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

custom_components/houseplan/manifest.json

@@ -16,5 +16,5 @@
   "issue_tracker": "https://github.com/Matysh/houseplan-card/issues",
   "requirements": [],
   "single_config_entry": true,
-  "version": "1.30.0"
+  "version": "1.30.1"
 }