fix: Android widget cold start crash and routing failure

[Apprentice2907]

Description

Fixed Android widget crash and routing failure on cold start (app fully closed).

The widget was using PendingIntent.getBroadcast() to handle button clicks,
which is blocked on Android 12+ when starting activities from background
receivers. Additionally, deep link routing was not handled for cold starts.

Also fixed the following build errors:

• Sentences class was abstract and could not be instantiated directly —
  fixed by using SentenceManager with the current app language
• Routes.TASKSERVER_SETUP did not exist — replaced with the correct
  route Routes.MANAGE_TASK_SERVER
• task.depends getter was missing on TaskForReplica model —
  added the field with proper fromJson, toJson and copyWith support

Fixes #594

Screenshots

Checklist

• Tests have been added or updated to cover the changes
• Documentation has been updated to reflect the changes
• Code follows the established coding style guidelines
• All tests are passing