fix: replace @mui/icons-material with @iconify/react (v0.2.3)

Material-UI icons were not provided as globals by Headlamp, causing
'undefined is not an object (evaluating Ct.createSvgIcon)' errors.

Headlamp provides @iconify/react as a global, so all icon imports have
been replaced with Iconify equivalents:
- ErrorOutline → mdi:alert-circle-outline
- ContentCopy → mdi:content-copy
- Visibility → mdi:eye
- VisibilityOff → mdi:eye-off
- CheckCircle → mdi:check-circle
- Error → mdi:alert-circle
- Warning → mdi:alert
- Add → mdi:plus
- Delete → mdi:delete

Changes:
- Replaced all @mui/icons-material imports with @iconify/react Icon component
- Updated 4 component files (ErrorBoundary, DecryptDialog, EncryptDialog, ControllerStatus)
- Bumped version to 0.2.3
- Bundle size reduced: 358.18 kB (98.04 kB gzipped)
- Checksum: SHA256:03787323abc9430a63433838253b2dd8296d237000acdfe4ce2507678b63125f

This should fix the plugin loading issue and make the sidebar entry appear.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

headlamp-sealed-secrets/package-lock.json

@@ -1,17 +1,18 @@
 {
   "name": "headlamp-sealed-secrets",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "headlamp-sealed-secrets",
-      "version": "0.2.1",
+      "version": "0.2.2",
       "license": "Apache-2.0",
       "dependencies": {
         "node-forge": "^1.3.1"
       },
       "devDependencies": {
+        "@iconify/react": "^6.0.2",
         "@kinvolk/headlamp-plugin": "^0.13.0",
         "@types/node-forge": "^1.3.11",
         "typedoc": "^0.28.16",
@@ -1486,13 +1487,16 @@
       }
     },
     "node_modules/@iconify/react": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/@iconify/react/-/react-3.2.2.tgz",
-      "integrity": "sha512-z3+Jno3VcJzgNHsN5mEvYMsgCkOZkydqdIwOxjXh45+i2Vs9RGH68Y52vt39izwFSfuYUXhaW+1u7m7+IhCn/g==",
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/@iconify/react/-/react-6.0.2.tgz",
+      "integrity": "sha512-SMmC2sactfpJD427WJEDN6PMyznTFMhByK9yLW0gOTtnjzzbsi/Ke/XqsumsavFPwNiXs8jSiYeZTmLCLwO+Fg==",
       "dev": true,
       "license": "MIT",
+      "dependencies": {
+        "@iconify/types": "^2.0.0"
+      },
       "funding": {
-        "url": "http://github.com/sponsors/cyberalien"
+        "url": "https://github.com/sponsors/cyberalien"
       },
       "peerDependencies": {
         "react": ">=16"
@@ -1916,6 +1920,19 @@
         "headlamp-plugin": "bin/headlamp-plugin.js"
       }
     },
+    "node_modules/@kinvolk/headlamp-plugin/node_modules/@iconify/react": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@iconify/react/-/react-3.2.2.tgz",
+      "integrity": "sha512-z3+Jno3VcJzgNHsN5mEvYMsgCkOZkydqdIwOxjXh45+i2Vs9RGH68Y52vt39izwFSfuYUXhaW+1u7m7+IhCn/g==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "http://github.com/sponsors/cyberalien"
+      },
+      "peerDependencies": {
+        "react": ">=16"
+      }
+    },
     "node_modules/@mdx-js/react": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/@mdx-js/react/-/react-3.1.1.tgz",