Expose the shell's remaining UI-only toggles over IPC

Every toggle you could only reach by mouse or panel hotkey is now
scriptable through omarchy-shell:

- omarchy.bluetooth toggleBluetooth — the radio (was right-click / B)
- omarchy.network toggleNetwork — Wi-Fi on/off (was W in the panel)
- omarchy.tailscale toggleTailscale — the connection as one call,
  matching the widget's right-click, instead of separate up/down
- omarchy.clock toggleWeekStart — calendar week start (was W)
- shell toggleBarTransparency — the bar background (was manage UI only)

Bluetooth and network follow the power/monitor pattern: manageIpc: false
so the panel owns the target's single IpcHandler and can extend it past
the inherited lifecycle methods.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/shell.d/tailscale-test.sh

@@ -5,7 +5,11 @@ set -euo pipefail
 source "$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)/base-test.sh"
 
 run_node_test <<'JS'
+const fs = require('fs')
 const tailscale = requireFromRoot('shell/plugins/panels/tailscale/Model.js')
+const panelSource = fs.readFileSync(root + '/shell/plugins/panels/tailscale/Panel.qml', 'utf8')
+
+assert(/function toggleTailscale\(\): string \{ tailscale\.toggleTailscale\(\); return "ok" \}/.test(panelSource), 'tailscale exposes the connection toggle over IPC')
 
 assertDeepEqual(
   tailscale.filterIPv4(['100.64.0.1', 'fd7a:115c:a1e0::1', '192.168.1.2']),