feat: implement batch UI enhancements (#340, #342, #343, #344)

[covenantalade]

Summary

This PR implements four frontend enhancements for the Agri-Fi platform, improving wallet error handling, input UX, profile navigation, and transaction transparency.

Proposed Changes

🛡️ Wallet Signature Error Handling (#340)

• Created errorHandling.utils.ts to detect user rejections across common wallet providers.
• Replaced generic trade failure messages in LandingPage.tsx with targeted copy for declined or failed signatures.

📝 Creator Bio Character Count (#342)

• Enhanced FormInput component with a showCharacterCount prop.
• Implemented a "warning" threshold that highlights the counter in amber when within 20 chars of the limit.
• Enabled character counting on the Creator Onboarding bio field (200-character limit).

📍 Sticky Profile Header (#343)

• Implemented a scroll-aware sticky header in CreatorProfileHeader.tsx.
• The header smoothly collapses as the user scrolls down, shrinking the avatar and typography to maintain visibility without occupying excessive screen space.
• Includes a background blur effect for better legibility against underlying content.

⛓️ Block Confirmation Labels (#344)

• Added transaction.utils.ts to map raw block counts to human-readable statuses:
  • 0: Pending
  • 1-5: Confirming
  • 6+: Confirmed
• Updated PendingTxModal.tsx to display these statuses via a color-coded Badge and a detailed confirmation count tooltip.

Verification

• Automated Tests: Ran pnpm test. Verified that CreatorBio.test.tsx and core interaction tests pass. (Note: Identified and confirmed that existing failures in utm.utils and numberFormat.utils are pre-existing baseline issues unrelated to these changes).
• Manual Review: Verified component structure and prop drilling for character counts and sticky state logic.

Closes #340
Closes #342
Closes #343
Closes #344

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