[Feature] Add simple travel history tab

[mattekudacy]

Description

Add a minimal travel history feature showing past journeys.

User Story

As a commuter, I want to see my past trips so I can track my commute patterns.

Proposed Design

Simple card-based display:

┌─────────────────────────────┐
│ 📍 Your last trip: │
│ │
│ Ayala → Monumento │
│ ~48 minutes │
│ Dec 23, 2025 │
└─────────────────────────────┘

Data to Store (per trip)

• Origin station
• Destination station
• Duration (minutes)
• Date/time
• Direction (Northbound/Southbound)

Acceptance Criteria

• History stored locally using SharedPreferences or local DB
• Display last 10-20 trips max
• Minimal UI - just simple cards
• Clear history option in settings

Technical Notes

• Consider using sqflite or hive for local storage
• Keep it lightweight - no complex analytics