feat(lightning): refine Create/Join modal UI

[LavinaFand21]

PR Description: UI Improvements for Create / Join LN Module

This PR focuses on refining the Create/Join LN flow to improve usability, consistency, and alignment with the existing theme.

• General Changes:

1. Updated the UI of the Create/Join LN module to better align with the overall product theme.
2. Dynamic heading update: switches between Create LN and Join LN based on the selected tab.
3. Updated descriptive text under the heading for each flow individually.
4. Ensured consistent layout dimensions while switching between Create and Join tabs.

• Create LN:

1. Updated tab headings for better clarity.
2. Added a dropdown with a preselected value (similar to the token selector).
3. Improved error handling and error messaging.
4. Implemented automatic screen sliding when errors appear to maintain layout and visibility.

• Join LN:

1. Removed unnecessary tabs to simplify the flow.
2. Removed the Scan QR Code option.
3. Enhanced error handling and messaging.
4. Maintained consistent screen dimensions when switching between Create and Join flows.

These changes aim to make the LN onboarding flow more minimal, intuitive, and user-friendly.

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