fix: remove any types, dead code, unused exports; add comprehensive tests

- Fix handleRotate bug ignoring Result from rotateSealedSecret()
- Fix dead code branch in useControllerHealth
- Replace all `any` types with `unknown` + type guards
- Delete unused functions/exports (452 lines removed)
- Add 18 new test files covering all hooks, libs, and components
- 233 tests passing, zero tsc errors, zero lint issues

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "sealed-secrets",
-  "version": "0.2.21",
+  "version": "0.2.22",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "sealed-secrets",
-      "version": "0.2.21",
+      "version": "0.2.22",
       "license": "Apache-2.0",
       "dependencies": {
         "node-forge": "^1.3.1"