feat: unified shell, diagnostics pack, native Office, sticky board

Make Surface remote debugging and classroom workflows viable: always-on
structured logs with one-click zip export, a single AppShell chrome,
OOXML PPTX/DOCX annotation without LibreOffice, and a first-class sticky
board. Also drop spike/legacy ink widgets and tighten pen feel
(predictor, PenInfoHistory, page-tile layer).

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

README.md

@@ -1,17 +1,18 @@
 # BadNote
 
-Local-first Surface Pen note-taking app with PDF/PPT annotation.
+Local-first Surface Pen note-taking app with PDF / PPTX / DOCX annotation.
 
 All notes, documents, search, and OCR run on your device. No server is required to use the app.
 
 ## Features
 
-- Ink notes with Surface Pen (pressure, stabilizer, undo/redo)
-- PDF and PPT import with page-level annotation
+- Unified shell: Library · Sticky board · Search · Settings
+- Ink notes with Surface Pen (pressure, predictor, undo/redo)
+- PDF annotation + native OOXML PPTX/DOCX viewers (no LibreOffice required)
+- Infinite sticky board with `[[wikilinks]]` / backlinks
 - Full-text search over note titles, typed text, and OCR results
-- **Local OCR** — pluggable, fully on-device. An embedded ONNX recognition
-  backend (cross-platform, CPU/iGPU) with a graceful fallback to the platform's
-  built-in OCR (Windows). See [Local OCR](#local-ocr).
+- Always-on diagnostics + one-click diagnostic pack export (Settings)
+- **Local OCR** — ONNX when bundled, else Windows WinRT
 
 ## Build (Windows)