Add context menu options for image copy and download

[itsmnx]

Related Issue (if any)

Closes: #62

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Describe the add-ons or changes you've made

• Investigated issues listed in the repository related to image copy and download options.
• Cloned the repository and created a new branch feature.context-menu-image.
• Analyzed main.js and identified the issue in context-menu.js.
• Added two new options in the context menu:
  1. Copy Image
  2. Download Image
• Updated context-menu.js and ensured correct integration with main.js.
• Installed necessary npm packages and started the application.

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (adds image copy and download functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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How Has This Been Tested?

• Ran npm install and npm start to launch the application.
• Searched for images in the application and right-clicked on them.
• Verified that Copy Image and Download Image options appear in the context menu.
• Tested Copy Image by pasting into Paint and confirmed the image was successfully copied.
• Verified Download Image option downloads the image correctly.

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Checklist:

• My code follows the "contribution guidelines" of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.

Screenshots (Only for Front End and UI/UX Designers)

Original Screenshot-

1. No copy image option is shown when right-click on image-

Updated Screenshot -

1. Image copy option when right-click on image->Copy

3. Pasted copied image in online Paint tool by going to File Tab-> Paste