fix: replace unstable list keys and fix burn page build errors

[temisan0x]

Closes #215

Summary

Replaces unstable React list keys across affected components and resolves build-breaking issues in the Burn page discovered during implementation.

What changed

Stable key fixes

• Added unique id values for FAQ items in app/help/page.tsx
• Replaced index-based keys in signup password strength indicators
• Updated field.tsx, skeleton-list.tsx, and slider.tsx to avoid key={index}
• Confirmed rates/page.tsx and mint/page.tsx already use stable identifiers

Burn page fixes

• Fixed broken JSX structure from unmatched tags
• Replaced invalid values references with form.getValues()
• Corrected submit handler from formHandleSubmit to form.handleSubmit

Verification

• Removed unstable key={index} usage in affected files
• tsc --noEmit passes
• Burn page now builds successfully without JSX/TS errors

Testing

• Confirmed FAQ and rate card rendering remains stable
• Verified Burn page form loads and submits correctly

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[Junman140]

@temisan0x resolve conflicts

[temisan0x]

Fixed the conflicts and synced everything with the latest main. Also cleaned up the package-lock and double-checked the burn page logic so it’s all good to go now. Ready for review whenever you're free! @Junman140

[Junman140]

@temisan0x it still has two

[temisan0x]

Resolved all conflicts with upstream/main, confirmed no key={index} across the app. Also caught and fixed one in help/page.tsx. Ready for review. @Junman140