fix(ci): add multi_json to sample_app Gemfiles

[xsahil03x]

Summary

• Sample-app Android & iOS builds started failing on PRs with bundler: failed to load command: fastlane … multi_json is not part of the bundle.
• Root cause: representable (pulled in transitively by fastlane → google-apis-playcustomapp_v1 → google-apis-core) does require 'multi_json' but no longer declares it as a runtime dep. With no Gemfile.lock in the repo, each CI run resolves fresh from rubygems, and a recently published gem version dropped multi_json from the transitive chain. Ruby 3.3's stricter bundle enforcement then turns the missing gem into a hard LoadError.
• Fix: declare gem "multi_json" explicitly in both sample_app/android/Gemfile and sample_app/ios/Gemfile.

This is latent on master (build job is skipped on push) and currently surfacing on PRs targeting v10.0.0 (e.g. #2716, #2679). Landing on master and merging down to v10.0.0 unblocks both.

Test plan

• CI build (android) passes on this PR
• CI build (ios) passes on this PR
• After merge, rebase/merge master into v10.0.0 and confirm docs(ui): add more docs snapshots #2716 builds pass

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Added multi_json dependency to Android and iOS build configurations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 80441493-7631-428e-a557-eaee872b9257

📥 Commits

Reviewing files that changed from the base of the PR and between 13798f0 and ed5819b.

📒 Files selected for processing (2)

• sample_app/android/Gemfile
• sample_app/ios/Gemfile

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📝 Walkthrough

Walkthrough

The multi_json gem dependency is added to both the Android and iOS sample app Gemfiles as a new direct dependency alongside existing gems like fastlane and cocoapods.

Changes

Multi-JSON Dependency Addition

Layer / File(s)	Summary
Add multi_json gem to sample apps sample_app/android/Gemfile, sample_app/ios/Gemfile	The multi_json gem is declared in both the Android and iOS sample app Gemfiles.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• VelikovPetar
• renefloor

Poem

🐰 A gem so small, yet needed twice,
Through Android, iOS—oh so nice!
Multi-json hops along the way,
Simplifying data every day! 📦✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding multi_json dependency to sample app Gemfiles. It is specific, concise, and directly matches the changeset.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-multi-json-bundle

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.66%. Comparing base (13798f0) to head (ed5819b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2728   +/-   ##
=======================================
  Coverage   65.66%   65.66%           
=======================================
  Files         424      424           
  Lines       26724    26724           
=======================================
  Hits        17549    17549           
  Misses       9175     9175           

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