Previously, if a theme specified in the user's settings was not found, the CLI would crash during startup. This was particularly affecting users upgrading from older versions as the "ANSI colors only" theme was renamed to "ANSI".
This commit adds error handling to catch the theme not found error during initial loading and when setting themes later. Instead of crashing, the application now logs a warning, displays an error message in the UI, and opens the theme selection dialog to allow the user to choose a valid theme.
- Added a number of common themes to our support matrix:
- AtomOneDark
- Dracula
- VS
- GitHub
- GoogleCode
- XCode
- ... Admittedly these all were randomly picked, we could probably curate these better...
- Added a new `ThemeDialog` UI that can be accessed via `/theme`. It shows your currentlyt available themes and allows you to change them freely. It does **not**:
- Save the theme between sessions
- Allow you to hit escape
- Show a preview prior to selection.
- These themes are from reacts highlight js library.
Fixes https://b.corp.google.com/issues/412797985
