applet: Surface middle-clickability in the UI
The Audio Volume System Tray applet can be middle-clicked to mute and unmute the system, but this is a hidden feature you would never discover if you didn't read Kai's blog. :) The feature is quite handy so let's expose it to more users by mentioning it in the tooltip subtext.
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Please keep conceptual discussion ("do we really want to do this?") in plasma-workspace!2205 (merged) and only use this MR for design and implementation discussion. Thanks!