fix(player,studio): resolve root timeline from DOM instead of last key (#247)

Bundled previews register a master composition alongside its sub-compositions
in `window.__timelines`, e.g. { main, intro, scene2, scene5 }. Both the
player's probe and studio's getAdapter() were using `keys[keys.length - 1]`
to pick the adapter, which returned whichever timeline was registered last.

That made the player report the final sub-composition's duration as the
video length (e.g. 3.2s instead of the master's 14s) and play/pause/seek
targeted that sub-composition instead of the full composition.

Look up the outermost `[data-composition-id]` element in the iframe DOM
and use its id to select the right timeline. Falls back to last-key when
no element is present (standalone sub-composition previews) so drill-down
views keep working.

Also restores `main`/`import` entry points on @hyperframes/player to
point at compiled dist output (the src/ paths broke workspace consumers
that only receive the published tarball).

packages/studio/src/player/hooks/useTimelinePlayer.ts

@@ -238,7 +238,17 @@ export function useTimelinePlayer() {
 
       if (win.__timelines) {
         const keys = Object.keys(win.__timelines);
-        if (keys.length > 0) return wrapTimeline(win.__timelines[keys[keys.length - 1]]);
+        if (keys.length > 0) {
+          // Resolve the root composition id from the DOM — the outermost
+          // `[data-composition-id]` element is the master. Without this,
+          // Object.keys() order would let a sub-composition's timeline
+          // hijack play/pause/seek and the duration readout.
+          const rootId = iframe?.contentDocument
+            ?.querySelector("[data-composition-id]")
+            ?.getAttribute("data-composition-id");
+          const key = rootId && rootId in win.__timelines ? rootId : keys[keys.length - 1];
+          return wrapTimeline(win.__timelines[key]);
+        }
       }
 
       return null;