Charcoal Outline: remove inner focus outline on message input

Clicking into the message box showed a blue outline around the text
field in addition to the outer container border. The global
:focus-visible rule was applying to the inner input element.

Notes:
- Added a rule that clears outline and box-shadow on focused
  descendants of the textarea outer row and the message search bar.
- The outer container keeps its single blue border via the existing
  :focus-within rule.
- Not yet verified in a live Fluxer session; the inner input class
  names are assumed from the existing selectors.

clarth/charcoal outline/theme.css

@@ -364,6 +364,18 @@ html, body {
   border-color: var(--co-accent);
 }
 
+:is(
+  [class*='TextareaInput.module__textareaOuterRow___'],
+  [class*='MessageSearchBar.module__inputContainer___']
+) *:focus,
+:is(
+  [class*='TextareaInput.module__textareaOuterRow___'],
+  [class*='MessageSearchBar.module__inputContainer___']
+) *:focus-visible {
+  outline: none !important;
+  box-shadow: none !important;
+}
+
 [class*='MessageSearchBar.module__scopeBadge___'] {
   background: var(--co-hover);
   color: var(--co-muted);