Add a text-annotation tool to the PDF editor. With the text tool a
pen-tap, or a mouse double-click, drops a text box at that normalized
page point and focuses a real Flutter TextField — so the OS IME and the
Windows-Ink handwriting panel feed it (device-validated). Tapping an
existing box re-opens it; clearing it deletes it.
- SidecarText {nx, ny, text, fontSize (page-relative), color} per page,
glued under zoom; stored in the sidecar `texts` field (back-compat
missing -> none), saved via scheduleTextsSave and loaded on open.
- Rendered in pageOverlaysBuilder at the scaled position.
PDF editor only for now (note text later). analyze clean, 397 tests.
Akiba So
20add27a30