webui: automation settings panel, set-location, responsive layout

- Automation tab: settings form (define_settings) beside the editor,
  stacking above it when narrow; script/settings save split.
- Set location modal: current location + reset checkbox.
- saveScriptSettings/setSavePath API wiring; plugins panel.

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

public/plugins/plugins.json

@@ -0,0 +1,5 @@
+{
+  "modules": [
+    "/plugins/health.js"
+  ]
+}