docs: a11y R4 time elements README (#554)

deploy/gitea-a11y/README.md

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+# Gitea Accessibility Fix - R4: Time Elements
+
+WCAG 1.3.1: Relative timestamps lack machine-readable fallbacks.
+
+## Fix
+
+Wrap relative timestamps in `<time datetime="...">` elements.
+
+## Files
+
+- `custom/templates/custom/time_relative.tmpl` - Reusable `<time>` helper
+- `custom/templates/repo/list_a11y.tmpl` - Explore/Repos list override
+
+## Deploy
+
+```bash
+cp -r custom/templates/* /path/to/gitea/custom/templates/
+systemctl restart gitea
+```
+
+Closes #554

deploy/gitea-a11y/custom/templates/custom/time_relative.tmpl

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+{{/*
+  Gitea a11y fix: R4 <time> elements for relative timestamps
+  Deploy to: custom/templates/custom/time_relative.tmpl
+*/}}
+
+{{define "custom/time_relative"}}
+{{if and .Time .Relative}}
+<time datetime="{{.Time.Format "2006-01-02T15:04:05Z07:00"}}" title="{{.Time.Format "Jan 02, 2006 15:04"}}">
+  {{.Relative}}
+</time>
+{{else if .Relative}}
+<span>{{.Relative}}</span>
+{{end}}
+{{end}}
+
+{{define "custom/time_from_unix"}}
+{{if .Relative}}
+<time datetime="" data-unix="{{.Unix}}" title="">{{.Relative}}</time>
+<script>
+(function() {
+  var el = document.currentScript.previousElementSibling;
+  var unix = parseInt(el.getAttribute('data-unix'));
+  if (unix) { el.setAttribute('datetime', new Date(unix * 1000).toISOString()); el.setAttribute('title', new Date(unix * 1000).toLocaleString()); }
+})();
+</script>
+{{end}}
+{{end}}

deploy/gitea-a11y/custom/templates/repo/list_a11y.tmpl

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+{{/*
+  Gitea a11y fix: R4 <time> elements for relative timestamps on repo list
+  Deploy to: custom/templates/repo/list_a11y.tmpl
+*/}}
+
+{{/* Star count link with aria-label */}}
+<a class="repo-card-star" href="{{.RepoLink}}/stars" aria-label="{{.NumStars}} stars" title="{{.NumStars}} stars">
+  <svg class="octicon octicon-star" viewBox="0 0 16 16" width="16" height="16" aria-hidden="true">
+    <path d="M8 .25a.75.75 0 01.673.418l1.882 3.815 4.21.612a.75.75 0 01.416 1.279l-3.046 2.97.719 4.192a.75.75 0 01-1.088.791L8 12.347l-3.766 1.98a.75.75 0 01-1.088-.79l.72-4.194L.818 6.374a.75.75 0 01.416-1.28l4.21-.611L7.327.668A.75.75 0 018 .25z"/>
+  </svg>
+  <span>{{.NumStars}}</span>
+</a>
+
+{{/* Fork count link with aria-label */}}
+<a class="repo-card-fork" href="{{.RepoLink}}/forks" aria-label="{{.NumForks}} forks" title="{{.NumForks}} forks">
+  <svg class="octicon octicon-repo-forked" viewBox="0 0 16 16" width="16" height="16" aria-hidden="true">
+    <path d="M5 5.372v.878c0 .414.336.75.75.75h4.5a.75.75 0 00.75-.75v-.878a2.25 2.25 0 111.5 0v.878a2.25 2.25 0 01-2.25 2.25h-1.5v2.128a2.251 2.251 0 11-1.5 0V8.5h-1.5A2.25 2.25 0 013.5 6.25v-.878a2.25 2.25 0 111.5 0zM5 3.25a.75.75 0 10-1.5 0 .75.75 0 001.5 0zm6.75.75a.75.75 0 100-1.5.75.75 0 000 1.5zm-3 8.75a.75.75 0 10-1.5 0 .75.75 0 001.5 0z"/>
+  </svg>
+  <span>{{.NumForks}}</span>
+</a>
+
+{{/* Relative timestamp with <time> element for a11y */}}
+{{if .UpdatedUnix}}
+<time datetime="{{.UpdatedUnix | TimeSinceISO}}" title="{{.UpdatedUnix | DateFmtLong}}" class="text-light">
+  {{.UpdatedUnix | TimeSince}}
+</time>
+{{end}}