feat(FocusedWindow): Improve content width calculation and add size options

[lichie567]

There are two main changes in this PR:

1. Changes the FocusedWindow widget to use RowLayout instead of Row for improved content width calculation.
2. Replaces the "Compact Mode" toggle with a new context menu that allows for the selection of multiple sizes for the widget, along with a toggle for compact mode.

With this change, "Compact Mode" no longer has any affect on the widget's actual size, but only hides the app name prefix.

I've chosen the following sizes for each option:
Small -> Same size as the previous "Compact Mode" widget
Medium -> Same size as the previous normal widget
Large -> roughly 40% bigger than the previous normal widget
Largest -> roughly 80% bigger than the previous normal widget

I'm open to changing these sizes if you have any feedback.