fix v1.30.1: space gear visible in every mode + vertical alignment

- cog next to the space name shows in View/Plan/Devices (canEdit only);
  '+' add-space tab stays Plan-only
- tabs flex-centered so the cog aligns with the tab text
- smoke_gear_tabs.mjs; TESTING.md + CHANGELOG same-commit

package.json

@@ -1,6 +1,6 @@
 {
   "name": "houseplan-card",
-  "version": "1.30.0",
+  "version": "1.30.1",
   "description": "Interactive house plan Lovelace card for Home Assistant",
   "license": "MIT",
   "type": "module",