fix(waybar): drop the dead summer-night date on-click (kitty calcurse)

The default theme's clock#date wired on-click to `kitty calcurse`, but
kitty isn't a default-installed app (alacritty is the terminal) and
calcurse isn't installed anywhere — so clicking the date did nothing.
The default config.jsonc uses xdg-terminal-exec/alacritty for its
clicks and summer-day's date has no on-click. Drop the dead action
(tooltip: false), matching summer-day.

Found during the Pillar 9 Component 6 (apps) pass, which confirmed
btop/ghostty/kitty/lazygit/tmux ship config-only by design (the
installer/user picks the binary) — not a bug. Logged two follow-ups:
summer-day's wofi --term=kitty launcher, and shipping a calendar app.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

features/desktop/waybar/themes/summer-night/config.jsonc

@@ -154,8 +154,7 @@
 
 "clock#date": {
   "format": " {:%A, %B %d, %Y}",
-  "on-click": "kitty calcurse",
-  "tooltip-format": "Open calendar"
+  "tooltip": false
 },
 
 "custom/powermenu": {