fix: restore test assertions and add hanbi type declarations

- Restore dev-server-rollup test files to master versions: the sed
  import rewrite incorrectly changed assertion strings like
  "import moduleA from './module-a-stub.js'" to use .ts extensions.
  Only actual import statements should use .ts extensions.
- Add hanbi.d.ts ambient declarations for packages that use hanbi
  in tests (dev-server-core, dev-server-hmr, dev-server-import-maps,
  test-runner-core). With module:nodenext, untyped CJS modules need
  explicit declarations.

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

packages/dev-server-core/test/hanbi.d.ts

@@ -0,0 +1 @@
+declare module 'hanbi';

packages/dev-server-hmr/test/hanbi.d.ts

@@ -0,0 +1 @@
+declare module 'hanbi';

packages/dev-server-import-maps/test/hanbi.d.ts

@@ -0,0 +1 @@
+declare module 'hanbi';

packages/dev-server-rollup/test/node/plugins/alias.test.ts

@@ -19,7 +19,7 @@ describe('@rollup/plugin-alias', () => {
 
     try {
       const text = await fetchText(`${host}/app.js`);
-      expectIncludes(text, "import moduleA from './module-a-stub.ts'");
+      expectIncludes(text, "import moduleA from './module-a-stub.js'");
     } finally {
       server.stop();
     }

packages/dev-server-rollup/test/node/plugins/node-resolve.test.ts

@@ -17,7 +17,7 @@ describe('@rollup/plugin-node-resolve', () => {
 
     try {
       const text = await fetchText(`${host}/app.js`);
-      expectIncludes(text, "import moduleA from './node_modules/module-a/index.ts'");
+      expectIncludes(text, "import moduleA from './node_modules/module-a/index.js'");
     } finally {
       server.stop();
     }

packages/dev-server-rollup/test/node/plugins/postcss.test.ts

@@ -49,7 +49,7 @@ html {
       expectIncludes(text, 'export default');
       expectIncludes(
         text,
-        "import styleInject from './node_modules/style-inject/dist/style-inject.es.ts';",
+        "import styleInject from './node_modules/style-inject/dist/style-inject.es.js';",
       );
       expectIncludes(text, 'styleInject(css_248z);');
     } finally {

packages/dev-server-rollup/test/node/rollupBundlePlugin.test.ts

@@ -47,17 +47,17 @@ describe('rollupBundlePlugin', () => {
 
     try {
       const textA1 = await fetchText(`${host}/a1.js`);
-      expectIncludes(textA1, "import { b as bc, d } from './__rollup-generated__d.ts';");
+      expectIncludes(textA1, "import { b as bc, d } from './__rollup-generated__d.js';");
       expectIncludes(textA1, 'var a1 = `a ${bc} ${d}`;');
       expectIncludes(textA1, 'export { a1 as default };');
 
       const textA2 = await fetchText(`${host}/a2.js`);
-      expectIncludes(textA2, "import { b as bc, d } from './__rollup-generated__d.ts';");
+      expectIncludes(textA2, "import { b as bc, d } from './__rollup-generated__d.js';");
       expectIncludes(textA2, 'var a2 = `a ${bc} ${d}`;');
       expectIncludes(textA2, 'export { a2 as default };');
 
       const textA3 = await fetchText(`${host}/a3.js`);
-      expectIncludes(textA3, "import { b as bc, d } from './__rollup-generated__d.ts';");
+      expectIncludes(textA3, "import { b as bc, d } from './__rollup-generated__d.js';");
       expectIncludes(textA3, 'var a3 = `a ${bc} ${d}`;');
       expectIncludes(textA3, 'export { a3 as default };');
 
@@ -85,7 +85,7 @@ describe('rollupBundlePlugin', () => {
 
     try {
       const text = await fetchText(`${host}/not-bundled.js`);
-      expectIncludes(text, "import a from './a.ts';");
+      expectIncludes(text, "import a from './a.js';");
       expectIncludes(text, 'export default `not bundled ${a}`;');
     } finally {
       server.stop();

packages/dev-server-rollup/test/node/unit.test.ts

@@ -77,7 +77,7 @@ describe('@web/dev-server-rollup', () => {
 
       try {
         const text = await fetchText(`${host}/app.js`);
-        expectIncludes(text, "import moduleA from './src/foo.ts'");
+        expectIncludes(text, "import moduleA from './src/foo.js'");
       } finally {
         server.stop();
       }

packages/test-runner-core/test/hanbi.d.ts

@@ -0,0 +1 @@
+declare module 'hanbi';