Group the stylesheet import lists by component stream

tailwind.css and components.css now hold one block per audit group, and the new
layout.css gathers the layout components, so the parallel rewrites of plan steps
35 and 36 each edit their own lines. .browser-lock is the lock that keeps those
streams to one browser at a time.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

resources/css/components.css

@@ -2,10 +2,19 @@
  * The component stylesheets already written without Tailwind (plan step 36), while the rest are
  * still in tailwind.css. Each lives in `material.components`, so it can be imported anywhere in
  * the entry: the layer statement, not the import order, decides where its rules rank. Step 37
- * replaces this file with all.css.
+ * replaces this file with all.css. One block per stream, so parallel rewrites merge cleanly.
  */
 
 @layer material.reset, material.tokens, material.base, material.layout, material.components, material.text, material.visibility;
 
+/* Foundation components */
 @import './components/icon.css';
 @import './components/shape.css';
+
+/* Actions and communication */
+
+/* Inputs, selection and data */
+
+/* Containment */
+
+/* Navigation */