fix(core): treat 0 tty cols/rows as invalid

[remorses]

TTY streams can report terminal columns/rows as 0 even while isTTY is true.

CliRenderer currently uses nullish fallback (??) when assigning terminal dimensions, which preserves the invalid 0 values and can cascade into invalid buffer dimensions.

This change treats non-positive values as invalid and falls back to the renderer’s initial dimensions. No behavior change when columns/rows are already sane (> 0).

[pkg-pr-new]

@opentui/core

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@opentui/react

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@opentui/core-linux-arm64

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@opentui/core-linux-x64

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@opentui/core-win32-arm64

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@opentui/core-win32-x64

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commit: 3fe9871

[Copilot]

Pull request overview

Adjusts CliRenderer terminal dimension initialization to avoid propagating invalid 0 values for TTY size (notably observed in Bun-compiled binaries), preventing downstream invalid buffer sizing.

Changes:

• Treat non-positive stdout.columns / stdout.rows as invalid during CliRenderer construction.
• Fall back to the renderer’s initial width/height when terminal dimensions are missing or invalid.

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