Remove waybar; relocate bar helper scripts into the shell tree

omarchy-shell's bar plugin replaces waybar on every default path, so the
waybar package, configs, indicator scripts, and toggle/restart/refresh
binaries all go away in this commit.

The four small helper scripts that Bar.qml shells out to (weather.sh and
indicators/*.sh) move with the shell rather than disappear \u2014 they live
at default/quickshell/omarchy-shell/scripts/ now, alongside the rest of
the shell code.

Companion script changes:
  - omarchy-shell-ipc gains --if-running so fire-and-forget refresh
    callers (toggle-idle, toggle-notification-silencing,
    update-available-reset, capture-screenrecording) don't accidentally
    spawn the shell when it isn't already up.
  - omarchy-theme-set, omarchy-tz-select, omarchy-voxtype-{install,model},
    omarchy-toggle-nightlight, omarchy-voxtype-config drop their waybar
    branches and comments.
  - omarchy-voxtype-status's summary stops claiming it's a Waybar helper.
  - omarchy-base.packages drops waybar; install/packaging/fonts.sh's
    comment points at the new bar consumer.
  - SKILL.md / AGENTS.md / omarchy-menu.jsonc lose their waybar entries.
  - test/omarchy-cli-test.sh substitutes a remaining toggle command.

default/omarchy/omarchy-menu.jsonc

@@ -157,7 +157,7 @@
   "setup.default.editor.emacs": {"icon":"","label":"Emacs","when":"omarchy-cmd-present emacs","checked":"default_editor_is emacs","action":"omarchy-default-editor emacs"},
   "setup.dns": {"icon":"󰱔","label":"DNS","keywords":"network","action":"present_terminal omarchy-setup-dns"},
   "setup.security": {"icon":"","label":"Security","keywords":"fingerprint fido2"},
-  "setup.config": {"icon":"","label":"Config","keywords":"files hyprland bar quickshell walker waybar"},
+  "setup.config": {"icon":"","label":"Config","keywords":"files hyprland bar quickshell walker"},
   "setup.security.fingerprint": {"icon":"󰈷","label":"Fingerprint","action":"present_terminal omarchy-setup-security-fingerprint"},
   "setup.security.fido2": {"icon":"","label":"Fido2","keywords":"key","action":"present_terminal omarchy-setup-security-fido2"},
   "setup.config.hyprland": {"icon":"","label":"Hyprland","action":"open_in_editor \"$(hypr_config_file hyprland)\""},