refactor: Merge appbar and body files into page

[riscait]

🙌 What's Done

• Merge appbar and body files into page
• Delete unused files

✍️ What's Not Done

🖼️ Image Differences

Before	After
image	image

🤼 Desired Review Method

• Correction Commit
• Pair programming

Note

It is possible that a reviewer's will may cause a method to be implemented that is not selected.

📝 Additional Notes

Pre-launch Checklist

• I have reviewed my own code.
• I have added tests that prove my fix is effective or that my feature works.
• I updated/added relevant documentation (doc comments with ///).

[riscait]

We created a more powerful chat_ui package in another project, so this one is unnecessary.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.75%. Comparing base (bc5eb7e) to head (8824288).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #488   +/-   ##
=======================================
  Coverage   23.75%   23.75%           
=======================================
  Files          13       13           
  Lines         160      160           
=======================================
  Hits           38       38           
  Misses        122      122           

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[riscait]

Unused page files.

[naipaka]