feat(engine): enable CanvasDrawElement in renderer Chrome args

Cherry-picked from feat/html-in-canvas-launch (PR #611):

- Enable --enable-features=CanvasDrawElement in Chrome browser args
  so HTML-in-canvas compositions render correctly
- Add native drawElementImage() capture path for shader transitions
  with existing fallback preserved
- Reuse renderer Chrome args in hyperframes validate for consistent
  WebGL/CanvasDrawElement environment
- Add capture.test.ts for the new shader transition capture path

packages/engine/src/services/browserManager.ts

@@ -265,6 +265,8 @@ export interface BuildChromeArgsOptions {
   platform?: NodeJS.Platform;
 }
 
+const CANVAS_DRAW_ELEMENT_FEATURE_FLAG = "--enable-features=CanvasDrawElement";
+
 export function buildChromeArgs(
   options: BuildChromeArgsOptions,
   config?: Partial<Pick<EngineConfig, "browserGpuMode" | "disableGpu" | "chromePath">>,
@@ -282,6 +284,7 @@ export function buildChromeArgs(
     "--no-sandbox",
     "--disable-setuid-sandbox",
     "--disable-dev-shm-usage",
+    CANVAS_DRAW_ELEMENT_FEATURE_FLAG,
     "--enable-webgl",
     "--ignore-gpu-blocklist",
     ...getBrowserGpuArgs(browserGpuMode, platform),