Refactor color input fields and enhance watermark functionality

- Updated color input fields in various HTML pages to remove unnecessary classes for improved styling consistency.
- Modified the watermark node to include options for positioning and flattening watermarks.
- Enhanced the addTextWatermark function to support customizable positioning and page selection for watermarks.
- Added new controls for text and image watermarks in the UI, allowing users to specify text, font size, color, opacity, angle, and image scaling.
- Updated the WASM provider to use the latest version of pymupdf-wasm.

src/js/types/add-watermark-type.ts

@@ -1,6 +1,10 @@
 import { PDFDocument as PDFLibDocument } from 'pdf-lib';
 
 export interface AddWatermarkState {
-    file: File | null;
-    pdfDoc: PDFLibDocument | null;
-}
+  file: File | null;
+  pdfDoc: PDFLibDocument | null;
+  pdfBytes: Uint8Array | null;
+  previewCanvas: HTMLCanvasElement | null;
+  watermarkX: number; // 0–1, percentage from left
+  watermarkY: number; // 0–1, percentage from top (flipped to bottom for PDF)
+}