

• ddnexus.github.io
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns 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)