Fix error for null namespace and use pinia

[C-Loftus]

Refactors to use the composition API and pinia. No visual / template code is different, just state logic.

• instead of having refs that need to be emitted to the parent, we can use a store. This allows us to access certain variables that are relevant to multiple components that would otherwise be awkward to pass around
  • pinia has a lot of nice features and allows us to just v-model directly with the store value
• uses the composition API to clean up the code a bit more

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