Side navigation app title clickable area expansion

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## Summary
Increase the size of the app title clickable area to fill the top section of top nav.

## 💬 Description
The app title show its clickable area idented from the edges using a set margin. However, all other clickable buttons in the side nav span the full width and height of the container.

To attain consistency, we should update the app title to follow this same pattern.

## 💰 Use value
Consistent approach to interaction areas will remove chance of error when trying to click the buttons within the side navigation.

## 📝 Acceptance Criteria
If relevant, describe in full detail the different interactions and edge cases that the component or patterns needs to fulfil.

*Given* that a side navigation exists with a clickable app-title
*When* interactiving the the app-title button
*Then* the interaction area should fill the side nav in same way as other side nav buttons.

## ✏ Designs
If there's a Figma design file (or other mock-up), include it here.

## 🧾 Guidance
If there's written guidance or documentation, include a link to it here.

## Additional info
Tell us anything else useful to help us understand your suggestion.

Inspect the side navigation app-title component and compare its clickable container with the other side navigation buttons. Verify the app title interaction area fills the same width and height as the surrounding navigation controls, then confirm the behavior against the acceptance criteria.

Written by the indexing model from the issue text.