Fix example app layout

[knexer]

Add a status bar with:

• current application state
• controls (run/stop/???)

Also, fix the example application layout so the task details view is bound to half the screen, and scrolls.

[knexer]

Done in 8e2d026d2116c70a1bdbeaa86079d3cfb2df099c and 8da21c639ed4837ec4b5c5789c3bca94c4452c91