fix: resolve 4 bugs in TourEase

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Replaced innerHTML assignment with textContent: prevents HTML injection / XSS and is faster since it does not parse markup.
• Added rejection handler to Promise.all: an unhandled rejection in any input promise previously crashed silently.
• Replaced arr[arr.length - 1] with .at(-1): cleaner access to the last element.
• 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: #867

[vercel]

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