docs(readme): showcase launcher and bar controls

Author: josteinhanssen

README.md

@@ -26,7 +26,23 @@ set of buttons:
 > AI-assisted software can make an informed choice. Contributions remain the
 > responsibility of the humans who submit and review them.
 
-![Caffeinate settings in Noctalia](caffeinate/preview.png)
+## Caffeinate in action
+
+### Ask for exactly the time you need
+
+Type any supported duration and review the resolved action before starting the
+session.
+
+![Noctalia launcher resolving a Caffeinate session for 1 minute 30 seconds](docs/images/launcher-duration.png)
+
+### Keep the current session close
+
+The bar stays compact until you need it: hover for exact seconds, then
+left-click for presets, cancellation, and launcher access.
+
+<p align="center">
+  <img src="docs/images/bar-session-panel.png" width="560" alt="Caffeinate bar widget showing exact seconds with its expanded session panel">
+</p>
 
 ## Features