feat(core,app): a history page

Every played episode, newest first, under Today, Yesterday, a weekday or a
date. A row shows the still (which plays it), the title (which opens it),
the episode, and where it stopped or that it was finished. Removing a row
resets that file to never played, with an Undo. History sits second in the
top bar, so Ctrl+1 to Ctrl+5 now run Library, History, Shares, Downloads,
Settings.

Cargo.lock

@@ -4404,6 +4404,7 @@ name = "pstr-app"
 version = "0.4.2"
 dependencies = [
  "anyhow",
+ "chrono",
  "dbus",
  "directories",
  "eframe",