TF-3601 Add adr for issue fix iOS email view gone blank with large HTML content

Signed-off-by: dab246 <[email protected]>

Author: dab246

docs/adr/0058-fix-ios-email-view-gone-blank-with-large-html-content.md

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+# 58. Fix iOS email view gone blank with large HTML content
+
+Date: 2024-04-05
+
+## Status
+
+- Issues: 
+  - [iOS Email view gone blank with large HTML content #3601](https://github.com/linagora/tmail-flutter/issues/3601)
+
+## Context
+
+- On iOS, when using an `InAppWebView` inside a `SingleChildScrollView`, the height of the `SingleChildScrollView` depends on the `InAppWebView`. 
+Continuously updating the height of the `InAppWebView` up to a certain limit can cause the `SingleChildScrollView` to fail to render, 
+resulting in the content of the `InAppWebView` not being displayed.
+
+## Decision
+
+- Workaround:
+
+Set the maximum display height for content on iOS to `22,000` (not an absolute limit, but verified across various emails and found to be the most reasonable value).
+If the email content exceeds this height, a `View entire message` button will be displayed at the bottom of the email.
+When users click this button, they will be able to view the full email content, similar to previewing an EML file.
+
+
+## Consequences
+
+- All emails display fine on iOS