fix: compile warnings

[SmilingPixel]

This pull request introduces several improvements and minor fixes across the codebase, focusing on build configuration, database handling, and code simplification. The most significant changes include updates to the Kotlin Multiplatform and Gradle build settings, corrections to database date handling, and code simplification in file export and Google Drive client logic.

[Copilot]

Pull request overview

This PR targets build/compile warning cleanup and small logic simplifications across the MarkDay Compose Multiplatform codebase, including Gradle/KMP settings adjustments and minor Kotlin code cleanups in persistence and sync/export paths.

Changes:

• Adjusts Kotlin Multiplatform/Gradle settings (disable default hierarchy template; add -Xexpect-actual-classes compiler arg).
• Updates Room persistence mapping for diary entry dates (epoch-days handling).
• Simplifies JVM export directory selection flow and Google Drive authorization code.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
gradle.properties	Disables default KMP hierarchy template; normalizes enableIos property line.
composeApp/build.gradle.kts	Adds -Xexpect-actual-classes to Kotlin compiler args for the module.
composeApp/src/nonWebMain/kotlin/io/github/smiling_pixel/database/DiaryDaoImpl.kt	Changes persisted entryDate mapping to use toEpochDays() directly (needs type fix).
composeApp/src/jvmMain/kotlin/io/github/smiling_pixel/sync/DiaryEntryExport.jvm.kt	Reworks null handling around directory selection to avoid !!.
composeApp/src/jvmMain/kotlin/io/github/smiling_pixel/client/GoogleDriveClient.kt	Simplifies authorize() by removing redundant credential-null branch.
composeApp/src/commonMain/kotlin/io/github/smiling_pixel/screens/EntryDetailsScreen.kt	Removes one !! in timestamp rendering (currently breaks nullability/compilation).

Comments suppressed due to low confidence (2)

composeApp/src/nonWebMain/kotlin/io/github/smiling_pixel/database/DiaryDaoImpl.kt:69

• RoomDiaryEntry.entryDate is a Long, but LocalDate.toEpochDays() returns an Int. This assignment won’t compile without converting to Long.

                entry.content,
                createdAt = entry.createdAt.toEpochMilliseconds(),
                updatedAt = entry.updatedAt.toEpochMilliseconds(),
                entryDate = entry.entryDate.toEpochDays(),
            ),

composeApp/src/nonWebMain/kotlin/io/github/smiling_pixel/database/DiaryDaoImpl.kt:83

• RoomDiaryEntry.entryDate is a Long, but LocalDate.toEpochDays() returns an Int. This assignment won’t compile without converting to Long.

                entry.content,
                createdAt = entry.createdAt.toEpochMilliseconds(),
                updatedAt = entry.updatedAt.toEpochMilliseconds(),
                entryDate = entry.entryDate.toEpochDays(),
            ),

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