Feat/enhanced UI components

[Pressergrey]

Description

This pull request addresses several UI and functionality enhancements across the frontend, resolving multiple open issues on a single branch.

Key Enhancements:

1. Credential Detail Page: Upgraded the credential view to prominently display the credential ID, completion score, and the on-chain transaction hash for straightforward verification.
2. Reward Claim Dialog: Added a confirmation modal prior to claiming rewards to surface transaction fees and prevent accidental submissions.
3. Wallet Connection Handling: Refined the useAuth hook with detailed wallet error detection (e.g., Freighter missing, connection denied, wrong network, timeouts) alongside actionable resolution steps.
4. Profile Settings: Completed the dedicated /settings page implementation for managing user display preferences, learning goals, and language options.

Related Issues

Closes #237
Closes #238
Closes #239
Closes #240

Changes Made

• Credentials: Modified src/app/credentials/[credentialId]/page.tsx and updated the CredentialNFT type in src/types/stellar.ts.
• Rewards: Hooked up the RewardClaimDialog in src/components/rewards/claim-button.tsx.
• Authentication: Integrated error classification logic into src/lib/hooks/use-auth.ts.
• Settings: Integrated the user settings interface at src/app/settings/page.tsx.

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