Core: Replace println/Timber with unified logging system

[ksharma-xyz]

TL;DR

Replaced all println and Timber logging calls with a unified log function from the core module.

What changed?

• Replaced all instances of println debugging statements with log function calls
• Removed Timber logging dependencies and replaced with log function
• Updated logging calls across trip planner, GTFS, and UI components
• Standardized error logging format
• Added imports for the new logging utility

How to test?

1. Run the app and verify logging output appears correctly
2. Check debug logs in various scenarios:
   • Search for stops
   • View timetables
   • Save trips
   • Download GTFS data
3. Verify error messages are properly logged during failure cases

Why make this change?

Centralizing logging through a single utility function provides:

• Consistent logging format across the codebase
• Better control over logging output
• Easier debugging and log filtering
• Removal of Android-specific Timber dependency for better multiplatform support

[ksharma-xyz]

• Release: Bump version codes for Android and iOS #469
• Analytics: Add stop selection and field click events #468
• Core: Rename AppPlatformType to DevicePlatformType and refactor AppInfo #466
• Analytics: Add app start event tracking #465
• Core: Add debug-only logging #473
• Core: Replace println/Timber with unified logging system #472 👈 (View in Graphite)
• Core: Add multiplatform logging module #471
• main

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[ksharma-xyz]

Merge activity

• Dec 22, 4:11 PM EST: Graphite disabled "merge when ready" on this PR due to: a merge conflict with the target branch; resolve the conflict and try again..