feat(card): square map view & configurable flight list position

[Springvar]

Summary

Adds a square map view option and a configurable flight list position, and fixes the pre-existing tsc / lint failures so they pass cleanly.

Features

• radar.view: 'radar' | 'map' (default radar)
  • map renders a full-bleed square Leaflet map instead of the circular radar screen — better for fullscreen and multi-column layouts.
  • Automatically falls back to system tiles when no background_map is chosen.
  • New radar.rings setting to control radar grid rings/bearing lines (default off in map view, on in radar view; overridable).
• list.position: 'below' | 'left' | 'right' (default below)
  • Places the flight list beside the radar/map on wide cards.
  • Falls back to below automatically when the card is too narrow (< ~560px) via CSS container queries — adapts dynamically, no config changes.

Fixes (pre-existing)

• Typecheck errors down from 11 → 0 (missing invalidateSize, _currentMapConfig, LeafletMapOptions.zoomSnap, editor aircraft-marker indexing, browser test cast, vitest.browser.config.ts launch→launchOptions).
• Lint errors down from 24 → 0 (excluded the generated build bundle from linting).
• New editor UI for all the above options + README docs.

Verification

• tsc --noEmit: 0 errors
• eslint .: 0 errors
• vitest run: 196 tests pass
• vite build: succeeds