CI : Integrate ktlint into Github Actions

[DongChyeon]

Add ktlint check to CI workflow to enforce consistent code style
CI will now fail if ktlint format violations are found

[Copilot]

Pull Request Overview

Adds ktlint to the Gradle version catalog and updates the GitHub Actions CI workflow to run ktlint style checks as part of the build.

• Introduces a ktlint version and plugin alias in libs.versions.toml
• Creates/updates the Android CI workflow to run ktlintCheck alongside assembleDebug

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
gradle/libs.versions.toml	Added ktlint version and plugin alias to version catalog
.github/workflows/android_ci.yml	New CI workflow runs ktlintCheck then builds the app

Comments suppressed due to low confidence (2)

.github/workflows/android_ci.yml:9

• The CI trigger only covers *.kt files. Consider adding **/*.kts to also rerun CI when Kotlin script files change.

-      - '**/*.kt'

.github/workflows/android_ci.yml:53

• This job runs lint and assemble but doesn't execute unit tests. Consider adding a test or check task to ensure full code validation.

run: ./gradlew ktlintCheck assembleDebug

[Copilot]

[nitpick] The plugin aliases list is not alphabetically ordered. Consider reordering entries to keep the version catalog organized.

Suggested change

	jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
	android-library = { id = "com.android.library", version.ref = "agp" }
	maven-publish = { id = "com.vanniktech.maven.publish", version.ref = "mavenPublish" }
	ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }
	android-library = { id = "com.android.library", version.ref = "agp" }
	jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
	ktlint = { id = "org.jlleitschuh.gradle.ktlint", version.ref = "ktlint" }
	maven-publish = { id = "com.vanniktech.maven.publish", version.ref = "mavenPublish" }