test: remove obsolete vite-plugin tests and stub localStorage for collaboration tests

Removed tests that were testing the old @thread decorator approach:
- scan-actors.ts and scan-actors.test.ts
- generate-worker-entry.ts and generate-worker-entry.test.ts
- dev-server.test.ts and plugin.test.ts
- worker-entry-template.ts

Added localStorage stub for collaboration package tests to fix failures
caused by the @d-buckner/peer-pressure dependency checking for localStorage
at module load time in Node.js environment.

All tests now passing (373 tests across all packages).

Author: d-buckner

packages/collaboration/vitest.config.ts

@@ -1,10 +1,9 @@
 import { defineConfig } from 'vitest/config';
 
-
 export default defineConfig({
   test: {
     globals: true,
     environment: 'node',
-    setupFiles: ['./src/test-setup.ts'],
+    setupFiles: ['./vitest.setup.ts', './src/test-setup.ts'],
   },
 });

packages/collaboration/vitest.setup.ts

@@ -0,0 +1,15 @@
+/**
+ * Global setup file that runs before any test files are loaded
+ * Used to stub browser APIs that aren't available in Node.js
+ */
+
+// Stub localStorage before any modules are loaded
+// Must be defined as actual methods, not arrow functions
+globalThis.localStorage = {
+  getItem: function() { return null; },
+  setItem: function() {},
+  removeItem: function() {},
+  clear: function() {},
+  key: function() { return null; },
+  length: 0,
+} as Storage;