Initial logic for scroll view to required attachment

[Pratheek555]

Brief Title

Implement initial scroll-to-message logic for navigating to attachments from the All Files view

Acceptance Criteria fulfillment

• Clicking a file in the All Files view navigates to the original message
• The chat scrolls smoothly to the target message

Fixes #1057

Video/Screenshots

EmbeddedChat._.Simple.-.Simple.Storybook.-.Brave.2026-01-07.13-46-01.mp4

PR Test Details

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

[Spiral-Memory]

If a file isn’t in the current DOM, how would you navigate to that file attachment? Similar issues, like finding a starred message, often require implementing solutions with tools such as react-virtuoso, tanstack, or similar libraries. It would great for everyone to collaborate on this for a sustainable fix.

Ref: #1059

[Pratheek555]

Hey @Spiral-Memory

I have been looking into using Tanstack query to solve this issue, will be working on a PR towards it. Please do let me know if you wanted anything different.

Thank you!