Refactor JourneyCard for improved flexibility and accessibility

[ksharma-xyz]

Refactor JourneyCard for improved flexibility and accessibility

This PR refactors the JourneyCard component to enhance its flexibility and accessibility. Key changes include:

• Replace Row with FlowRow for responsiveness
• Separate departure time and location text
• Add origin and destination time text
• Improve text styling and color consistency
• Enhance layout for better readability at different font scales
• Update TimeTableScreen to use the new JourneyCard structure
• Improve null safety in TripResponseMapper

Screenshots

Testing Notes

• Verify that the JourneyCard displays correctly at different font scales
• Ensure that the TimeTableScreen functions properly with the updated JourneyCard
• Check that the TripResponseMapper handles null values appropriately

[ksharma-xyz]

• Refactor JourneyCard for improved flexibility and accessibility #181 👈
• Create constants #179
• main

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