Achieve full test coverage

[alanplotko]

This includes general app usage and building characters.

[alanplotko]

Blocked by #29, will need to resolve current snapshots first. The snapshots are outdated due Theme-related components wrapping around the components we want to test against and capture in snapshots. Enzyme's shallow API also no longer shows some same-level child components, e.g. the Note's "last attempted" timestamp for error-type notes does not show without diving or using shallow again on the wrapper.

Additionally, some components are renamed in newer snapshots to "ThemedComponent" despite not being made themable.

[alanplotko]

Blocked by #29, will need to resolve current snapshots first. The snapshots are outdated due Theme-related components wrapping around the components we want to test against and capture in snapshots. Enzyme's shallow API also no longer shows some same-level child components, e.g. the Note's "last attempted" timestamp for error-type notes does not show without diving or using shallow again on the wrapper.

Additionally, some components are renamed in newer snapshots to "ThemedComponent" despite not being made themable.

This has been sorted out in recent commits by updating the tests to dive 1-2 levels past the theme wrapper and reference elements by ThemedComponent[attribute="value"] instead. This pattern can be changed after theming is redone.