Fix new-capture auto-hide, library capture bar, step delete, and click-capture timing

- New Capture sessions now start paused; the window only tucks away once
  the user clicks "Start recording" in the capture bar instead of hiding
  ~1.2s after starting.
- The capture status bar is shown only in the editor view, not over the
  library.
- Fix openModal/confirmDialog resolving as cancelled when an action button
  is clicked, which made the step "Delete" button (and other modal actions)
  silently no-op.
- Click-triggered captures now use the click-time cursor position for the
  marker and arm the capture cache as soon as recording starts, so the
  first click is captured instantly and accurately placed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/renderer/editor.js

@@ -1146,7 +1146,7 @@ class GuideEditor {
 
   async startCaptureSession() {
     await api.capture.session({ action: 'start', guideId: this.guideId });
-    this.onToast('Capture session started.');
+    this.onToast('Capture session ready — click "Start recording" in the red bar when you\'re set.');
     this.emitMeta();
   }