Problems: auto-fix & problem panel (#541)

Test cases:
- [x] create-ts-errors
  - [x] with auto-fix
  - [x] without auto-fix 
- [x] create-unfixable-ts-errors
- [x] manually edit file & click recheck
- [x] fix all
- [x] delete and rename case

THINGS
- [x] error handling for checkProblems isn't working as expected
- [x] make sure it works for both default templates (add tests) 
- [x] fix bad animation
- [x] change file context (prompt/files)

IF everything passes in Windows AND defensive try catch... then enable
by default
- [x] enable auto-fix by default

src/main/settings.ts

@@ -20,6 +20,7 @@ const DEFAULT_SETTINGS: UserSettings = {
   enableProLazyEditsMode: true,
   enableProSmartFilesContextMode: true,
   selectedChatMode: "build",
+  enableAutoFixProblems: true,
 };
 
 const SETTINGS_FILE = "user-settings.json";