fix: resolve 4 bugs in ChaatBazaar

[saurabhhhcodes]

Description

This PR fixes real bugs found in the codebase:

• Prevented interval leak: repeated mounts now clear the previous interval before scheduling a new one.
• Replaced innerHTML assignment with textContent: prevents HTML injection / XSS and is faster since it does not parse markup.
• Prevented interval leak: repeated mounts now clear the previous interval before scheduling a new one.
• Guarded JSON.parse on localStorage: corrupted or missing keys previously threw a fatal SyntaxError; now falls back safely.

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: #595