refactor: switch component exports from named to default

All 21 component files export exactly one class. Change to
export default so consumers can import them without named braces.
Update src/index.ts re-exports from "export *" to
"export { default as LeafletXxx }". Fix the two type-only
imports of LeafletLine to use default import syntax.

src/components/leaflet-circle-marker.ts

@@ -18,7 +18,7 @@ const PROPS = {
   fillOpacity: { kind: 'num', attr: 'fill-opacity', default: 0.2 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletCircleMarker extends withProps(HTMLElement, PROPS) {
+export default class LeafletCircleMarker extends withProps(HTMLElement, PROPS) {
   #obj?: CircleMarker;
 
   connectedCallback() {

src/components/leaflet-circle.ts

@@ -18,7 +18,7 @@ const PROPS = {
   fillOpacity: { kind: 'num', attr: 'fill-opacity', default: 0.2 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletCircle extends withProps(HTMLElement, PROPS) {
+export default class LeafletCircle extends withProps(HTMLElement, PROPS) {
   #obj?: Circle;
 
   connectedCallback() {

src/components/leaflet-control-attribution.ts

@@ -9,7 +9,7 @@ const PROPS = {
   prefix: { kind: 'str', attr: 'prefix', default: '' },
 } satisfies Record<string, PropDef>;
 
-export class LeafletControlAttribution extends withProps(HTMLElement, PROPS) {
+export default class LeafletControlAttribution extends withProps(HTMLElement, PROPS) {
   #obj?: Control.Attribution;
 
   connectedCallback() {

src/components/leaflet-control-scale.ts

@@ -12,7 +12,7 @@ const PROPS = {
   updateWhenIdle: { kind: 'bool-on', attr: 'update-when-idle' },
 } satisfies Record<string, PropDef>;
 
-export class LeafletControlScale extends withProps(HTMLElement, PROPS) {
+export default class LeafletControlScale extends withProps(HTMLElement, PROPS) {
   #obj?: Control.Scale;
 
   connectedCallback() {

src/components/leaflet-control-zoom.ts

@@ -12,7 +12,7 @@ const PROPS = {
   zoomOutTitle: { kind: 'str', attr: 'zoom-out-title', default: 'Zoom out' },
 } satisfies Record<string, PropDef>;
 
-export class LeafletControlZoom extends withProps(HTMLElement, PROPS) {
+export default class LeafletControlZoom extends withProps(HTMLElement, PROPS) {
   #obj?: Control.Zoom;
 
   connectedCallback() {

src/components/leaflet-feature-group.ts

@@ -2,7 +2,7 @@ import { FeatureGroup, Layer } from 'leaflet';
 import { buildOptions } from '../core/utils.ts';
 import { registerChildren, unregisterChildren, getChildren } from '../core/register.ts';
 
-export class LeafletFeatureGroup extends HTMLElement {
+export default class LeafletFeatureGroup extends HTMLElement {
   #obj?: FeatureGroup;
 
   static get observedAttributes() {

src/components/leaflet-geojson.ts

@@ -25,7 +25,7 @@ const PROP_BY_ATTR = new Map<string, string>(
   Object.entries(PROPS).map(([name, spec]) => [spec.attr, name]),
 );
 
-export class LeafletGeoJSON extends withProps(HTMLElement, PROPS) {
+export default class LeafletGeoJSON extends withProps(HTMLElement, PROPS) {
   #obj?: GeoJSON;
 
   connectedCallback() {

src/components/leaflet-image-overlay.ts

@@ -20,7 +20,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletImageOverlay extends withProps(HTMLElement, PROPS) {
+export default class LeafletImageOverlay extends withProps(HTMLElement, PROPS) {
   #obj?: ImageOverlay;
 
   connectedCallback() {

src/components/leaflet-layer-group.ts

@@ -2,7 +2,7 @@ import { LayerGroup, Layer } from 'leaflet';
 import { buildOptions } from '../core/utils.ts';
 import { registerChildren, unregisterChildren, getChildren } from '../core/register.ts';
 
-export class LeafletLayerGroup extends HTMLElement {
+export default class LeafletLayerGroup extends HTMLElement {
   #obj?: LayerGroup;
 
   static get observedAttributes() {

src/components/leaflet-line.ts

@@ -1,4 +1,4 @@
-export class LeafletLine extends HTMLElement {
+export default class LeafletLine extends HTMLElement {
   static get observedAttributes() {
     return ['lat', 'lng'];
   }

src/components/leaflet-map.ts

@@ -185,7 +185,7 @@ type PropTypes = {
 // runtime still extends HTMLElement, and no interface merge is required.
 const TypedBase = HTMLElement as unknown as new () => HTMLElement & PropTypes;
 
-export class LeafletMap extends TypedBase {
+export default class LeafletMap extends TypedBase {
   #map?: LMap;
   #container!: HTMLDivElement;
   #cssLink?: HTMLLinkElement;

src/components/leaflet-marker.ts

@@ -17,7 +17,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletMarker extends withProps(HTMLElement, PROPS) {
+export default class LeafletMarker extends withProps(HTMLElement, PROPS) {
   #obj?: Marker;
   #syncing = false;
 

src/components/leaflet-polygon.ts

@@ -5,7 +5,7 @@ import { withProps } from '../core/with-props.ts';
 import { registerChildren, unregisterChildren } from '../core/register.ts';
 import { isPathStyleAttr, updatePathStyle } from '../core/path-style.ts';
 import type { PropDef } from '../core/props.ts';
-import type { LeafletLine } from './leaflet-line.ts';
+import type LeafletLine from './leaflet-line.ts';
 
 const PROPS = {
   color: { kind: 'str', attr: 'color', default: '#3388ff' },
@@ -16,7 +16,7 @@ const PROPS = {
   fillOpacity: { kind: 'num', attr: 'fill-opacity', default: 0.2 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletPolygon extends withProps(HTMLElement, PROPS) {
+export default class LeafletPolygon extends withProps(HTMLElement, PROPS) {
   #obj?: Polygon;
   #observer?: MutationObserver;
 

src/components/leaflet-polyline.ts

@@ -5,7 +5,7 @@ import { withProps } from '../core/with-props.ts';
 import { registerChildren, unregisterChildren } from '../core/register.ts';
 import { isPathStyleAttr, updatePathStyle } from '../core/path-style.ts';
 import type { PropDef } from '../core/props.ts';
-import type { LeafletLine } from './leaflet-line.ts';
+import type LeafletLine from './leaflet-line.ts';
 
 const PROPS = {
   color: { kind: 'str', attr: 'color', default: '#3388ff' },
@@ -16,7 +16,7 @@ const PROPS = {
   fillOpacity: { kind: 'num', attr: 'fill-opacity', default: 0.2 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletPolyline extends withProps(HTMLElement, PROPS) {
+export default class LeafletPolyline extends withProps(HTMLElement, PROPS) {
   #obj?: Polyline;
   #observer?: MutationObserver;
 

src/components/leaflet-popup.ts

@@ -15,7 +15,7 @@ const PROPS = {
   autoClose: { kind: 'bool-on', attr: 'auto-close' },
 } satisfies Record<string, PropDef>;
 
-export class LeafletPopup extends withProps(HTMLElement, PROPS) {
+export default class LeafletPopup extends withProps(HTMLElement, PROPS) {
   #obj?: Popup;
   #observer?: MutationObserver;
 

src/components/leaflet-rectangle.ts

@@ -16,7 +16,7 @@ const PROPS = {
   fillOpacity: { kind: 'num', attr: 'fill-opacity', default: 0.2 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletRectangle extends withProps(HTMLElement, PROPS) {
+export default class LeafletRectangle extends withProps(HTMLElement, PROPS) {
   #obj?: Rectangle;
 
   connectedCallback() {

src/components/leaflet-svg-overlay.ts

@@ -17,7 +17,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletSVGOverlay extends withProps(HTMLElement, PROPS) {
+export default class LeafletSVGOverlay extends withProps(HTMLElement, PROPS) {
   #obj?: SVGOverlay;
 
   connectedCallback() {

src/components/leaflet-tile-layer-wms.ts

@@ -17,7 +17,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletTileLayerWMS extends withProps(HTMLElement, PROPS) {
+export default class LeafletTileLayerWMS extends withProps(HTMLElement, PROPS) {
   #obj?: TileLayer.WMS;
 
   connectedCallback() {

src/components/leaflet-tile-layer.ts

@@ -16,7 +16,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletTileLayer extends withProps(HTMLElement, PROPS) {
+export default class LeafletTileLayer extends withProps(HTMLElement, PROPS) {
   #obj?: TileLayer;
 
   connectedCallback() {

src/components/leaflet-tooltip.ts

@@ -16,7 +16,7 @@ const PROPS = {
   opacity: { kind: 'num', attr: 'opacity', default: 1.0 },
 } satisfies Record<string, PropDef>;
 
-export class LeafletTooltip extends withProps(HTMLElement, PROPS) {
+export default class LeafletTooltip extends withProps(HTMLElement, PROPS) {
   #obj?: Tooltip;
   #observer?: MutationObserver;
 

src/components/leaflet-video-overlay.ts

@@ -21,7 +21,7 @@ const PROPS = {
 
 const PROP_BY_ATTR = buildAttrMap(PROPS);
 
-export class LeafletVideoOverlay extends withProps(HTMLElement, PROPS) {
+export default class LeafletVideoOverlay extends withProps(HTMLElement, PROPS) {
   #obj?: VideoOverlay;
 
   connectedCallback() {

src/index.ts

@@ -3,24 +3,24 @@ export * from './core/with-props.ts';
 export * from './core/path-style.ts';
 export * from './core/register.ts';
 export * from './core/props.ts';
-export * from './components/leaflet-map.ts';
-export * from './components/leaflet-marker.ts';
-export * from './components/leaflet-circle.ts';
-export * from './components/leaflet-circle-marker.ts';
-export * from './components/leaflet-line.ts';
-export * from './components/leaflet-polygon.ts';
-export * from './components/leaflet-polyline.ts';
-export * from './components/leaflet-rectangle.ts';
-export * from './components/leaflet-tile-layer.ts';
-export * from './components/leaflet-tile-layer-wms.ts';
-export * from './components/leaflet-image-overlay.ts';
-export * from './components/leaflet-video-overlay.ts';
-export * from './components/leaflet-svg-overlay.ts';
-export * from './components/leaflet-layer-group.ts';
-export * from './components/leaflet-feature-group.ts';
-export * from './components/leaflet-geojson.ts';
-export * from './components/leaflet-control-zoom.ts';
-export * from './components/leaflet-control-attribution.ts';
-export * from './components/leaflet-control-scale.ts';
-export * from './components/leaflet-popup.ts';
-export * from './components/leaflet-tooltip.ts';
+export { default as LeafletMap } from './components/leaflet-map.ts';
+export { default as LeafletMarker } from './components/leaflet-marker.ts';
+export { default as LeafletCircle } from './components/leaflet-circle.ts';
+export { default as LeafletCircleMarker } from './components/leaflet-circle-marker.ts';
+export { default as LeafletLine } from './components/leaflet-line.ts';
+export { default as LeafletPolygon } from './components/leaflet-polygon.ts';
+export { default as LeafletPolyline } from './components/leaflet-polyline.ts';
+export { default as LeafletRectangle } from './components/leaflet-rectangle.ts';
+export { default as LeafletTileLayer } from './components/leaflet-tile-layer.ts';
+export { default as LeafletTileLayerWMS } from './components/leaflet-tile-layer-wms.ts';
+export { default as LeafletImageOverlay } from './components/leaflet-image-overlay.ts';
+export { default as LeafletVideoOverlay } from './components/leaflet-video-overlay.ts';
+export { default as LeafletSVGOverlay } from './components/leaflet-svg-overlay.ts';
+export { default as LeafletLayerGroup } from './components/leaflet-layer-group.ts';
+export { default as LeafletFeatureGroup } from './components/leaflet-feature-group.ts';
+export { default as LeafletGeoJSON } from './components/leaflet-geojson.ts';
+export { default as LeafletControlZoom } from './components/leaflet-control-zoom.ts';
+export { default as LeafletControlAttribution } from './components/leaflet-control-attribution.ts';
+export { default as LeafletControlScale } from './components/leaflet-control-scale.ts';
+export { default as LeafletPopup } from './components/leaflet-popup.ts';
+export { default as LeafletTooltip } from './components/leaflet-tooltip.ts';