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Document the single-selection Brīdinājumi workflow

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@@ -85,7 +85,9 @@ Monda Regular and Bold are bundled locally and used by the interface and generat
### Brīdinājumi
Brīdinājumi renders the current LVĢMC warning polygons over the same `map_1920x1080`/`map_3840x1440` backgrounds used by Kartes, plus a production border-outline overlay drawn last so it stays crisp above the softened data layer. Warning severities are blurred and filled onto an offscreen layer before compositing, giving the broadcast graphic a feathered rather than hard-edged warning area.
Brīdinājumi renders the current LVĢMC warning polygons over the same `map_1920x1080`/`map_3840x1440` backgrounds used by Kartes, plus a production border-outline overlay drawn last so it stays crisp above the softened data layer. Warning severity is blurred and filled onto an offscreen layer before compositing, giving the broadcast graphic a feathered rather than hard-edged warning area.
The canvas always renders exactly one operator-selected warning, matching how these graphics are produced for air; there is no multi-warning composite and no on-canvas legend. The title is derived from the selected warning's phenomenon (`Brīdinājums: {phenomenon}`) but stays manually editable.
The backend returns warning polygons as raw latitude/longitude points; the frontend projects them to pixel space with a per-resolution affine transform (`x = a·lon + b·lat + c`, `y = d·lon + e·lat + f`). Each transform is a least-squares fit of well-spread Latvian cities' real-world coordinates against the pixel positions already validated for these same map backgrounds by Kartes/Faktiskā (`cityCoords.ts` + `mapConsts.ts`), rather than an independently eyeballed calibration. An earlier 4-corner bounding-box version of this projection could not represent the source artwork's rotation/shear and drifted up to ~200px on the 3840 canvas; the affine fit lands within ~35px.