fix: use inline sourcemaps for dynamic loader to avoid external path error

The esbuild loader was configured with 'external' sourcemaps but also
'write: false', which causes an error since external sourcemaps need
an output path. Changed to 'inline' sourcemaps which work correctly
with in-memory builds.

This fixes the 'Cannot use an external source map without an output path'
error when loading TypeScript/JSX files dynamically.

Author: johnlindquist

src/build/loader.ts

@@ -55,7 +55,7 @@ export async function JSXLoad(url) {
     packages: "external",
     charset: "utf8",
     write: false,
-    sourcemap: 'external', // Generate external sourcemaps for better debugging
+    sourcemap: 'inline', // Use inline sourcemaps since we're not writing to disk
     tsconfigRaw: {
       compilerOptions: {
         target: "esnext",