feat: add seat extras

[darioackermann]

For det første: Tak for dette utroligt nyttige tip!

What problem does this solve?

Allows users to track any extras that comes with their seat.
For me as a tall person, this is primarily useful to track how often I managed to get a (free) extra legroom and/or emergency exit seat.

What does this MR do?

• Adds a new field seatExtras, defaulting to []
  • Multiple tags can be selected at once
• Adds a PieChart for those
• Extends tests accordingly

Screenshots

Feedback needed

• The current tags are a suggestion. Let me know if one is missing or should be removed from the list.

AI-Disclaimer: AI assisted in this MR. I have manually reviewed and verified suggestions where applicable.

Note

Add seat extras field to flight seat records with statistics and form support

• Adds a seatExtras string array field to the seat table via a new Prisma migration, with a default of [].
• Extends the seat information form in SeatInformation.svelte with toggle buttons for selecting multiple extras per seat.
• Adds a 'Seat Extras' pie chart to the statistics modal and implements the full aggregation and filter-matching logic in aggregations.ts.
• Updates all import processors (AITA, ByAir, Flighty, FR24, JetLog, OpenFlights, TripIt, etc.) to include seatExtras: [] on imported seats.

^{Macroscope summarized aad157e.}

[github-actions]

Label error. Requires exactly 1 of: changelog:.*. Found: Web

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.6% Duplication on New Code

See analysis details on SonarQube Cloud

[evanrich]

can we also add "empty row" or "extra seat" to this? some flights offer, for an extra fee, a guaranteed seat, meaning that you can either have an empty seat next to you (I guess technically you could do this buy clicking the "add seat" option today), or if it's you and another person, an entire row to yourself.

[evanrich]

boarding group might be an option too?

[johanohly]

Thanks for the contribution! I ended up solving this more generally in #679 by adding per-passenger custom fields, including multi-select fields. That covers seat extras without baking a fixed list into AirTrail, so I'm closing this in favor of that approach.