Improve timeline switcher contentDescription and tooltip for accessibility

[Copilot]

The timeline switcher's contentDescription was set to just the timeline name (e.g., "Home"), omitting the control's purpose. It also called getTitle() twice and never updated tooltipText to match.

Changes

• New string resource sk_switch_timeline_content_description ("Switch timeline: %s") — conveys both action and current timeline name to screen readers
• updateSwitcherIcon — stores title in a local variable; derives contentDescription and tooltipText (API 26+) from the same formatted string

CharSequence currentTimelineTitle = timelines[i].getTitle(getContext());
timelineTitle.setText(currentTimelineTitle);
String switcherDescription = getString(R.string.sk_switch_timeline_content_description, currentTimelineTitle);
switcher.setContentDescription(switcherDescription);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    switcher.setTooltipText(switcherDescription);
}

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.14.1-bin/baw1sv0jfoi8rxs14qo3h49cs/gradle-8.14.1/lib/gradle-daemon-main-8.14.1.jar (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)