Fixes two warnings when opening the inspector on my PinePhone, these two
files were attempted to be loaded as PNG (as per the extension) instead
of SVG.
Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Add a ::show-peek-icon property and show a clickable
icon when it is set. Clicking it toggles the visibility
of the content. The same functionality is also accessible
via a context menu item.
This is a common feature of password entries.
