@eVoloshchak , @neil-marcellini PR is ready for review.
I have addressed Neil's finding on slight outline in #20470 (comment), but looks like that is due to Webkit browser behaviour, only happens on long press right after page reload, does not affect the app functional behaviour.
The PR here has fixed the text selection problem reported in the original issue.

Details

disable user select on mobile web sidebar chat list, so that long pressing on mobile web will not select huge chunk of text, and does not trigger mobile OS copy/paste menu.

Fixed Issues

$ #20470
PROPOSAL: #20470 (comment)

Tests

Note: Only applicable for mobile devices

1. Login with any user on using mobile web Safari / Chrome
2. Long press one of the chats
3. Validate no text are getting selected, and "Pin" context menu appear at bottom

• Verify that no errors appear in the JS console

Offline tests

N/A

QA Steps

Note: Only applicable for mobile devices

1. Login with any user on using mobile web Safari / Chrome
2. Long press one of the chats
3. Validate no text are getting selected, and "Pin" context menu appear at bottom

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android / native
  • Android / Chrome
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
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• I have checked off every checkbox in the PR author checklist, including those that don't apply to this PR.

Screenshots/Videos