style(editor): scope the float responsive :global to .container (#145 review)

Per review: the file's other :global is locally scoped (.container:global(...)),
but the new float-reset media rule was fully global in a *.module.css. Scope it to
.container — the image node-view container carries BOTH the .container class and
the data-image-align attribute (same element), so behavior is unchanged while the
selector no longer leaks globally.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/client/src/features/editor/components/common/node-resize.module.css

@@ -81,8 +81,8 @@
    the image node view mirrors onto its container. This module is the one actually
    imported by the resize node views (node-resize-handles.ts), so the rule loads. */
 @media (max-width: 600px) {
-  :global([data-image-align="floatLeft"]),
-  :global([data-image-align="floatRight"]) {
+  .container:global([data-image-align="floatLeft"]),
+  .container:global([data-image-align="floatRight"]) {
     float: none !important;
     width: 100% !important;
     padding: 0 !important;