Fix UI padding and text flush against container edges

- Remove global * { padding: 0 } reset that was overriding all Tailwind
  padding classes (unlayered CSS beats Tailwind v4 @layer utilities)
- Add color-scheme: dark to fix native form controls (select dropdowns)
  rendering with white backgrounds
- Make sidebar responsive (25% width, min 224px, max 320px)
- Increase internal padding on TopBar, Sidebar, ProjectList, StatusBar
- Add flex-shrink-0 to TopBar status indicators to prevent clipping
- Allow project action buttons to wrap on narrow sidebars
- Increase terminal view padding for breathing room

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/components/layout/StatusBar.tsx

@@ -5,7 +5,7 @@ export default function StatusBar() {
   const running = projects.filter((p) => p.status === "running").length;
 
   return (
-    <div className="flex items-center h-6 px-3 bg-[var(--bg-tertiary)] border border-[var(--border-color)] rounded-lg text-xs text-[var(--text-secondary)]">
+    <div className="flex items-center h-6 px-4 bg-[var(--bg-tertiary)] border border-[var(--border-color)] rounded-lg text-xs text-[var(--text-secondary)]">
       <span>
         {projects.length} project{projects.length !== 1 ? "s" : ""}
       </span>