feat: add support for non-markdown files and improve drawings UI

- Added scanning and metadata tracking for non-markdown files (images, PDFs, videos, code files)
- Redesigned drawings editor header with new toolbar layout and dropdown menus
- Added file picker dropdown to easily open existing .excalidraw files
- Implemented new file creation flow with auto-generated filenames
- Added export options menu with PNG/SVG/JSON export variants
- Updated proxy config to support vault file access
- Adde

src/app/features/note-view/components/pdf-viewer/pdf-viewer.component.html

@@ -0,0 +1,8 @@
+<div class="w-full h-full overflow-auto">
+  <ngx-extended-pdf-viewer
+    [src]="cleanSrc()"
+    [zoom]="'page-width'"
+    height="100%">
+  </ngx-extended-pdf-viewer>
+  
+</div>