feat(landing) : add watch demo modal

[ZAINABKANGSIWALA]

Fixes #39

What changed?

Frontend (Landing.jsx)

• Added a video demo modal for the “Watch Demo” button in the hero section

• Created a reusable DemoModal component with an embedded video iframe (temporary placeholder)

• Implemented state handling (showDemo) to control modal visibility

• Clicking “Watch Demo” opens the modal, and users can close it via:

  • Close (X) button
  • Clicking outside the modal

• Prevents background interaction while modal is open (backdrop overlay with blur)

Type

• New feature

Testing

• Verified modal opens correctly on button click
• Verified close behavior (X button + outside click)
• Video loads properly inside iframe
• UI works as expected on desktop and mobile screens

[rdodiya]

Hi @ZAINABKANGSIWALA ,
Please resolve conflicts and only keep changes of demo modal and remove other changes.

The Ui of landing page has been fully changed , revert this changes and keep only demo modal changes.
Revert below changes

Keep this changes only

[ZAINABKANGSIWALA]

Okay