Make Persistent Menu Navigation a Sidebar

[AddisonDunn]

Product Description

Jira: one and two.

This PR:

• Turns the persistent menu navigation into a sidebar when on desktop, but remaining an overlay on mobile
• To accomplish the bullet above, I needed to "lock" the main content container, so that scrolling happens on the content container instead of the entire page. This way the persistent menu and the other content can be separately scrollable.
• Removes the data preview bar on mobile
• Removes the gray background around forms on mobile

To see what I mean by "locked" and "separately scrollable", see this video:
https://github.com/user-attachments/assets/eed7edaf-1036-4fb0-a705-16e4f3847a57

Gray background removed on mobile:

Technical Summary

I made some key changes to margins and the underlying DOM layout of web apps that I am hoping will be more of a boon than a burden.

Safety Assurance

Safety story

• Everything looks good with testing locally: main app selection screen, case list screen with case tiles and map, form screen
• This will go through QA

QA Plan

Going to go through QA, ticket TBD

Rollback instructions

• This PR can be reverted after deploy with no further considerations

Labels & Review

• Risk label is set correctly
• The set of people pinged as reviewers is appropriate for the level of risk of the change