fix: embed sources in emitted sourcemaps

[raashish1601]

Summary

Fixes #3147.

This updates the shared TypeScript build configuration to emit sourcesContent in generated source maps. The current generated maps include paths like ../index.ts, but the published package does not include those source files, so debugger tooling cannot resolve the original TypeScript sources from the installed package alone.

Validation

• .\node_modules\.bin\tsc.cmd --build packages/client --force --verbose
• Inspected packages/client/dist/index.js.map and confirmed sourcesContent is present
• npm run build
• npm run lint:changed
• git diff --check

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Note

Low Risk
Low risk configuration change that only affects TypeScript build outputs by embedding sourcesContent in generated source maps.

Overview
Enables debuggers to resolve original TypeScript sources from installed packages by setting inlineSources: true in tsconfig.base.json, causing generated .map files to include sourcesContent.

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