PM-27202: Update ItemListingScreen layout for improved spacing

[david-livefront]

🎟️ Tracking

PM-27202

📔 Objective

This PR updates the ItemListingScreen in order to apply the correct spacing between elements. Additionally, I made the expanding headers uppercase to match generic headers.

📸 Screenshots

Before	After

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 34ec211b-d1f3-4c8a-b4e2-d5dc004fae51

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.23%. Comparing base (ae4b398) to head (7216094).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...enticator/feature/itemlisting/ItemListingScreen.kt	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6065      +/-   ##
==========================================
- Coverage   84.79%   84.23%   -0.56%     
==========================================
  Files         720      836     +116     
  Lines       54957    57353    +2396     
  Branches     7636     7683      +47     
==========================================
+ Hits        46601    48313    +1712     
- Misses       5684     6353     +669     
- Partials     2672     2687      +15     

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[david-livefront]

Thanks @SaintPatrck