UI: Add mode selection filter to TimeTableScreen

[ksharma-xyz]

TL;DR

Added mode selection functionality to the trip planner timetable screen with a new confirmation button.

What changed?

• Added a new ModeSelectionChanged event to handle transport mode filtering
• Created a new check icon resource for the confirmation button
• Implemented a "Done" button in the mode selection row that appears when filtering transport modes
• Added handling for mode selection changes in the ViewModel
• Extended the TimeTableScreen to support mode selection callbacks

How to test?

1. Navigate to the timetable screen
2. Click the filter button to show transport mode options
3. Select/deselect different transport modes
4. Click the "Done" button to confirm your selection
5. Verify that the mode selection is reflected in the UI and the selection row closes

Why make this change?

To provide users with the ability to filter their journey results by transport modes, making it easier to find preferred travel options. The confirmation button ensures users can review their selections before applying the filter.

[ksharma-xyz]

• UI: Add transport mode filtering to trip planner #609
• UI: Add mode selection filter to TimeTableScreen #608 👈 (View in Graphite)
• UI: Add transport mode filtering to TimeTableScreen #607
• UI: Add stable keys and fix loading emoji animation #605 : 1 other dependent PR (#606 )
• UI: Update light rail color and chip text contrast #604
• UI: Update TransportModeChip text color and border styling #603
• UI: Add transport mode selection row to TimeTableScreen #602
• UI: Add filter button to TimeTableScreen #601
• main

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[ksharma-xyz]

Merge activity

• Feb 12, 8:31 AM EST: Graphite rebased this pull request after merging its parent, because this pull request is set to merge when ready.