Notes thumnail

[Tapesh-1308]

Description

This pull request introduces a new function, createThumbnailFromPDF, which generates a thumbnail image from the first page of a given PDF file using the pdfjs library. Key updates include reading the PDF as an ArrayBuffer, rendering the first page onto a canvas, converting the canvas to a PNG data URL, and updating the state with the thumbnail URL.

Resolves: 61

This PR introduces a new function createThumbnailFromPDF to generate a thumbnail image from the first page of a given PDF file using the pdfjs library. The key updates include:

-File Reading: Utilizes FileReader to read the PDF file as an ArrayBuffer.

-PDF.js Integration: Configures pdfjs to use a CDN worker script for handling PDF operations.

-Rendering PDF Page: Extracts the first page of the PDF and renders it onto a dynamically created canvas element.

-Thumbnail Generation: Converts the rendered canvas into a Data URL representing a PNG image of the PDF's first page.

-State Update: Sets the generated thumbnail URL to state using setThumbnailURL. These changes enhance the application's functionality by providing a visual preview of uploaded PDF files.

Additional Changes:

• Imported necessary CSS for react-pdf annotation layer.

• Configured pdfjs worker source to use the appropriate version from the CDN.

• This PR aims to improve the user experience by enabling PDF previews through thumbnail generation.

Checklist

Before submitting this pull request, kindly verify that the ensuing checkpoints have been reached.

• [x] Have you adhered to the repository's defined coding convention rules?
• [x] Have you sent a message along with the result or response?
• [x] Have you used the try-catch technique?

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