feat: Clicking Image in files aggregator now opens image Gallery

[thepiyush-303]

Brief Title

Acceptance Criteria fulfillment

• [x] clicking image files opens image Gallery
• [x] clicking on other types of file download the file

Fixes #823

Video/Screenshots

Before: Clicking does not do anything. After:

https://github.com/user-attachments/assets/7d518d6c-74d9-480e-9918-5b149c80910e

PR Test Details

Note: The PR will be ready for live testing at https://rocketchat.github.io/EmbeddedChat/pulls/pr-824 after approval. Contributors are requested to replace <pr_number> with the actual PR number.

[Spiral-Memory]

@thepiyush-303 Resolve conflicts and attach videos in mp4

[thepiyush-303]

@Spiral-Memory Done.