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/css/styles.css

@@ -701,6 +701,33 @@ button:disabled,
   pointer-events: none;
 }
 
+/* Color picker */
+input[type='color'] {
+  width: 2.5rem;
+  height: 2.5rem;
+  padding: 0;
+  border: 2px solid #4b5563;
+  border-radius: 9999px;
+  background: transparent;
+  cursor: pointer;
+  appearance: none;
+  -webkit-appearance: none;
+}
+
+input[type='color']::-webkit-color-swatch-wrapper {
+  padding: 0;
+}
+
+input[type='color']::-webkit-color-swatch {
+  border: none;
+  border-radius: 9999px;
+}
+
+input[type='color']::-moz-color-swatch {
+  border: none;
+  border-radius: 9999px;
+}
+
 /* Hide spin buttons for number inputs */
 input[type='number'] {
   appearance: none;