[test] Add unit tests for useTableState in @termuijs/widgets

[pranvxag]

What problem does this solve?

packages/widgets/src/data/TableState.ts exports useTableState — a state
hook managing row data and scroll offset for the Table widget. It has
no test file despite containing boundary logic in setRows, scrollPrev,
and scrollNext that could silently regress.

Proposed solution

Create packages/widgets/src/data/TableState.test.ts covering:

• useTableState initializes with provided rows
• useTableState initializes scrollOffset to 0
• setRows() updates rows
• setRows() clamps scrollOffset when new rows list is shorter
• setRows() keeps scrollOffset when still valid
• setRows() handles empty rows and resets scrollOffset to 0
• scrollNext() increments scrollOffset
• scrollPrev() decrements scrollOffset
• scrollPrev() does not go below 0

Which package would this belong in?

@termuijs/widgets — packages/widgets/src/data/TableState.test.ts

GSSoC contributor?

• Yes. You contribute under GSSoC 2026 and want to work on this.
• No. You are filing a suggestion.

[github-actions]

✅ Auto-assigned to @pranvxag (issue opener).

Open your PR by 2026-06-29 (7 days). The bot frees this issue for another contributor after that date.

Reminders:

• ⭐ Star the repo first. The star-check job blocks your merge otherwise.
• PR title: type: short description
• Link this issue in your PR body: Closes #1752

Good luck. 🚀