fix: address final review findings (clip reset, codecs, paths, timeline)

Co-authored-by: Cursor <cursoragent@cursor.com>

src/App.svelte

@@ -10,7 +10,8 @@
   import ExportDialog from '$lib/components/ExportDialog.svelte';
   import { loadPreferences } from '$lib/stores/preferences.svelte';
   import { getSelectedClipId, removeClip } from '$lib/stores/clips.svelte';
-  import { adjustShuttle } from '$lib/transport/playback';
+  import { adjustShuttle, resetShuttleRate } from '$lib/transport/playback';
+  import { session } from '$lib/stores/videoSession.svelte';
   import type { TransportKeyAction } from '$lib/transport/playback';
 
   let showSetupWizard = $state(true);
@@ -24,6 +25,13 @@
     loadPreferences();
   });
 
+  $effect(() => {
+    if (session.status === 'resolving') {
+      shuttleRate = 1;
+      resetShuttleRate();
+    }
+  });
+
   function dispatchTransport(action: TransportKeyAction) {
     transportControls?.handleKeyAction(action);
   }