Fix: Various small bugs found during typing updates (#14593)

* Fix: match Apple Mail tag colors case-insensitively

* Fix: reject OAuth callbacks with an unrecognized scope

* Fix: refuse to refresh OAuth tokens for non-OAuth accounts or missing refresh tokens

* Fix: parse datetime strings in the format_datetime filter and reject invalid ones

* Fix: reject a PAPERLESS_URL without a hostname

* Fix: report a database error in the system status instead of failing with a 500

* Fix: surface the database error when refreshing a document before moving its files

* Fix: report no unapplied migrations when the applied migrations cannot be read

* Fix: return the parsed value directly in format_datetime for typing

* Chore: annotate the paperless_dirs fixture in the refresh failure test

* Allow null for the latest_migration system status type

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src-ui/src/app/data/system-status.ts

@@ -24,7 +24,7 @@ export interface SystemStatus {
     status: SystemStatusItemStatus
     error?: string
     migration_status: {
-      latest_migration: string
+      latest_migration: string | null
       unapplied_migrations: string[]
     }
   }