build(cutover): the ui cli build drops sourcesContent through the shared tsup hook (bill item 45, objectstack#25803)

ui/packages/cli/tsup.config.ts sets `sourcemap: true` without the shared
`esbuildOptions: dropSourcesContent` hook (scripts/tsup-drop-sources-content.mjs,
the pin for #16469), so on the merged tree check:sourcemap-no-sources-content
refused its two dist maps for embedding the original source text. The
vscode-extension config has the same shape but is private, so the sweep does
not read it. Measured: rebuild + gate -> 64 built packages, 590 maps, none
embed source text.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RSDL3SFtJaKzcymvCD8RsU

Author: claude

ui/packages/cli/tsup.config.ts

@@ -8,6 +8,8 @@
 
 import { defineConfig } from 'tsup';
 
+import { dropSourcesContent } from '../../../scripts/tsup-drop-sources-content.mjs';
+
 export default defineConfig({
   entry: {
     cli: 'src/cli.ts',
@@ -18,4 +20,5 @@ export default defineConfig({
   clean: true,
   sourcemap: true,
   shims: false,
+  esbuildOptions: dropSourcesContent,
 });