fix(tui): replace ink-use-stdout-dimensions with inline hook — ESM compat

[umyunsang]

Summary

• Remove ink-use-stdout-dimensions package (CJS, incompatible with Ink v5 ESM)
• Replace with inline useColumns() hook using useStdout() + stdout.on('resize') — identical logic

Root cause

ink-use-stdout-dimensions is built as CJS and calls require('ink'), but Ink v5 is ESM-only with top-level await → runtime crash on govon startup.

Test plan

• govon starts without ESM error
• Terminal resize reflows markdown content correctly

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• packages/npm/package.json
• packages/npm/src/components/MarkdownView.tsx

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