feat(dApps): Fine-tune dAppsListPopup

[alexjba]

What does the PR do

Changes:

1. Updating alignments
2. Adding scrolling effects
3. Updating storybook page

Affected areas

DApps

Screenshot of functionality (including design for comparison)

https://github.com/status-im/status-desktop/assets/47811206/70d18353-c83e-412f-9f81-2b35906abac9

• [x] I've checked the design and this PR matches it

Impact on end user

UX improvements

How to test

Storybook: Open DAppsComboBoxPage

App: Enable FLAG_DAPPS_ENABLED=1 Open dApps combo box from wallet header

Risk

Described potential risks and worst case scenarios.

Tick one:

• [x] Low risk: 2 devs MUST perform testing as specified above and attach their results as comments to this PR before merging.
• [ ] High risk: QA team MUST perform additional testing in the specified affected areas before merging.