Add videoPreviewModifier slot to CallLobby

[aleksandar-apostolov]

Goal

Closes AND-1253. CallLobby hardcoded the preview Box to responsiveHeight + fillMaxWidth + RoundedCornerShape(12.dp) with no override. iOS sizes via the parent's GeometryReader, React via className — Android was the outlier.

Implementation

Add videoPreviewModifier: Modifier to CallLobby. Default preserves the previous chain via a private defaultVideoPreviewModifier() helper, so existing callers see no change.

CallLobby(
    call = call,
    videoPreviewModifier = Modifier
        .height(360.dp)
        .fillMaxWidth()
        .clip(RoundedCornerShape(24.dp)),
)

Testing

spotlessApply, apiDump, compileDebugKotlin, and CallLobbyTest paparazzi snapshot all pass locally.

☑️Contributor Checklist

General

• PR targets the `develop` branch

Code & documentation

• Changelog is updated with client-facing changes

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled, or the PR is bot-authored.
• An issue is linked (Linear ticket or GitHub issue), or the PR is bot-authored.

🎉 Great job! This PR is ready for review.

[coderabbitai]

Walkthrough

CallLobby gains a new videoPreviewModifier parameter (Modifier) with a default provided by the private defaultVideoPreviewModifier() helper, which applies responsive height, full width, and 12dp rounded clipping. The preview Box now uses this parameter instead of a locally constructed modifier. The public API signature and changelog are updated accordingly.

Changes

CallLobby videoPreviewModifier

Layer / File(s)	Summary
videoPreviewModifier parameter, default helper, and API stream-video-android-ui-compose/src/main/kotlin/io/getstream/video/android/compose/ui/components/call/lobby/CallLobby.kt, stream-video-android-ui-compose/api/stream-video-android-ui-compose.api, CHANGELOG.md	Adds videoPreviewModifier: Modifier = defaultVideoPreviewModifier() to CallLobby's signature, replaces the inline boxModifier in the preview Box with it, introduces the private defaultVideoPreviewModifier() composable computing responsive height and rounded corner clipping, updates KDoc, reflects the inserted Modifier parameter in the public API file, and adds the changelog entry.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Suggested labels

pr:new-feature

Suggested reviewers

• rahul-lohra

Poem

🐇 A modifier hops into the lobby today,
With rounded corners shaped just the right way.
Default or custom, your preview box bends,
Responsive and clipped from start to ends.
The rabbit signs off — what a fine API! 🎨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding a videoPreviewModifier parameter to CallLobby for customization.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	PR description covers Goal, Implementation with code example, and Testing sections. Most required template sections are present and properly filled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/call-lobby-video-preview-modifier

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[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-video-android-core	12.27 MB	12.27 MB	0.00 MB	🟢
stream-video-android-ui-xml	5.68 MB	5.68 MB	0.00 MB	🟢
stream-video-android-ui-compose	6.20 MB	6.20 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[stream-public-bot]

🚀 Available in v1.28.0