[AND-6] Add edge-to-edge support for apps targeting Android 15

[VelikovPetar]

🎯 Goal

Any apps targeting Android 15 (targetSdk=35) have edge-to-edge enabled by default. This means that some screens/components could be obstructed by the system bars / keyboard, making it impossible to interact with. Therefore, we must ensure that the screens we provide from the SDK are supporting edge-to-edge, otherwise integrator apps targeting Android 15 could have issues.

Note 1: This PR DOESN'T change the SDK / sample apps targetSdk value, as that might require other updates. It just makes sure that the affected screens are properly shown in apps targeting Android 15.

Note 2: This PR DOESN'T explicitly introduce edge-to-edge for all screens (for Android version < 15). The only screens where edge-to-edge is explicitly requested are screens which are already simulating such experience by colouring the system/navigation bars (which is now deprecated). In all other cases we try to preserve the current behaviour for Android < 15, and ensure the screens are still shown properly for Android >= 15.

Linear: https://linear.app/stream/issue/AND-6/implement-edge-to-edge-support-for-android-15
GitHub issue: #5458

🛠 Implementation details

ui-common:

• AttachmentDocumentActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() to ensure the content is not obstructed by status bar / navigation bar.

compose SDK:

• MediaGalleryPreviewActivity - apply content padding based on WindowInsets.systemBars to ensure the content is not obstructed by status bar / navigation bar + explicitly request enableEdgeToEdge(statusBarStyle, navigationBarStyle) to ensure the system bars are coloured properly (previously we used SystemUiController for that purpose)
• MediaPreviewActivity - apply content padding based on WindowInsets.systemBars to ensure the content is not obstructed by status bar / navigation bar + explicitly request enableEdgeToEdge(statusBarStyle, navigationBarStyle) to ensure the system bars are coloured properly (previously we used SystemUiController for that purpose). Here, both the background and the system bars are always shown as Color.Black, disregarding light/night mode.

xml SDK:

• ChannelListActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() to ensure the content is not obstructed by status bar / navigation bar.
• AttachmentActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() to ensure the content is not obstructed by status bar / navigation bar.
• AttachmentGalleryActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() to ensure the content is not obstructed by status bar / navigation bar.
• AttachmentMediaActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() to ensure the content is not obstructed by status bar / navigation bar + explicitly request enableEdgeToEdge(statusBarStyle, navigationBarStyle) to ensure the system bars are coloured properly (previously we used window.navigationBarColor/window.statusBarColor which are now deprecated).
• MessageListActivity - apply content padding based on WindowInsetsCompat.Type.systemBars() + WindowInsetsCompat.Type.ime(). Ensures that the content is not obstructed by status bar / navigation bar, and ensures that the content is not obstructed by the soft keyboard.

🎨 UI Changes

TargetSdk = 34 (Should look the same before and after the changes)

Screen	Before (portrait)	Before (landscape)	After (portrait)	After (landscape)
AttachmentDocumentActivity
MediaGalleryPreviewActivity
MediaPreviewActivity
ChannelListActivity
AttachmentActivity
AttachmentGalleryActivity
AttachmentMediaActivity
MessageListActivity

TargetSdk = 35 (The components should not be cut-off by the system bars)

Screen	Before (portrait)	Before (landscape)	After (portrait)	After (landscape)
AttachmentDocumentActivity
MediaGalleryPreviewActivity
MediaPreviewActivity
ChannelListActivity
AttachmentActivity
AttachmentGalleryActivity
AttachmentMediaActivity
MessageListActivity

🧪 Testing

1. Set Configuration.sampleTargetSdk = 35
2. Install either ui-components-sample or compose-sample
3. Open any of the affected screens (Ex. open Image/Audio/Video/PDF attachment) from a channel

☑️Contributor Checklist

General

• I have signed the Stream CLA (required)
• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#android-chat-core or #android-chat-ui) (required)
• PR targets the develop branch
• PR is linked to the GitHub issue it resolves

Code & documentation

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (KDocs, docusaurus, tutorial)

☑️Reviewer Checklist

• UI Components sample runs & works
• Compose sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• Release notes and docs clearly describe changes
• All code we touched has new or updated KDocs

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