fix(app): markdown rendering with morphdom for better dom functions

[ProdigyRahul]

What does this PR do?

Fixes scroll jumping/flickering that occurred when streaming markdown content with code blocks.

Adam (@adamdotdevin) What I did is

• Replace innerHTML with morphdom for incremental DOM updates
• Configure morphdom to preserve copy button wrappers (data-component="markdown-code") and buttons (data-slot="markdown-copy-button")
• Debounce setupCodeCopy() by 150ms so it only runs after content settles, not on every streaming update (for better ux uk)

Watch this videos for see the diff:

Issue:
Video: https://www.youtube.com/watch?v=rn7zQlxb1yU
(make sure you watch this video before 24 hours of pr created otherwise it will get deleted xD)

Solution:
Video: https://www.youtube.com/watch?v=B3NQV7KJp3o
(make sure you watch this video before 24 hours of pr created otherwise it will get deleted xD)

How did you verify your code works?

• Tested streaming responses with multiple code blocks
• Verified scroll follows content smoothly without jumping
• Verified copy buttons appear and work correctly after streaming completes
• Verified user scroll-up pauses auto-scroll, scroll-to-bottom resumes it

@adamdotdevin ready for merge!
solves issue: #10372

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