fix: resolve 4 bugs in termui

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Removed redundant boolean comparison: x === true is equivalent to x (and x === false to !x), and shorter to read.
• Replaced global isNaN with Number.isNaN: the global version coerces its argument, so isNaN('1') returns false while Number.isNaN is strict.
• Fixed default sort: .sort() coerces elements to strings, so [10, 9, 2] sorts as [10, 2, 9]; numeric comparator sorts correctly.
• Added explicit radix to parseInt: without 10, strings like '0x1F' or '08' parse in unintended bases.

Type of Change

• Bug fix (non-breaking change fixing an issue)

How Has This Been Tested?

• Local manual testing

Checklist

• My code follows the style guidelines
• I have performed a self-review

Related Issue

Ref: #3543

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e8c7d9e0-2806-4b05-8b9b-c8b3c497325d

📥 Commits

Reviewing files that changed from the base of the PR and between 6c7584e and b51d21c.

📒 Files selected for processing (3)

• examples/rss-reader/src/index.tsx
• packages/ui/src/prompts.ts
• scripts/build-registry.ts

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