fix(cli): toggle export checkboxes on click

[mturac]

Summary

• toggle export dialog checkbox values when their rows are clicked
• keep keyboard space toggling behavior unchanged
• add a source contract test for the row-click wiring

Fixes #10305

Validation

• bun test tests/unit/export-dialog-contract.test.ts
• bunx prettier --check packages/opencode/src/cli/cmd/tui/ui/dialog-export-options.tsx packages/kilo-vscode/tests/unit/export-dialog-contract.test.ts .changeset/export-checkbox-click.md
• git diff --check
• bun run typecheck
• pre-push bun turbo typecheck

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/export-checkbox-click.md
• packages/kilo-vscode/tests/unit/export-dialog-contract.test.ts
• packages/opencode/src/cli/cmd/tui/ui/dialog-export-options.tsx

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_{Reviewed by ember-alpha · 246,581 tokens}

[IamCoder18]

This was also resolved in #10306