Aircraft profiles (multiple types: TAS, burn, climb/descent)

[msupino]

Summary

Support multiple aircraft profiles instead of the single global GPH/taxi pair. Each profile: name, cruise TAS, GPH, taxi/T.O. gal, climb/descent rates, usable fuel.

Motivation

Pilots fly different types; re-entering performance each time is error-prone. Profiles also feed wind/TAS (#wind) and reserves (#fuel).

Proposed UI

• Profile picker in the Flight Plan modal; manage (add/edit/delete) profiles.
• Selecting a profile fills speed/burn defaults for new legs.

Implementation

• docs/app/core.js / io.js — navaid.aircraftProfiles (array) + navaid.aircraftActive; migrate existing navaid.aircraft.
• Strings (en + he).

Acceptance criteria

• Create/edit/delete/select profiles; persisted.
• Existing single-aircraft settings migrate into a default profile.
• Active profile drives defaults.
• en + he strings.