infra: add linting and formatting for js projects (#230)

* wip

* wip

* wip

* format

* wip(mobile): lint and format

* cleanup

* nits

* nits

* idiomatic react

* nit

* format all root files

js/desktop/src/features/compose/markdown-editor.css

@@ -36,8 +36,9 @@
   /* Use the application font, not Crepe's bundled Noto Sans / Noto Serif. */
   --crepe-font-default: inherit;
   --crepe-font-title: inherit;
-  --crepe-font-code: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
-    "Liberation Mono", monospace;
+  --crepe-font-code:
+    ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono',
+    monospace;
 }
 
 /* Glassy floating menus over content. */