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>

src/components/EncryptDialog.tsx

@@ -115,8 +115,11 @@ export function EncryptDialog({ open, onClose }: EncryptDialogProps) {
       setScope('strict');
       setKeyValues([{ key: '', value: '', showValue: false }]);
       onClose();
-    } catch (error: any) {
-      enqueueSnackbar(`Failed to create SealedSecret: ${error.message}`, { variant: 'error' });
+    } catch (error: unknown) {
+      enqueueSnackbar(
+        `Failed to create SealedSecret: ${error instanceof Error ? error.message : String(error)}`,
+        { variant: 'error' }
+      );
     }
   };