Fix symmetric padding in TUI input field

[opencode-agent[bot]]

Fixed. The change was straightforward:

File: packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx:752

Change: paddingRight={1} → paddingRight={2}

This makes the horizontal padding symmetric (2 on both left and right sides), so the cursor and text won't touch the right edge of the input box anymore.

Closes #6890

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