[pasichDev]

Merge order: into migrate-to-kmp before #92 is merged, so the fix ships in 3.0.0.

What and why

Play Console reports IllegalArgumentException: Key "2" was already used (and "3") from a LazyColumn. The cause is in 2.3.1 and in the 3.0.0 code.

• Tasks: the screen combined two Room queries, one for open tasks and one for done tasks, into one state. When a task was checked or unchecked, one query could emit before the other, so for a moment the task was in both lists. Both lists are keyed by task id, so the list crashed. Both lists now come from one query (getAllTasks), split with partition. Done tasks are still sorted newest first.
• A hidden tag's notes: the same race existed between the tag's live notes and its archived notes when a note was archived or unarchived. NotesDao.getArchivedNotesByTagId is replaced by getNotesOfTagWithArchived, one query, and the filter moves into ObserveNotesUseCase.

How it was tested

• :shared:desktopTest for the tasks, notes list and repository tests (TasksViewModelTest 18/18), and :core:database:testAndroidHostTest (NotesDaoTest 19/19)
• :core:database:updateKotlinAbi and :shared:updateKotlinAbi, dumps committed
• Checked on a device / emulator

Not verified:

• The new aTaskBeingCheckedOrUncheckedIsNeverInBothListsAtOnce test also passes without the fix. The test repository derives both lists from one StateFlow, so it cannot reproduce Room's separate query emissions. The fix comes from reading one query. The test only pins the behaviour.
• The crash was not reproduced on a device.

Security and data checklist

• No new permission, and in particular no INTERNET permission.
• No network, analytics, telemetry or proprietary (Google Play Services) dependency.
• No new path that puts plaintext outside the vault.
• No change to key derivation, the SQLCipher passphrase, the vault slots or any on-disk format.
• No Room schema change (a new query, no new table or column).
• User-visible change is listed under 3.0.0 / Fixed in CHANGELOG.md.