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/data/trackingClickGesture.js

@@ -1,4 +1,5 @@
 import * as Cesium from 'cesium';
+import { isPointerFree } from './inputOwnership.js';
 
 export const MAX_TRACKING_CLICK_TRAVEL_PX = 6;
 export const MAX_TRACKING_CLICK_DURATION_MS = 400;
@@ -95,6 +96,9 @@ export function bindTrackingClickGesture(handler, onClick, options = {}) {
     if (pressActive) finishPress(click?.position);
     const gesture = completedGesture || { travelPx: 0, durationMs: 0 };
     completedGesture = null;
+    // A tool owns the pointer: a draw vertex placed over an aircraft is a
+    // vertex, not a track request (src/data/inputOwnership.js).
+    if (!isPointerFree()) return;
     onClick(click, gesture);
   }, eventTypes.LEFT_CLICK);
 }