Fix History Bugs

[RomneyDa]

Description

Fixes history bugs:

• Not persisting edits properly and not updating minisearch on edit/delete
• repeatedly updating chat title for current chat because state.title wasn't being updated

Also reorders json keys for more readable session files

Also changed some type names for better readability:

• PersistedSessionInfo -> Session
• SessionInfo -> SessionMetadata

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[RomneyDa]

Fixes #2984