Add Export as PNG/PDF Option for Graphs

[sneha-94]

his PR introduces the ability to export graphs as PNG or PDF files directly from the dashboard, making it easier for users to save and share visual insights.

🚀 Key Features Added:
📸 Export as PNG using html2canvas

🧾 Export as PDF using jsPDF

🧩 Export buttons added to each chart container

✍️ Users can enter a custom filename before download

💾 Supports both modern browsers and offline use

🛠️ Implementation Details:
Added utility function exportGraph(containerId, format)

Integrated export buttons with onclick handlers for both PNG & PDF

Input field for custom filename added above each chart

Ensured layout doesn't shift during capture using fixed sizing

[github-actions]

👋 Thank you for raising an issue! We appreciate your effort in helping us improve. A maintainer from Dataverse will review it shortly. Stay tuned!

[krishma1911]

Can PA plz assign this issue to me ? i have implemented Export as PDF/PNG feature before as well.