Bug fixes and some enhancements

Overview

Focus on flexible destination filtering, post-setup editing, richer sensor metadata, and earlier + clearer stop lookup service availability.

Changes

✨ New

• Destination (substring) filter replaces numeric direction selector; key name direction kept for backward compatibility.
• Options Flow: Edit line filter, destination filter, time window, refresh interval after setup. #4
• Stop lookup service available without sensors (add empty trafiklab: YAML stub to load early).
• last_update attribute on sensor (UTC ISO8601).
• Enhanced list: minutes_until, delay_minutes, formatted time, platform fallback.

🔧 Changes

• Config entry version 2: mutable keys moved from [data] → [options] (auto-migrated).
• Sensor titles capitalized (“Departures” / “Arrivals”).
• Logging tagged [Trafiklab] for service + setup diagnostics.
• Optional trafiklab: CONFIG_SCHEMA added for early load.

🐞 Fixes

• Destination (formerly direction) filtering now applied reliably #3
• Removed duplicate constant definitions.
• Refactored sensor/coordinator to eliminate structural/indent issues.
• Service registers even before first config entry (early + late startup paths).
• Unique ID generation improved to avoid clashes when filters differ.

🔄 Migration / Compatibility

• Automatic migration; no manual action.
• Old direction numeric values remain as plain strings; now treated as free-text (still accepted).
• To mimic old “both directions”, just leave destination filter empty.

🚀 Upgrade Steps

• Update files / pull via HACS.
• Restart Home Assistant.