refactor(mobile): Migrate durationInSeconds to durationInMilliseconds

[LeLunZ]

The last refinement for showing animated images. Migrating durationInSeconds to durationInMilliseconds.
This is needed so all remote animated images show as actual animated images.

The current problem is that if an animated image is shorter than a second, then the duration will be set to 0, and thus all remote assets will just show as still image.

I hope I didn't touch any old code (old ISAR entities).

Regarding migration of current values: The db migration just multiplies the current value with 1000 which isn't optimal but:

• it more or less has the same state as previously (as previously the milliseconds where omitted, so it doesn't really make a difference)
• and next time the full local sync runs _assetsEqual will notice the change in milliseconds and updates the object.
• The only "issue" is that images that currently have durationInSeconds 0 (but actually have a few milliseconds), will only be detected on the next full sync (whenever that is). But as this also was an issue before...I don't think that we need a migration for that? So I think this should be fine.
• Or do you prefer if I add another dart side migration like _populateLocalAssetPlaybackStyle again?

[Copilot]

Pull request overview

This PR migrates the asset duration field from durationInSeconds (integer, seconds precision) to durationInMilliseconds (integer, milliseconds precision) across the entire mobile stack. This fixes a bug where animated images shorter than one second would have their duration truncated to 0 and be displayed as still images.

Changes:

• Renames durationInSeconds → durationInMilliseconds across all domain models, DB entities, platform pigeon APIs (Dart/Swift/Kotlin), and SQL queries.
• Adds a Drift DB migration (v21 → v22) that renames the column and multiplies existing values by 1000.
• Extends toDuration() to parse fractional seconds (e.g., "0:00:00.500000") in addition to plain HH:MM:SS strings.

Reviewed changes

Copilot reviewed 34 out of 36 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
mobile/lib/domain/models/asset/base_asset.model.dart	Core model field rename; playbackStyle and duration getters updated
mobile/lib/infrastructure/utils/asset.mixin.dart	Drift table mixin field renamed
mobile/lib/infrastructure/repositories/db.repository.dart	Schema version bumped to 22; migration from v21 added
mobile/lib/infrastructure/repositories/db.repository.steps.dart	Generated migration steps for Schema22
mobile/lib/extensions/string_extensions.dart	toDuration() updated to handle fractional seconds
mobile/ios/Runner/Sync/PHAssetExtensions.swift	iOS: duration now passed as milliseconds (* 1000)
mobile/android/app/src/main/kotlin/app/alextran/immich/sync/MessagesImplBase.kt	Android: removed /1000 division (MediaStore already provides ms)
mobile/pigeon/native_sync_api.dart / Messages.g.*	Platform message field rename in Dart/Swift/Kotlin
All entity/drift files	Auto-generated code updated to reflect new column name
All test files	Test fixtures and stubs updated

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