The night's pen-first rebuild (PenEditorScreen + PenCanvas + zoom fix +
eraser + M3 tool palette + render cache) was unreachable from the running
app: home_screen opened the OLD PdfAnnotatorScreen, so the user saw zero
change. Wire both PDF-open sites (import + open-existing) to PenEditorScreen,
making the entire editor/* stack LIVE on the real PDF path.
flutter analyze: 0 issues.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>