core: manual buffer sync with sync-rows, reuse unchanged buffers and pipelines across activations

Also lets the screenshot suite point at another reference directory and settle longer.

Amp-Thread-ID: https://ampcode.com/threads/T-01a0b2dd-db32-712d-99ce-12ce4a86d979
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

addons/handles/src/Scene.ts

@@ -990,6 +990,7 @@ export class Scene {
       this.#geometry.get(geometry) ??
       this.#geometry.set(geometry, new Map()).get(geometry)!
     ).set(kind, data);
+    await this.core.syncRows(name, 0, rowCount);
     if (updateGraph) await this.updateRenderGraph();
   }
 
@@ -1248,7 +1249,7 @@ export class Scene {
           id: vertex,
           array: `geometry.${mesh.geometryId}.positions`,
           usage: ["vertex"],
-          sync: "loadout",
+          sync: "manual",
         });
         const normal = `geometry-${mesh.geometryId}-normals`;
         const uv = `geometry-${mesh.geometryId}-uvs`;
@@ -1272,7 +1273,7 @@ export class Scene {
               id,
               array: `geometry.${mesh.geometryId}.${kind}`,
               usage: ["vertex"],
-              sync: "loadout",
+              sync: "manual",
             });
         const indexed = mesh.indexCount > 0;
         if (indexed)
@@ -1280,7 +1281,7 @@ export class Scene {
             id: `geometry-${mesh.geometryId}-indices`,
             array: `geometry.${mesh.geometryId}.indices`,
             usage: ["index"],
-            sync: "loadout",
+            sync: "manual",
           });
         const draws =
           indexed && mesh.faceMaterials.size