feat(app): show goals on tasks and unify bottom nav

[kodjima33]

Summary

• show goals row on tasks page (including empty state) and allow task→goal linking with local cache fallback
• add shared BottomNavBar widget and reuse it on home + chat
• tighten chat input spacing and hide center mic button on chat nav

Test plan

• ./test.sh (app)
• Manual: verify chat input spacing and bottom nav appearance

[gemini-code-assist]

Code Review

This pull request adds a swipe-right-to-indent feature for top-level tasks on mobile. The implementation correctly uses a Dismissible widget with a confirmDismiss callback to handle the new gesture without dismissing the item. My review found one area for improvement: there is a redundant conditional check in the onDismissed callback. Since onDismissed is only triggered for directions where confirmDismiss returns true, the check is unnecessary and can be removed to make the code cleaner and more robust.

[gemini-code-assist]

The if (direction == DismissDirection.endToStart) check is redundant. The onDismissed callback is only triggered when confirmDismiss returns true. In your implementation, this only happens for the endToStart direction because confirmDismiss returns false for startToEnd. Therefore, onDismissed will not be called for the startToEnd direction. You can safely remove the conditional check to make the code cleaner and more robust against future changes to confirmDismiss.

          _deleteTask(item);