feat(notification): Animate (blink) clock entering done mode (#65)

Optional.

demo/blink.tape

@@ -0,0 +1,23 @@
+Output demo/blink.gif
+
+# https://github.com/charmbracelet/vhs/blob/main/THEMES.md
+Set Theme "nord-light"
+
+Set FontSize 14
+Set Width 800
+Set Height 400
+Set Padding 0
+Set Margin 1
+
+# --- START ---
+Set LoopOffset 4
+Hide
+# countdown 1.0s
+Type "cargo run -- -r -m countdown -d -c 1 --blink=on"
+Enter
+Sleep 0.2
+Type "m"
+Type ":::"
+Show
+Type "s"
+Sleep 4