Updates to Text Descriptions Sidebar

[NateLanza]

Does this PR close any open issues?

Closes #373

Give a longer description of what this PR addresses and why it's needed

• Implements UI changes for the text description sidebar based on meeting, including defaulting to the user-provided description in all cases
• Fixes bug where saved plot information wouldn't load from a multinet state

Provide pictures/videos of the behavior before and after these changes (optional)

Have you added or updated relevant tests?

• Yes
• Not yet
• No changes are needed

Have you added or updated relevant documentation?

• Yes
• No changes are needed

Are there any additional TODOs before this PR is ready to go?

TODOs:

• Review from Daniel
• Review from team
• Tests
• Update this PR

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