[Task] Near Treasury - Optimize Transaction History data refresh interval

[rknearn-qa]

Background

Currently, the Dashboard → Transaction History section does not reflect new transactions immediately after they occur.
As confirmed during discussion with Megha (Nov 11, 2025), the backend currently fetches or syncs new data every ~5–15 minutes.

This delay causes users to believe their transactions are missing or failed until the data eventually appears.
Reducing the sync interval (e.g., from 5–15 minutes → 1–2 minutes → immediately) will significantly improve user experience and data reliability.

User Story

As a Near Treasury user,
I want the Transaction History to update automatically within 1–2 minutes (or 1-5 sec) after each on-chain transaction,
so that I can verify recent activity quickly and trust that my dashboard reflects real-time account status.

Acceptance Criteria

• Transaction History automatically refreshes or syncs within 1–2 minutes of a new transaction.
• Reduce or optimize the backend polling / sync interval responsible for fetching transaction logs.
• The latest transactions appear in the Dashboard and Transaction History without requiring manual page reload.
• Ensure updated interval doesn’t cause excessive backend or RPC load.
• Verify correct update behavior for all transaction types (NEAR Intents tokens, DAO transfers).
• Confirm UX improvement with QA — no visible delay longer than 2 minutes.

Resources & Additional Notes