Do not show mobile menu on no categories

[ilyatitovich]

Fixes #178

1. Added API in core for display mobile menu;
2. Code handles open/close menu moved to core from template;
3. Added tests.

Motivation

Improve UX.

I suggest to open menu when user navigate to /slow, /fast and /add routes, so I added subscription to router. Also we can add check is mobile and handle calculation only if it's narrow screen. I would like to discuss it.

[github-actions[bot]]

Pull request auto-reviewer

• Think about code testing.

• Think about moving code to core/. What code will also be useful on other platforms?

• Think about HTML semantics.

• Think about accessibility. Try to search for a11y recommendations for your case. Think about how screen reader users will use the tool. Is it easy to use on a screen with bad contrast?

• The UI was checked in Chrome and Firefox (and Safari or Epiphany if you have them).

• Think about making types more precise. Can you better explain data relations by type?

[github-actions[bot]]

Pull request auto-reviewer

• Don’t rush. Check all changes in PR again.
• Run pnpm test.
• Think about changing documentation.
  • If you added a script to scripts/, add a comment with a description.
  • If you added a new folder, add its description to the project’s README.md.
  • If you added config, describe how we use this tool in the config’s comment.
  • Try to focus on “why?”, not “how?”.

[ilyatitovich]

1. Removed stores;
2. Moved the logic to openMenu();
3. Added a dynamic function substitution to the template so that it wouldn't run twice (when clicking and navigating).

[ai]

I am planning to start refactoring, so I am merging it (I will fix small changes)