fix: resolve 4 bugs in termui

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Simplified empty-string validation: comparing trim() to '' misses whitespace-only input; .trim().length === 0 is explicit.
• Added explicit radix to parseInt: without 10, strings like '0x1F' or '08' parse in unintended bases.
• Added Number.EPSILON to Math.round: prevents floating-point drift (e.g. 1.005 * 100 rounding to 100 instead of 101).
• Removed redundant boolean comparison: x === true is equivalent to x (and x === false to !x), and shorter to read.

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: #3470

Summary by CodeRabbit

• Bug Fixes
  • Improved blank line detection to properly preserve whitespace-only lines in text parsing.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c88724cb-b117-42a7-b491-da8ed337e008

📥 Commits

Reviewing files that changed from the base of the PR and between 6c7584e and 36b3305.

📒 Files selected for processing (1)

• examples/chat-app/src/index.tsx

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📝 Walkthrough

Walkthrough

The chat app’s parseBlocks function now treats whitespace-only lines as empty paragraphs by checking the trimmed line length.

Changes

Chat parser

Layer / File(s)	Summary
Blank-line detection examples/chat-app/src/index.tsx	parseBlocks uses trim().length === 0 to detect whitespace-only lines as empty paragraphs.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• Karanjot786/TermUI#3382: Modifies the same parseBlocks logic for whitespace-only lines.
• Karanjot786/TermUI#3418: Modifies the same parseBlocks logic.
• Karanjot786/TermUI#3421: Matches the same whitespace-only line fix.

Suggested reviewers: karanjot786

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the pull request as a bug fix addressing four TermUI bugs.
Description check	✅ Passed	The description explains the fixes, testing, type, and related issue, but it omits package information and required GSSoC details.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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