Fix browser tests to use pre-built dist files

The browser tests were failing because Karma was trying to load individual
TypeScript source files, which import with .js extensions that don't exist
as separate files (they're now .ts files).

Changes:
- Updated test/unit/asyncImportHelper.js to import from /base/dist/jspdf.es.js
  instead of /base/src/index.ts
- Simplified test/unit/karma.conf.js to serve the pre-built dist files
- Removed unnecessary TypeScript preprocessing from karma config since we're
  using the already-compiled dist files

This approach is cleaner because:
1. It matches how users will actually consume the library
2. It avoids complex on-the-fly TypeScript transpilation in the browser
3. It eliminates 404 errors for .js files that don't exist
4. It ensures tests run against the actual built artifacts

The build must be run before tests (which CI already does), and browser
tests will now use the production ES module build.

Author: claude

dist/jspdf.es.js

@@ -1,8 +1,8 @@
 /** @license
  *
  * jsPDF - PDF Document creation from JavaScript
- * Version 3.0.3 Built on 2025-11-09T19:40:29.937Z
- *                      CommitID 28b15316e4
+ * Version 3.0.3 Built on 2025-11-09T19:51:50.170Z
+ *                      CommitID 9b9941edcc
  *
  * Copyright (c) 2010-2025 James Hall <[email protected]>, https://github.com/MrRio/jsPDF
  *               2015-2025 yWorks GmbH, http://www.yworks.com

dist/jspdf.es.min.js

@@ -1,8 +1,8 @@
 /** @license
  *
  * jsPDF - PDF Document creation from JavaScript
- * Version 3.0.3 Built on 2025-11-09T19:40:29.976Z
- *                      CommitID 28b15316e4
+ * Version 3.0.3 Built on 2025-11-09T19:51:50.204Z
+ *                      CommitID 9b9941edcc
  *
  * Copyright (c) 2010-2025 James Hall <[email protected]>, https://github.com/MrRio/jsPDF
  *               2015-2025 yWorks GmbH, http://www.yworks.com

dist/jspdf.node.js

@@ -1,8 +1,8 @@
 /** @license
  *
  * jsPDF - PDF Document creation from JavaScript
- * Version 3.0.3 Built on 2025-11-09T19:40:29.899Z
- *                      CommitID 28b15316e4
+ * Version 3.0.3 Built on 2025-11-09T19:51:50.135Z
+ *                      CommitID 9b9941edcc
  *
  * Copyright (c) 2010-2025 James Hall <[email protected]>, https://github.com/MrRio/jsPDF
  *               2015-2025 yWorks GmbH, http://www.yworks.com

dist/jspdf.node.min.js

@@ -12,7 +12,7 @@ import {
   AcroFormTextField,
   AcroFormPasswordField,
   AcroFormAppearance
-} from "/base/src/index.ts";
+} from "/base/dist/jspdf.es.js";
 
 window.importsReady({
   jsPDF,

dist/jspdf.umd.js

@@ -1,8 +1,6 @@
 // Karma configuration
 "use strict";
 const karmaConfig = require("../karma.common.conf.js");
-const resolve = require("rollup-plugin-node-resolve");
-const typescript = require("@rollup/plugin-typescript");
 
 module.exports = config => {
   config.set({
@@ -17,7 +15,8 @@ module.exports = config => {
         watched: true,
         type: "module"
       },
-      { pattern: "src/**/*.ts", included: false },
+      { pattern: "dist/jspdf.es.js", included: false },
+      { pattern: "dist/jspdf.es.js.map", included: false },
       "node_modules/canvg/lib/umd.js",
       "node_modules/html2canvas/dist/html2canvas.js",
       "node_modules/dompurify/dist/purify.js",
@@ -37,18 +36,6 @@ module.exports = config => {
         served: true
       }
     ],
-    preprocessors: {
-      "src/libs/fflate.ts": ["rollup"],
-      "src/libs/fast-png.ts": ["rollup"]
-    },
-
-    rollupPreprocessor: {
-      plugins: [typescript({ tsconfig: "./tsconfig.json" }), resolve()],
-      output: {
-        format: "es",
-        sourcemap: "inline"
-      }
-    },
 
     browsers: ["ChromeHeadless"],
     // test results reporter to use