Fix Safari emoji corruption bug by inserting ZWNJ between digits/symbols (#, *) and emojis

[abbasifaizan70]

Explanation of Change

This PR inserts a Zero-Width Non-Joiner (ZWNJ) between #/* and emojis, preventing Safari from creating these sequences and ensuring the text displays correctly.

Fixed Issues

$ #75634
PROPOSAL: #75634 (comment)

Tests

Testing Steps for New Message

1. Navigate to the web app in Safari
2. Open any existing conversation or start a new one
3. In the compose box, type a hash symbol (#) or asterisk (*)
4. Without adding a space, type an emoji shortcode (e.g., 😄, ❤️, 👍)
5. Press Enter or click Send
6. In the compose box, type a hash symbol (#) or asterisk (*)
7. Without adding a space, open the emoji picker and select an emoji
8. Press Enter or click Send
9. The message displays correctly with the symbol followed by the emoji (e.g., #😄, *😄)
10. No corrupted characters, malformed Unicode sequences, or keycap emoji conversion

Testing Steps for Edit Message

1. Navigate to the web app in Safari
2. Open any existing conversation that has a message you can edit
3. Click on an existing message and select "Edit" from the context menu
4. Clear the existing text and type a hash symbol (#) or asterisk (*)
5. Without adding a space, type an emoji shortcode (e.g., 😄, ❤️, 👍)
6. Press Enter or click the checkmark to save changes
7. Verify the edited message displays correctly with the symbol followed by the emoji (e.g., #😄, *😄)
8. Edit another message, type a hash symbol (#) or asterisk (*)
9. Without adding a space, open the emoji picker and select an emoji
10. Press Enter or click the checkmark to save changes
11. Verify the edited message displays correctly with the symbol followed by the emoji
12. No corrupted characters, malformed Unicode sequences, or keycap emoji conversion

• Verify that no errors appear in the JS console

Offline tests

Same as tests.

QA Steps

Same as tests.

• 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: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
• I verified there are no new alerts related to the canBeMissing param for useOnyx
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• If any new file was added I verified that:
  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
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  • The assets load correctly across all supported platforms.
• 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.
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Screen.Recording.2026-01-10.at.4.01.36.AM.mov

Android: mWeb Chrome

Screen.Recording.2026-01-10.at.3.51.44.AM.mov

iOS: Native

Screen.Recording.2026-01-10.at.3.47.17.AM.mov

iOS: mWeb Safari

Screen.Recording.2026-01-10.at.3.44.45.AM.mov

MacOS: Chrome / Safari

Screen.Recording.2026-01-10.at.1.50.58.AM.mov

[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
src/CONST/index.ts	83.47% <ø> (ø)
src/libs/EmojiUtils.tsx	63.05% <100.00%> (+0.37%)	⬆️
... and 57 files with indirect coverage changes

[melvin-bot]

@Krishna2323 Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

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[chatgpt-codex-connector]

Preserve keycap emoji instead of stripping them

The new normalization step removes the U+20E3 keycap combining mark for any 0-9, #, or * sequence (e.g., 1️⃣, *️⃣) before doing the ZWNJ insertion. On Safari this will convert legitimate keycap emoji selected from the emoji picker into plain characters, permanently altering the user’s message content even when no corruption occurs. This is a regression from the previous behavior (which left keycap emoji intact) and will cause Safari users to lose intended keycap emoji in messages.

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