Apply filter configuration to problem feature

[Gabbar-v7]

This pull request updates the way the "List" button on the Problems page filters problem status based on user configuration. The main change is to allow the button to pass the user's preferred status filter (such as "ac", "notac", or "todo") when listing problems. This required updating both the configuration template and the button's behavior.

User status filter integration:

• Added a new status field to the leetcode.config template, allowing users to specify their preferred problem status filter (e.g., "ac", "notac", "todo", or nil).
• Modified the "List" button in problems.lua so that when pressed, it calls cmd.problems with the user's configured status filter.
• Included the leetcode.config module in problems.lua to access the user's status configuration.

[Gabbar-v7]

This is just a mock implementation. I can raise a proper production PR if you could guide me.