chore: standardize config and fix component test mocks

- Replace .eslintrc.json with .eslintrc.js (standard @headlamp-k8s/eslint-config)
- Create .prettierrc.js (standard Headlamp prettier config)
- Add .headlamp-plugin/, .env, .env.local, .eslintcache to .gitignore
- Remove .claude/settings.json and .claude/settings.local.json from .gitignore
- Create .claude/settings.local.json with enabled MCP servers
- Remove "Subagent guidance" section and hardcoded test count from CLAUDE.md
- Fix 8 component test files: replace require('./__mocks__/commonComponents.ts')
  with await import('./__mocks__/commonComponents') in vi.mock factories —
  require() cannot process TypeScript in hoisted mock context

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
-  "name": "headlamp-tns-csi-plugin",
-  "version": "0.1.0",
+  "name": "tns-csi",
+  "version": "0.2.4",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "headlamp-tns-csi-plugin",
-      "version": "0.1.0",
+      "name": "tns-csi",
+      "version": "0.2.4",
       "license": "Apache-2.0",
       "devDependencies": {
         "@kinvolk/headlamp-plugin": "^0.13.0"