Feat/app

[techgirly77]

Completed! ✅

Implemented a reusable timestamp formatting utility to ensure blockchain event timestamps are handled consistently throughout the NotifyChain dashboard.

Changes Made

• Created a shared timestamp formatting utility for event-related timestamps.
• Added consistent human-readable date/time formatting.
• Added safe handling for missing, malformed, or invalid timestamp values.
• Standardized timezone handling across event-related components.
• Replaced duplicated timestamp formatting logic with the shared utility.
• Added unit tests covering valid, missing, and invalid timestamp values.

Validation

• ✅ Reusable timestamp utility implemented.
• ✅ Event-related UI components use the shared utility.
• ✅ Invalid timestamps are handled gracefully.
• ✅ Unit tests cover valid and invalid timestamp inputs.
• ✅ Existing event behavior remains unchanged.

closes #603

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