feat(stellar): add transaction history for wallet activities

[shadrach68]

closes #85
Add Transaction History for Wallet Activities

Description

This PR implements a backend service and frontend UI to track and display blockchain-related wallet activities. The system maintains a secure, queryable log of all actions associated with a connected Stellar wallet, providing users with a clear, paginated view of their activity to ensure transparency.

Related Issue

fixes #85

Type of Change

• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change
• Documentation update

Changes Made

• Database: Created the transactions table and added database functions (createTransaction, getTransactionsByWallet) to track logs.
• API: Implemented GET and POST at /api/transactions with built-in pagination and error handling.
• Frontend UI: Built the app/transactions/page.tsx page to display the user's wallet activity cleanly.
• Action Logging: Integrated automatic logging for:
  • Wallet connections (Freighter & Albedo).
  • Snippet updates and deletions.
  • Snippet version restorations.
• Navigation: Added the "Activity" link to the main navigation bar.

Testing

How to test these changes:

1. Ensure your local database has the new table by running the scripts/add-transactions.sql migration.
2. Connect your wallet via the navbar "Connect Wallet" button.
3. Navigate to the newly added Activity tab in the navbar.
4. Verify the initial wallet_connect transaction appears.
5. Edit, delete, or restore a snippet, and check the Activity page to ensure the new actions are logged and displayed correctly.

Database Migration Required

Before testing, run the following SQL in your Neon database:

CREATE TABLE IF NOT EXISTS transactions (
  id UUID PRIMARY KEY,
  wallet_address VARCHAR(255) NOT NULL,
  type VARCHAR(100) NOT NULL,
  description TEXT,
  metadata JSONB,
  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_transactions_wallet_address ON transactions(wallet_address, created_at DESC);

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[SudiptaPaul-31]

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