feat(annotations): draw on the world by hand (#547)

Supersedes #235 by @cora-fresh-labs, ported onto the current component layout with fixes from review.

Verified before merge: format, package boundaries, unit suite, build, and the browser tracking suite; a browser harness for the change where one applies; adversarial review applied.

Future work (not in this PR): hand-drawn marks do not persist across a reload today, and neither do spoken annotations; there is no storage layer for marks. The natural home is Scenes: a drawing that belongs to a shot and persists per shot, so a scene animation can carry its own marks. Needs an owner.
Co-authored-by: Clint Borle <[email protected]>

src/app/tools.js

@@ -1,5 +1,6 @@
 import { SceneDirector } from '../scenes/director.js';
 import { initAnnotations } from '../annotations/index.js';
+import { initDrawTool } from '../annotations/drawTool.js';
 import { initGevVoiceCommands } from '../voice/gevRealtime.js';
 import { installScopeMask, destroyScopeMask } from '../scopeMask.js';
 import {
@@ -39,6 +40,11 @@ export function createApplicationTools({
     if (window.__gevAnnotations === annotations) delete window.__gevAnnotations;
     annotations.destroy();
   });
+  // DISPLAY ▸ Draw: the same whiteboard, drawn by hand. It claims the pointer
+  // while a session is open, so its teardown belongs to the application
+  // lifetime rather than to whoever last pressed the button.
+  const drawTool = initDrawTool({ viewer, annotations });
+  defer(() => drawTool?.destroy());
   if (startChrome)
     defer(startChrome({ loadingScreen, styleManager, dataManager, signal }));
   // Idle render governor: flips the scene into requestRenderMode whenever