Migrate AttachmentModalContainer to use the Reanimated modal

[mhawryluk]

Explanation of Change

Fixed Issues

$ #64776
PROPOSAL: N/A

Tests

1. Open a chat
2. Send a few images (more than one)
3. Click on the image in the chat
4. Go through the photos
5. Close the modal while viewing the photo, that isn't the first one in the list
6. See if the modal fades in and out properly (on wide web/desktop) or slides in and out from the right side (elsewhere)

Offline tests

N/A

QA Steps

Same as tests

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
  • MacOS: Desktop
• 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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  • 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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  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
• 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

Nagranie.z.ekranu.2025-08-8.o.18.03.14.mov

Android: mWeb Chrome

Nagranie.z.ekranu.2025-08-8.o.18.08.19.mov

iOS: Native

Simulator.Screen.Recording.-.iPhone.16.Pro.Max.-.2025-08-08.at.18.04.22.mp4

iOS: mWeb Safari

Simulator.Screen.Recording.-.iPhone.16.Pro.Max.-.2025-08-08.at.18.06.39.mp4

MacOS: Chrome / Safari

Nagranie.z.ekranu.2025-08-8.o.18.01.52.mov

MacOS: Desktop

Nagranie.z.ekranu.2025-08-8.o.18.11.41.mov

[mhawryluk]

currently, there is a bug in reanimated that causes always the first attachment to be displayed during the exiting animation on web, even when a different one is selected. I created a PR fixing this: software-mansion/react-native-reanimated#7942

[mhawryluk]

moved here: #68343