fix: remove double-border on TopBar environment slot

The .env wrapper had its own border/background/padding which caused a
nested border appearance when wrapping a Select component. Simplified
to a plain flex container — the child component handles its own styling.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@cameleer/design-system",
-  "version": "0.1.40",
+  "version": "0.1.42",
   "type": "module",
   "main": "./dist/index.es.js",
   "module": "./dist/index.es.js",

src/design-system/layout/TopBar/TopBar.module.css

@@ -155,17 +155,6 @@
 .env {
   display: flex;
   align-items: center;
-  height: 30px;
-  padding: 4px 10px;
-  border: 1px solid var(--border);
-  border-radius: var(--radius-sm);
-  background: var(--bg-raised);
-  color: var(--text-muted);
-  font-family: var(--font-mono);
-  font-size: 12px;
-  font-weight: 600;
-  text-transform: uppercase;
-  letter-spacing: 0.5px;
 }
 
 .user {

src/design-system/primitives/Spinner/Spinner.module.css

@@ -5,3 +5,8 @@
   border-radius: 50%;
   animation: spin 0.6s linear infinite;
 }
+
+@keyframes spin {
+  from { transform: rotate(0deg); }
+  to   { transform: rotate(360deg); }
+}