Implement native print dialog for PDF export

- Replaced jsPDF client-side generation with Tauri's native print dialog
- Created PrintView component that renders note content in a print-optimized layout
- Added print-export window capability with webview creation and print permissions
- Implemented event-based communication between main window and print window
- Moved shared print/export utilities to printExport.ts (title extraction, filename sanitization)
- Changed export button icon from download

src-tauri/capabilities/default.json

@@ -2,9 +2,11 @@
   "$schema": "../gen/schemas/desktop-schema.json",
   "identifier": "default",
   "description": "Capability for the main window",
-  "windows": ["main"],
+  "windows": ["main", "print-export-*"],
   "permissions": [
     "core:default",
+    "core:webview:allow-create-webview-window",
+    "core:webview:allow-print",
     "opener:default",
     "http:default",
     {