[GLJS] Reduce redundant repaints during initial load (internal-16503)

GitOrigin-RevId: 56ca5f718e7e45bd72b92a0adc373881d2a4b898

Author: mourner

src/ui/map.ts

@@ -4593,7 +4593,9 @@ export class Map extends Camera {
                 now,
                 fadeDuration,
                 pitch,
-                transition: this.style.transition,
+                // Snap transitions before `load` so initial light transitions don't spin repaints;
+                // after `load`, user-triggered transitions must animate normally.
+                transition: this._loaded ? this.style.transition : {duration: 0, delay: 0},
                 worldview: this._worldview
             });
 
@@ -4677,10 +4679,6 @@ export class Map extends Camera {
             this._styleDirty = true;
         }
 
-        if (this.style && (!this.style.modelManager.isLoaded())) {
-            this._styleDirty = true;
-        }
-
         if (this.style && !this._placementDirty) {
             // Since no fade operations are in progress, we can release
             // all tiles held for fading. If we didn't do this, the tiles