[switcher] Apps in spread should have icon to help distinguish between them

[Andrea Cimitan]

As summary, it is hard in spread browse between apps, many apps look the same at first glance, adding an app icon may help

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Desired design:
Add white overlay bar on top of the spread items. Anchored at the bottom of an item. Height 8 gu. Opacity 0.85.

Add button at the bottom left of the spread items above the white overlay bar. Icon height 6 gu. Left margin 1 gu. Vertically centered to the the white overlay.
UbuntuShape radius medium. BorderSource: "none".

See Right edge documentation: https://docs.google.com/a/canonical.com/document/d/1FC_-5yz5kPy_ZvTphaqxOgI5BPnALFbxRAO4eJkzlf8/edit#heading=h.rutyq59eqmc1

[Michael Zanetti (mzanetti)]

Need an icon for the dash in order to implement this.

[Vesa Rautiainen (vesar)]

In the desktop version of the spread (included in the switcher view) we have icons for application windows and I think we should include them in the phone version as well. From the UX point of view there is not much to be designed. It's more of a visual design task to decide the appearance.

Due to the more 3d appearance on the phone I don't think the icons can be positioned the same way as in the desktop switcher which is flat and below the window. I think in the mobile case we need to overlay the icon on top of the window (bottom left corner?) and rotate and scale it together with the actual spread item. But this is to be for the visual team.