[Feature] Auto-stop tracking when destination is reached

[mattekudacy]

Description

Automatically stop tracking when the user reaches their destination and save the trip to history.

User Story

As a commuter, I want the app to automatically stop when I arrive so I don't have to manually end the session.

Proposed Behavior

1. User arrives at destination station
2. App detects arrival and shows notification
3. After staying at/near the station for 30-60 seconds:
   • Tracking automatically stops
   • Trip is saved to history
   • Summary screen shown

Flow

[Destination Reached]
↓
[Wait 30-60 seconds to confirm]
↓
[Auto-stop tracking]
↓
[Save to history]
↓
[Show trip summary]

┌─────────────────────────────┐
│ 🎉 You've arrived!                                             │
│                                                                            │ 
│ Ayala → Monumento                                         │
│ Duration: 48 min                                                │
│                                                                            │
│ [Done] [Track New Trip]                                      │
└─────────────────────────────┘

Acceptance Criteria

• Detect arrival at destination
• Wait confirmation period (30-60 sec near station)
• Auto-stop tracking
• Save trip to history (connects to [Feature] Add simple travel history tab #3)
• Show trip summary
• Option to start new trip immediately

Dependencies

• Requires [Feature] Add simple travel history tab #3 (Travel History) to be implemented first