Add code editor setting dropdowns (#36534)

Adds three `<select>` controls on top right for indent style, indent
size, and line wrap to the code editor (`_edit`), diff patch editor
(`_diffpatch`) and git hook editor (`/settings/hooks/git/pre-receive`).

The git hooks editor is restyled to wrap the content in a box. Also
included is a bugfix for the git hooks editor where monaco was not
initialized correctly.

---------

Signed-off-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

tailwind.config.ts

@@ -80,10 +80,10 @@ export default {
       semibold: 'var(--font-weight-semibold)',
       bold: 'var(--font-weight-bold)',
     },
-    fontSize: { // not using `rem` units because our root is currently 14px
-      'xs': '12px',
-      'sm': '14px',
-      'base': '16px',
+    fontSize: { // rarely used, but "text-base" (matching body's 1em=14px) is useful to reset font-size in a header container
+      'xs': '11px',
+      'sm': '12px',
+      'base': '14px',
       'lg': '18px',
       'xl': '20px',
       '2xl': '24px',