Replace grey line composer with photo and scaled baseline

[peterwolf-pl]

Summary

• Swap grey wierszownik placeholder for external wierszownik.jpg image.
• Compute baseline 340px from right and 240px from bottom with dynamic scaling.
• Scale letters and drag ghost using new image-based measurements.
• Apply tiled assets/bg.png background with configurable tile size and fallback #d4d4d4 color.
• Double letter size while dragging and on wierszownik for better visibility.
• Use light gray #d4d4d4 page backgrounds across compositing and printing modules.
• Remove committed assets/bg.png binary; supply tiles and wierszownik.jpg manually.
• Drop leftover sample files LetterComposer copy.jsx and aApp.jsx.

Testing

• npm test (fails: Could not read package.json)

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https://chatgpt.com/codex/tasks/task_e_68b54071cee483209f231f8163136808