Replace @Observable macro with ObservableObject pattern to fix crash
during app launch on iOS 15-16 devices.
Root cause:
- PassThroughWindow used @Observable macro (iOS 17+ API)
- Despite @available(iOS 18, *), Swift compiled metadata into binary
- During app launch, Realm's objc_copyClassList() triggered metadata
loading for all classes
- @Observable generated code referenced symbols unavailable on iOS 15/16
- Result: null pointer dereference crash at startup
The fix:
- Replace @Observable with ObservableObject + @Published properties
- These patterns work on iOS 13+, safe for iOS 15/16
- No behavioral changes, same observation mechanism
- Maintains @available(iOS 18, *) for class usage
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
Introduces a maxToastWidth constant to cap the expanded width of the
toast view at 400 points, ensuring it does not exceed this value
regardless of screen size.
<!-- Thank you for submitting a Pull Request and helping to improve Home
Assistant. Please complete the following sections to help the processing
and review of your changes. Please do not delete anything from this
template. -->
## Summary
<!-- Provide a brief summary of the changes you have made and most
importantly what they aim to achieve -->
## Screenshots
<!-- If this is a user-facing change not in the frontend, please include
screenshots in light and dark mode. -->
## Link to pull request in Documentation repository
<!-- Pull requests that add, change or remove functionality must have a
corresponding pull request in the Companion App Documentation repository
(https://github.com/home-assistant/companion.home-assistant). Please add
the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
## Any other notes
<!-- If there is any other information of note, like if this Pull
Request is part of a bigger change, please include it here. -->
<!-- Thank you for submitting a Pull Request and helping to improve Home
Assistant. Please complete the following sections to help the processing
and review of your changes. Please do not delete anything from this
template. -->
## Summary
<!-- Provide a brief summary of the changes you have made and most
importantly what they aim to achieve -->
## Screenshots
<!-- If this is a user-facing change not in the frontend, please include
screenshots in light and dark mode. -->
<img width="1796" height="804" alt="CleanShot 2026-01-16 at 13 11 31@2x"
src="https://github.com/user-attachments/assets/4c0be252-f3b6-4ff5-b27e-8b11f19eaee4"
/>
## Link to pull request in Documentation repository
<!-- Pull requests that add, change or remove functionality must have a
corresponding pull request in the Companion App Documentation repository
(https://github.com/home-assistant/companion.home-assistant). Please add
the number of this pull request after the "#" -->
Documentation: home-assistant/companion.home-assistant#
## Any other notes
<!-- If there is any other information of note, like if this Pull
Request is part of a bigger change, please include it here. -->
