fix(scenes): draw a preloading scene after a paused seek lands in it

[karngyan]

Closes #47.

When Stage draws scene 1 it preloads scene 2 with no onDone. A paused seek into scene 2 while that preload is in flight called ensureLoaded(id, bump), which returned at pending.has(id) and dropped the callback. Paused, nothing else re-renders the stage, so it stayed empty (most often on ?t= deep links).

pending is now a map of waiters per id: a caller asking for a scene already in flight joins the waiters, and every waiter runs when the load resolves.

• Regression test: a seek into a scene still preloading draws it once the load lands (fails on main, passes here)
• Full suite 268/268, tsc and eslint clean
• Patch changeset included

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