feat: add reusable undo and redo history manager

[jainiksha]

Description

Summary

This PR introduces a reusable History manager for TermUI core, providing undo and redo functionality with configurable history limits.

Changes Made

• Added a generic History<T> class.
• Added createHistory() helper API.
• Implemented undo and redo operations.
• Added configurable maximum history size.
• Exported the History API through the core public index.

Why

Many interactive terminal applications require undo and redo functionality. A shared history manager reduces boilerplate, provides a consistent API, and simplifies state management across TermUI applications.

Closes #1990

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: d78dde26-f047-404d-8a9c-a0f48ddd3304

📥 Commits

Reviewing files that changed from the base of the PR and between 5f479e6 and 543c36c.

📒 Files selected for processing (7)

• packages/core/src/history.ts
• packages/core/src/index.ts
• packages/widgets/src/display/Breadcrumbs.ts
• packages/widgets/src/index.ts
• packages/widgets/src/input/TextInput.ts
• packages/widgets/src/layout/Workspace.test.ts
• packages/widgets/src/layout/Workspace.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Hi @jainiksha 👋

⭐ Star this repo before your PR merges.

Why? GSSoC 2026 contributors who star get priority review and points credit. After you star, push any commit (or re-run this check). The needs-star label lifts automatically.

Thanks for your contribution to TermUI.