chore: Format the codebase with oxfmt and check formatting in CI (#135)

Run oxfmt once over the whole repository (formatting only, no logic changes) and add `pnpm format:check` to the frontend CI job so unformatted code no longer builds up. `.oxfmtrc.json` now skips the generated theme docs, test fixtures and code blocks inside Markdown.

Co-authored-by: jaw52 <[email protected]>

src/features/debugger/ui/DebugToolWindow.module.css

@@ -237,7 +237,7 @@
   white-space: pre-wrap;
   word-break: break-word;
   -webkit-user-select: text;
-cursor: text;
+  cursor: text;
   -webkit-user-select: text;
   user-select: text;
   outline: none;